snapshot of https://github.com/ent/ent.git (master, 2026-09-15; blobs > 131072B omitted)

examples/traversal/README.md

@@ -0,0 +1,15 @@
+# Graph Traversal Example
+
+See example in https://entgo.io/docs/traversals
+
+### Generate Assets
+
+```console
+go generate ./...
+```
+
+### Run Examples
+
+```console
+go test
+```

examples/traversal/ent/client.go

@@ -0,0 +1,759 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log"
+	"reflect"
+
+	"entgo.io/ent"
+	"entgo.io/ent/examples/traversal/ent/migrate"
+
+	"entgo.io/ent/dialect"
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/group"
+	"entgo.io/ent/examples/traversal/ent/pet"
+	"entgo.io/ent/examples/traversal/ent/user"
+)
+
+// Client is the client that holds all ent builders.
+type Client struct {
+	config
+	// Schema is the client for creating, migrating and dropping schema.
+	Schema *migrate.Schema
+	// Group is the client for interacting with the Group builders.
+	Group *GroupClient
+	// Pet is the client for interacting with the Pet builders.
+	Pet *PetClient
+	// User is the client for interacting with the User builders.
+	User *UserClient
+}
+
+// NewClient creates a new client configured with the given options.
+func NewClient(opts ...Option) *Client {
+	client := &Client{config: newConfig(opts...)}
+	client.init()
+	return client
+}
+
+func (c *Client) init() {
+	c.Schema = migrate.NewSchema(c.driver)
+	c.Group = NewGroupClient(c.config)
+	c.Pet = NewPetClient(c.config)
+	c.User = NewUserClient(c.config)
+}
+
+type (
+	// config is the configuration for the client and its builder.
+	config struct {
+		// driver used for executing database requests.
+		driver dialect.Driver
+		// debug enable a debug logging.
+		debug bool
+		// log used for logging on debug mode.
+		log func(...any)
+		// hooks to execute on mutations.
+		hooks *hooks
+		// interceptors to execute on queries.
+		inters *inters
+	}
+	// Option function to configure the client.
+	Option func(*config)
+)
+
+// newConfig creates a new config for the client.
+func newConfig(opts ...Option) config {
+	cfg := config{log: log.Println, hooks: &hooks{}, inters: &inters{}}
+	cfg.options(opts...)
+	return cfg
+}
+
+// options applies the options on the config object.
+func (c *config) options(opts ...Option) {
+	for _, opt := range opts {
+		opt(c)
+	}
+	if c.debug {
+		c.driver = dialect.Debug(c.driver, c.log)
+	}
+}
+
+// Debug enables debug logging on the ent.Driver.
+func Debug() Option {
+	return func(c *config) {
+		c.debug = true
+	}
+}
+
+// Log sets the logging function for debug mode.
+func Log(fn func(...any)) Option {
+	return func(c *config) {
+		c.log = fn
+	}
+}
+
+// Driver configures the client driver.
+func Driver(driver dialect.Driver) Option {
+	return func(c *config) {
+		c.driver = driver
+	}
+}
+
+// Open opens a database/sql.DB specified by the driver name and
+// the data source name, and returns a new client attached to it.
+// Optional parameters can be added for configuring the client.
+func Open(driverName, dataSourceName string, options ...Option) (*Client, error) {
+	switch driverName {
+	case dialect.MySQL, dialect.Postgres, dialect.SQLite:
+		drv, err := sql.Open(driverName, dataSourceName)
+		if err != nil {
+			return nil, err
+		}
+		return NewClient(append(options, Driver(drv))...), nil
+	default:
+		return nil, fmt.Errorf("unsupported driver: %q", driverName)
+	}
+}
+
+// ErrTxStarted is returned when trying to start a new transaction from a transactional client.
+var ErrTxStarted = errors.New("ent: cannot start a transaction within a transaction")
+
+// Tx returns a new transactional client. The provided context
+// is used until the transaction is committed or rolled back.
+func (c *Client) Tx(ctx context.Context) (*Tx, error) {
+	if _, ok := c.driver.(*txDriver); ok {
+		return nil, ErrTxStarted
+	}
+	tx, err := newTx(ctx, c.driver)
+	if err != nil {
+		return nil, fmt.Errorf("ent: starting a transaction: %w", err)
+	}
+	cfg := c.config
+	cfg.driver = tx
+	return &Tx{
+		ctx:    ctx,
+		config: cfg,
+		Group:  NewGroupClient(cfg),
+		Pet:    NewPetClient(cfg),
+		User:   NewUserClient(cfg),
+	}, nil
+}
+
+// BeginTx returns a transactional client with specified options.
+func (c *Client) BeginTx(ctx context.Context, opts *sql.TxOptions) (*Tx, error) {
+	if _, ok := c.driver.(*txDriver); ok {
+		return nil, errors.New("ent: cannot start a transaction within a transaction")
+	}
+	tx, err := c.driver.(interface {
+		BeginTx(context.Context, *sql.TxOptions) (dialect.Tx, error)
+	}).BeginTx(ctx, opts)
+	if err != nil {
+		return nil, fmt.Errorf("ent: starting a transaction: %w", err)
+	}
+	cfg := c.config
+	cfg.driver = &txDriver{tx: tx, drv: c.driver}
+	return &Tx{
+		ctx:    ctx,
+		config: cfg,
+		Group:  NewGroupClient(cfg),
+		Pet:    NewPetClient(cfg),
+		User:   NewUserClient(cfg),
+	}, nil
+}
+
+// Debug returns a new debug-client. It's used to get verbose logging on specific operations.
+//
+//	client.Debug().
+//		Group.
+//		Query().
+//		Count(ctx)
+func (c *Client) Debug() *Client {
+	if c.debug {
+		return c
+	}
+	cfg := c.config
+	cfg.driver = dialect.Debug(c.driver, c.log)
+	client := &Client{config: cfg}
+	client.init()
+	return client
+}
+
+// Close closes the database connection and prevents new queries from starting.
+func (c *Client) Close() error {
+	return c.driver.Close()
+}
+
+// Use adds the mutation hooks to all the entity clients.
+// In order to add hooks to a specific client, call: `client.Node.Use(...)`.
+func (c *Client) Use(hooks ...Hook) {
+	c.Group.Use(hooks...)
+	c.Pet.Use(hooks...)
+	c.User.Use(hooks...)
+}
+
+// Intercept adds the query interceptors to all the entity clients.
+// In order to add interceptors to a specific client, call: `client.Node.Intercept(...)`.
+func (c *Client) Intercept(interceptors ...Interceptor) {
+	c.Group.Intercept(interceptors...)
+	c.Pet.Intercept(interceptors...)
+	c.User.Intercept(interceptors...)
+}
+
+// Mutate implements the ent.Mutator interface.
+func (c *Client) Mutate(ctx context.Context, m Mutation) (Value, error) {
+	switch m := m.(type) {
+	case *GroupMutation:
+		return c.Group.mutate(ctx, m)
+	case *PetMutation:
+		return c.Pet.mutate(ctx, m)
+	case *UserMutation:
+		return c.User.mutate(ctx, m)
+	default:
+		return nil, fmt.Errorf("ent: unknown mutation type %T", m)
+	}
+}
+
+// GroupClient is a client for the Group schema.
+type GroupClient struct {
+	config
+}
+
+// NewGroupClient returns a client for the Group from the given config.
+func NewGroupClient(c config) *GroupClient {
+	return &GroupClient{config: c}
+}
+
+// Use adds a list of mutation hooks to the hooks stack.
+// A call to `Use(f, g, h)` equals to `group.Hooks(f(g(h())))`.
+func (c *GroupClient) Use(hooks ...Hook) {
+	c.hooks.Group = append(c.hooks.Group, hooks...)
+}
+
+// Intercept adds a list of query interceptors to the interceptors stack.
+// A call to `Intercept(f, g, h)` equals to `group.Intercept(f(g(h())))`.
+func (c *GroupClient) Intercept(interceptors ...Interceptor) {
+	c.inters.Group = append(c.inters.Group, interceptors...)
+}
+
+// Create returns a builder for creating a Group entity.
+func (c *GroupClient) Create() *GroupCreate {
+	mutation := newGroupMutation(c.config, OpCreate)
+	return &GroupCreate{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// CreateBulk returns a builder for creating a bulk of Group entities.
+func (c *GroupClient) CreateBulk(builders ...*GroupCreate) *GroupCreateBulk {
+	return &GroupCreateBulk{config: c.config, builders: builders}
+}
+
+// MapCreateBulk creates a bulk creation builder from the given slice. For each item in the slice, the function creates
+// a builder and applies setFunc on it.
+func (c *GroupClient) MapCreateBulk(slice any, setFunc func(*GroupCreate, int)) *GroupCreateBulk {
+	rv := reflect.ValueOf(slice)
+	if rv.Kind() != reflect.Slice {
+		return &GroupCreateBulk{err: fmt.Errorf("calling to GroupClient.MapCreateBulk with wrong type %T, need slice", slice)}
+	}
+	builders := make([]*GroupCreate, rv.Len())
+	for i := 0; i < rv.Len(); i++ {
+		builders[i] = c.Create()
+		setFunc(builders[i], i)
+	}
+	return &GroupCreateBulk{config: c.config, builders: builders}
+}
+
+// Update returns an update builder for Group.
+func (c *GroupClient) Update() *GroupUpdate {
+	mutation := newGroupMutation(c.config, OpUpdate)
+	return &GroupUpdate{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// UpdateOne returns an update builder for the given entity.
+func (c *GroupClient) UpdateOne(_m *Group) *GroupUpdateOne {
+	mutation := newGroupMutation(c.config, OpUpdateOne, withGroup(_m))
+	return &GroupUpdateOne{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// UpdateOneID returns an update builder for the given id.
+func (c *GroupClient) UpdateOneID(id int) *GroupUpdateOne {
+	mutation := newGroupMutation(c.config, OpUpdateOne, withGroupID(id))
+	return &GroupUpdateOne{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// Delete returns a delete builder for Group.
+func (c *GroupClient) Delete() *GroupDelete {
+	mutation := newGroupMutation(c.config, OpDelete)
+	return &GroupDelete{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// DeleteOne returns a builder for deleting the given entity.
+func (c *GroupClient) DeleteOne(_m *Group) *GroupDeleteOne {
+	return c.DeleteOneID(_m.ID)
+}
+
+// DeleteOneID returns a builder for deleting the given entity by its id.
+func (c *GroupClient) DeleteOneID(id int) *GroupDeleteOne {
+	builder := c.Delete().Where(group.ID(id))
+	builder.mutation.id = &id
+	builder.mutation.SetOp(OpDeleteOne)
+	return &GroupDeleteOne{builder}
+}
+
+// Query returns a query builder for Group.
+func (c *GroupClient) Query() *GroupQuery {
+	return &GroupQuery{
+		config: c.config,
+		ctx:    &QueryContext{Type: TypeGroup},
+		inters: c.Interceptors(),
+	}
+}
+
+// Get returns a Group entity by its id.
+func (c *GroupClient) Get(ctx context.Context, id int) (*Group, error) {
+	return c.Query().Where(group.ID(id)).Only(ctx)
+}
+
+// GetX is like Get, but panics if an error occurs.
+func (c *GroupClient) GetX(ctx context.Context, id int) *Group {
+	obj, err := c.Get(ctx, id)
+	if err != nil {
+		panic(err)
+	}
+	return obj
+}
+
+// QueryUsers queries the users edge of a Group.
+func (c *GroupClient) QueryUsers(_m *Group) *UserQuery {
+	query := (&UserClient{config: c.config}).Query()
+	query.path = func(context.Context) (fromV *sql.Selector, _ error) {
+		id := _m.ID
+		step := sqlgraph.NewStep(
+			sqlgraph.From(group.Table, group.FieldID, id),
+			sqlgraph.To(user.Table, user.FieldID),
+			sqlgraph.Edge(sqlgraph.M2M, false, group.UsersTable, group.UsersPrimaryKey...),
+		)
+		fromV = sqlgraph.Neighbors(_m.driver.Dialect(), step)
+		return fromV, nil
+	}
+	return query
+}
+
+// QueryAdmin queries the admin edge of a Group.
+func (c *GroupClient) QueryAdmin(_m *Group) *UserQuery {
+	query := (&UserClient{config: c.config}).Query()
+	query.path = func(context.Context) (fromV *sql.Selector, _ error) {
+		id := _m.ID
+		step := sqlgraph.NewStep(
+			sqlgraph.From(group.Table, group.FieldID, id),
+			sqlgraph.To(user.Table, user.FieldID),
+			sqlgraph.Edge(sqlgraph.M2O, false, group.AdminTable, group.AdminColumn),
+		)
+		fromV = sqlgraph.Neighbors(_m.driver.Dialect(), step)
+		return fromV, nil
+	}
+	return query
+}
+
+// Hooks returns the client hooks.
+func (c *GroupClient) Hooks() []Hook {
+	return c.hooks.Group
+}
+
+// Interceptors returns the client interceptors.
+func (c *GroupClient) Interceptors() []Interceptor {
+	return c.inters.Group
+}
+
+func (c *GroupClient) mutate(ctx context.Context, m *GroupMutation) (Value, error) {
+	switch m.Op() {
+	case OpCreate:
+		return (&GroupCreate{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
+	case OpUpdate:
+		return (&GroupUpdate{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
+	case OpUpdateOne:
+		return (&GroupUpdateOne{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
+	case OpDelete, OpDeleteOne:
+		return (&GroupDelete{config: c.config, hooks: c.Hooks(), mutation: m}).Exec(ctx)
+	default:
+		return nil, fmt.Errorf("ent: unknown Group mutation op: %q", m.Op())
+	}
+}
+
+// PetClient is a client for the Pet schema.
+type PetClient struct {
+	config
+}
+
+// NewPetClient returns a client for the Pet from the given config.
+func NewPetClient(c config) *PetClient {
+	return &PetClient{config: c}
+}
+
+// Use adds a list of mutation hooks to the hooks stack.
+// A call to `Use(f, g, h)` equals to `pet.Hooks(f(g(h())))`.
+func (c *PetClient) Use(hooks ...Hook) {
+	c.hooks.Pet = append(c.hooks.Pet, hooks...)
+}
+
+// Intercept adds a list of query interceptors to the interceptors stack.
+// A call to `Intercept(f, g, h)` equals to `pet.Intercept(f(g(h())))`.
+func (c *PetClient) Intercept(interceptors ...Interceptor) {
+	c.inters.Pet = append(c.inters.Pet, interceptors...)
+}
+
+// Create returns a builder for creating a Pet entity.
+func (c *PetClient) Create() *PetCreate {
+	mutation := newPetMutation(c.config, OpCreate)
+	return &PetCreate{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// CreateBulk returns a builder for creating a bulk of Pet entities.
+func (c *PetClient) CreateBulk(builders ...*PetCreate) *PetCreateBulk {
+	return &PetCreateBulk{config: c.config, builders: builders}
+}
+
+// MapCreateBulk creates a bulk creation builder from the given slice. For each item in the slice, the function creates
+// a builder and applies setFunc on it.
+func (c *PetClient) MapCreateBulk(slice any, setFunc func(*PetCreate, int)) *PetCreateBulk {
+	rv := reflect.ValueOf(slice)
+	if rv.Kind() != reflect.Slice {
+		return &PetCreateBulk{err: fmt.Errorf("calling to PetClient.MapCreateBulk with wrong type %T, need slice", slice)}
+	}
+	builders := make([]*PetCreate, rv.Len())
+	for i := 0; i < rv.Len(); i++ {
+		builders[i] = c.Create()
+		setFunc(builders[i], i)
+	}
+	return &PetCreateBulk{config: c.config, builders: builders}
+}
+
+// Update returns an update builder for Pet.
+func (c *PetClient) Update() *PetUpdate {
+	mutation := newPetMutation(c.config, OpUpdate)
+	return &PetUpdate{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// UpdateOne returns an update builder for the given entity.
+func (c *PetClient) UpdateOne(_m *Pet) *PetUpdateOne {
+	mutation := newPetMutation(c.config, OpUpdateOne, withPet(_m))
+	return &PetUpdateOne{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// UpdateOneID returns an update builder for the given id.
+func (c *PetClient) UpdateOneID(id int) *PetUpdateOne {
+	mutation := newPetMutation(c.config, OpUpdateOne, withPetID(id))
+	return &PetUpdateOne{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// Delete returns a delete builder for Pet.
+func (c *PetClient) Delete() *PetDelete {
+	mutation := newPetMutation(c.config, OpDelete)
+	return &PetDelete{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// DeleteOne returns a builder for deleting the given entity.
+func (c *PetClient) DeleteOne(_m *Pet) *PetDeleteOne {
+	return c.DeleteOneID(_m.ID)
+}
+
+// DeleteOneID returns a builder for deleting the given entity by its id.
+func (c *PetClient) DeleteOneID(id int) *PetDeleteOne {
+	builder := c.Delete().Where(pet.ID(id))
+	builder.mutation.id = &id
+	builder.mutation.SetOp(OpDeleteOne)
+	return &PetDeleteOne{builder}
+}
+
+// Query returns a query builder for Pet.
+func (c *PetClient) Query() *PetQuery {
+	return &PetQuery{
+		config: c.config,
+		ctx:    &QueryContext{Type: TypePet},
+		inters: c.Interceptors(),
+	}
+}
+
+// Get returns a Pet entity by its id.
+func (c *PetClient) Get(ctx context.Context, id int) (*Pet, error) {
+	return c.Query().Where(pet.ID(id)).Only(ctx)
+}
+
+// GetX is like Get, but panics if an error occurs.
+func (c *PetClient) GetX(ctx context.Context, id int) *Pet {
+	obj, err := c.Get(ctx, id)
+	if err != nil {
+		panic(err)
+	}
+	return obj
+}
+
+// QueryFriends queries the friends edge of a Pet.
+func (c *PetClient) QueryFriends(_m *Pet) *PetQuery {
+	query := (&PetClient{config: c.config}).Query()
+	query.path = func(context.Context) (fromV *sql.Selector, _ error) {
+		id := _m.ID
+		step := sqlgraph.NewStep(
+			sqlgraph.From(pet.Table, pet.FieldID, id),
+			sqlgraph.To(pet.Table, pet.FieldID),
+			sqlgraph.Edge(sqlgraph.M2M, false, pet.FriendsTable, pet.FriendsPrimaryKey...),
+		)
+		fromV = sqlgraph.Neighbors(_m.driver.Dialect(), step)
+		return fromV, nil
+	}
+	return query
+}
+
+// QueryOwner queries the owner edge of a Pet.
+func (c *PetClient) QueryOwner(_m *Pet) *UserQuery {
+	query := (&UserClient{config: c.config}).Query()
+	query.path = func(context.Context) (fromV *sql.Selector, _ error) {
+		id := _m.ID
+		step := sqlgraph.NewStep(
+			sqlgraph.From(pet.Table, pet.FieldID, id),
+			sqlgraph.To(user.Table, user.FieldID),
+			sqlgraph.Edge(sqlgraph.M2O, true, pet.OwnerTable, pet.OwnerColumn),
+		)
+		fromV = sqlgraph.Neighbors(_m.driver.Dialect(), step)
+		return fromV, nil
+	}
+	return query
+}
+
+// Hooks returns the client hooks.
+func (c *PetClient) Hooks() []Hook {
+	return c.hooks.Pet
+}
+
+// Interceptors returns the client interceptors.
+func (c *PetClient) Interceptors() []Interceptor {
+	return c.inters.Pet
+}
+
+func (c *PetClient) mutate(ctx context.Context, m *PetMutation) (Value, error) {
+	switch m.Op() {
+	case OpCreate:
+		return (&PetCreate{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
+	case OpUpdate:
+		return (&PetUpdate{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
+	case OpUpdateOne:
+		return (&PetUpdateOne{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
+	case OpDelete, OpDeleteOne:
+		return (&PetDelete{config: c.config, hooks: c.Hooks(), mutation: m}).Exec(ctx)
+	default:
+		return nil, fmt.Errorf("ent: unknown Pet mutation op: %q", m.Op())
+	}
+}
+
+// UserClient is a client for the User schema.
+type UserClient struct {
+	config
+}
+
+// NewUserClient returns a client for the User from the given config.
+func NewUserClient(c config) *UserClient {
+	return &UserClient{config: c}
+}
+
+// Use adds a list of mutation hooks to the hooks stack.
+// A call to `Use(f, g, h)` equals to `user.Hooks(f(g(h())))`.
+func (c *UserClient) Use(hooks ...Hook) {
+	c.hooks.User = append(c.hooks.User, hooks...)
+}
+
+// Intercept adds a list of query interceptors to the interceptors stack.
+// A call to `Intercept(f, g, h)` equals to `user.Intercept(f(g(h())))`.
+func (c *UserClient) Intercept(interceptors ...Interceptor) {
+	c.inters.User = append(c.inters.User, interceptors...)
+}
+
+// Create returns a builder for creating a User entity.
+func (c *UserClient) Create() *UserCreate {
+	mutation := newUserMutation(c.config, OpCreate)
+	return &UserCreate{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// CreateBulk returns a builder for creating a bulk of User entities.
+func (c *UserClient) CreateBulk(builders ...*UserCreate) *UserCreateBulk {
+	return &UserCreateBulk{config: c.config, builders: builders}
+}
+
+// MapCreateBulk creates a bulk creation builder from the given slice. For each item in the slice, the function creates
+// a builder and applies setFunc on it.
+func (c *UserClient) MapCreateBulk(slice any, setFunc func(*UserCreate, int)) *UserCreateBulk {
+	rv := reflect.ValueOf(slice)
+	if rv.Kind() != reflect.Slice {
+		return &UserCreateBulk{err: fmt.Errorf("calling to UserClient.MapCreateBulk with wrong type %T, need slice", slice)}
+	}
+	builders := make([]*UserCreate, rv.Len())
+	for i := 0; i < rv.Len(); i++ {
+		builders[i] = c.Create()
+		setFunc(builders[i], i)
+	}
+	return &UserCreateBulk{config: c.config, builders: builders}
+}
+
+// Update returns an update builder for User.
+func (c *UserClient) Update() *UserUpdate {
+	mutation := newUserMutation(c.config, OpUpdate)
+	return &UserUpdate{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// UpdateOne returns an update builder for the given entity.
+func (c *UserClient) UpdateOne(_m *User) *UserUpdateOne {
+	mutation := newUserMutation(c.config, OpUpdateOne, withUser(_m))
+	return &UserUpdateOne{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// UpdateOneID returns an update builder for the given id.
+func (c *UserClient) UpdateOneID(id int) *UserUpdateOne {
+	mutation := newUserMutation(c.config, OpUpdateOne, withUserID(id))
+	return &UserUpdateOne{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// Delete returns a delete builder for User.
+func (c *UserClient) Delete() *UserDelete {
+	mutation := newUserMutation(c.config, OpDelete)
+	return &UserDelete{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// DeleteOne returns a builder for deleting the given entity.
+func (c *UserClient) DeleteOne(_m *User) *UserDeleteOne {
+	return c.DeleteOneID(_m.ID)
+}
+
+// DeleteOneID returns a builder for deleting the given entity by its id.
+func (c *UserClient) DeleteOneID(id int) *UserDeleteOne {
+	builder := c.Delete().Where(user.ID(id))
+	builder.mutation.id = &id
+	builder.mutation.SetOp(OpDeleteOne)
+	return &UserDeleteOne{builder}
+}
+
+// Query returns a query builder for User.
+func (c *UserClient) Query() *UserQuery {
+	return &UserQuery{
+		config: c.config,
+		ctx:    &QueryContext{Type: TypeUser},
+		inters: c.Interceptors(),
+	}
+}
+
+// Get returns a User entity by its id.
+func (c *UserClient) Get(ctx context.Context, id int) (*User, error) {
+	return c.Query().Where(user.ID(id)).Only(ctx)
+}
+
+// GetX is like Get, but panics if an error occurs.
+func (c *UserClient) GetX(ctx context.Context, id int) *User {
+	obj, err := c.Get(ctx, id)
+	if err != nil {
+		panic(err)
+	}
+	return obj
+}
+
+// QueryPets queries the pets edge of a User.
+func (c *UserClient) QueryPets(_m *User) *PetQuery {
+	query := (&PetClient{config: c.config}).Query()
+	query.path = func(context.Context) (fromV *sql.Selector, _ error) {
+		id := _m.ID
+		step := sqlgraph.NewStep(
+			sqlgraph.From(user.Table, user.FieldID, id),
+			sqlgraph.To(pet.Table, pet.FieldID),
+			sqlgraph.Edge(sqlgraph.O2M, false, user.PetsTable, user.PetsColumn),
+		)
+		fromV = sqlgraph.Neighbors(_m.driver.Dialect(), step)
+		return fromV, nil
+	}
+	return query
+}
+
+// QueryFriends queries the friends edge of a User.
+func (c *UserClient) QueryFriends(_m *User) *UserQuery {
+	query := (&UserClient{config: c.config}).Query()
+	query.path = func(context.Context) (fromV *sql.Selector, _ error) {
+		id := _m.ID
+		step := sqlgraph.NewStep(
+			sqlgraph.From(user.Table, user.FieldID, id),
+			sqlgraph.To(user.Table, user.FieldID),
+			sqlgraph.Edge(sqlgraph.M2M, false, user.FriendsTable, user.FriendsPrimaryKey...),
+		)
+		fromV = sqlgraph.Neighbors(_m.driver.Dialect(), step)
+		return fromV, nil
+	}
+	return query
+}
+
+// QueryGroups queries the groups edge of a User.
+func (c *UserClient) QueryGroups(_m *User) *GroupQuery {
+	query := (&GroupClient{config: c.config}).Query()
+	query.path = func(context.Context) (fromV *sql.Selector, _ error) {
+		id := _m.ID
+		step := sqlgraph.NewStep(
+			sqlgraph.From(user.Table, user.FieldID, id),
+			sqlgraph.To(group.Table, group.FieldID),
+			sqlgraph.Edge(sqlgraph.M2M, true, user.GroupsTable, user.GroupsPrimaryKey...),
+		)
+		fromV = sqlgraph.Neighbors(_m.driver.Dialect(), step)
+		return fromV, nil
+	}
+	return query
+}
+
+// QueryManage queries the manage edge of a User.
+func (c *UserClient) QueryManage(_m *User) *GroupQuery {
+	query := (&GroupClient{config: c.config}).Query()
+	query.path = func(context.Context) (fromV *sql.Selector, _ error) {
+		id := _m.ID
+		step := sqlgraph.NewStep(
+			sqlgraph.From(user.Table, user.FieldID, id),
+			sqlgraph.To(group.Table, group.FieldID),
+			sqlgraph.Edge(sqlgraph.O2M, true, user.ManageTable, user.ManageColumn),
+		)
+		fromV = sqlgraph.Neighbors(_m.driver.Dialect(), step)
+		return fromV, nil
+	}
+	return query
+}
+
+// Hooks returns the client hooks.
+func (c *UserClient) Hooks() []Hook {
+	return c.hooks.User
+}
+
+// Interceptors returns the client interceptors.
+func (c *UserClient) Interceptors() []Interceptor {
+	return c.inters.User
+}
+
+func (c *UserClient) mutate(ctx context.Context, m *UserMutation) (Value, error) {
+	switch m.Op() {
+	case OpCreate:
+		return (&UserCreate{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
+	case OpUpdate:
+		return (&UserUpdate{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
+	case OpUpdateOne:
+		return (&UserUpdateOne{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
+	case OpDelete, OpDeleteOne:
+		return (&UserDelete{config: c.config, hooks: c.Hooks(), mutation: m}).Exec(ctx)
+	default:
+		return nil, fmt.Errorf("ent: unknown User mutation op: %q", m.Op())
+	}
+}
+
+// hooks and interceptors per client, for fast access.
+type (
+	hooks struct {
+		Group, Pet, User []ent.Hook
+	}
+	inters struct {
+		Group, Pet, User []ent.Interceptor
+	}
+)

examples/traversal/ent/ent.go

@@ -0,0 +1,616 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"reflect"
+	"sync"
+
+	"entgo.io/ent"
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/group"
+	"entgo.io/ent/examples/traversal/ent/pet"
+	"entgo.io/ent/examples/traversal/ent/user"
+)
+
+// ent aliases to avoid import conflicts in user's code.
+type (
+	Op            = ent.Op
+	Hook          = ent.Hook
+	Value         = ent.Value
+	Query         = ent.Query
+	QueryContext  = ent.QueryContext
+	Querier       = ent.Querier
+	QuerierFunc   = ent.QuerierFunc
+	Interceptor   = ent.Interceptor
+	InterceptFunc = ent.InterceptFunc
+	Traverser     = ent.Traverser
+	TraverseFunc  = ent.TraverseFunc
+	Policy        = ent.Policy
+	Mutator       = ent.Mutator
+	Mutation      = ent.Mutation
+	MutateFunc    = ent.MutateFunc
+)
+
+type clientCtxKey struct{}
+
+// FromContext returns a Client stored inside a context, or nil if there isn't one.
+func FromContext(ctx context.Context) *Client {
+	c, _ := ctx.Value(clientCtxKey{}).(*Client)
+	return c
+}
+
+// NewContext returns a new context with the given Client attached.
+func NewContext(parent context.Context, c *Client) context.Context {
+	return context.WithValue(parent, clientCtxKey{}, c)
+}
+
+type txCtxKey struct{}
+
+// TxFromContext returns a Tx stored inside a context, or nil if there isn't one.
+func TxFromContext(ctx context.Context) *Tx {
+	tx, _ := ctx.Value(txCtxKey{}).(*Tx)
+	return tx
+}
+
+// NewTxContext returns a new context with the given Tx attached.
+func NewTxContext(parent context.Context, tx *Tx) context.Context {
+	return context.WithValue(parent, txCtxKey{}, tx)
+}
+
+// OrderFunc applies an ordering on the sql selector.
+// Deprecated: Use Asc/Desc functions or the package builders instead.
+type OrderFunc func(*sql.Selector)
+
+var (
+	initCheck   sync.Once
+	columnCheck sql.ColumnCheck
+)
+
+// checkColumn checks if the column exists in the given table.
+func checkColumn(t, c string) error {
+	initCheck.Do(func() {
+		columnCheck = sql.NewColumnCheck(map[string]func(string) bool{
+			group.Table: group.ValidColumn,
+			pet.Table:   pet.ValidColumn,
+			user.Table:  user.ValidColumn,
+		})
+	})
+	return columnCheck(t, c)
+}
+
+// Asc applies the given fields in ASC order.
+func Asc(fields ...string) func(*sql.Selector) {
+	return func(s *sql.Selector) {
+		for _, f := range fields {
+			if err := checkColumn(s.TableName(), f); err != nil {
+				s.AddError(&ValidationError{Name: f, err: fmt.Errorf("ent: %w", err)})
+			}
+			s.OrderBy(sql.Asc(s.C(f)))
+		}
+	}
+}
+
+// Desc applies the given fields in DESC order.
+func Desc(fields ...string) func(*sql.Selector) {
+	return func(s *sql.Selector) {
+		for _, f := range fields {
+			if err := checkColumn(s.TableName(), f); err != nil {
+				s.AddError(&ValidationError{Name: f, err: fmt.Errorf("ent: %w", err)})
+			}
+			s.OrderBy(sql.Desc(s.C(f)))
+		}
+	}
+}
+
+// AggregateFunc applies an aggregation step on the group-by traversal/selector.
+type AggregateFunc func(*sql.Selector) string
+
+// As is a pseudo aggregation function for renaming another other functions with custom names. For example:
+//
+//	GroupBy(field1, field2).
+//	Aggregate(ent.As(ent.Sum(field1), "sum_field1"), (ent.As(ent.Sum(field2), "sum_field2")).
+//	Scan(ctx, &v)
+func As(fn AggregateFunc, end string) AggregateFunc {
+	return func(s *sql.Selector) string {
+		return sql.As(fn(s), end)
+	}
+}
+
+// Count applies the "count" aggregation function on each group.
+func Count() AggregateFunc {
+	return func(s *sql.Selector) string {
+		return sql.Count("*")
+	}
+}
+
+// Max applies the "max" aggregation function on the given field of each group.
+func Max(field string) AggregateFunc {
+	return func(s *sql.Selector) string {
+		if err := checkColumn(s.TableName(), field); err != nil {
+			s.AddError(&ValidationError{Name: field, err: fmt.Errorf("ent: %w", err)})
+			return ""
+		}
+		return sql.Max(s.C(field))
+	}
+}
+
+// Mean applies the "mean" aggregation function on the given field of each group.
+func Mean(field string) AggregateFunc {
+	return func(s *sql.Selector) string {
+		if err := checkColumn(s.TableName(), field); err != nil {
+			s.AddError(&ValidationError{Name: field, err: fmt.Errorf("ent: %w", err)})
+			return ""
+		}
+		return sql.Avg(s.C(field))
+	}
+}
+
+// Min applies the "min" aggregation function on the given field of each group.
+func Min(field string) AggregateFunc {
+	return func(s *sql.Selector) string {
+		if err := checkColumn(s.TableName(), field); err != nil {
+			s.AddError(&ValidationError{Name: field, err: fmt.Errorf("ent: %w", err)})
+			return ""
+		}
+		return sql.Min(s.C(field))
+	}
+}
+
+// Sum applies the "sum" aggregation function on the given field of each group.
+func Sum(field string) AggregateFunc {
+	return func(s *sql.Selector) string {
+		if err := checkColumn(s.TableName(), field); err != nil {
+			s.AddError(&ValidationError{Name: field, err: fmt.Errorf("ent: %w", err)})
+			return ""
+		}
+		return sql.Sum(s.C(field))
+	}
+}
+
+// ValidationError returns when validating a field or edge fails.
+type ValidationError struct {
+	Name string // Field or edge name.
+	err  error
+}
+
+// Error implements the error interface.
+func (e *ValidationError) Error() string {
+	return e.err.Error()
+}
+
+// Unwrap implements the errors.Wrapper interface.
+func (e *ValidationError) Unwrap() error {
+	return e.err
+}
+
+// IsValidationError returns a boolean indicating whether the error is a validation error.
+func IsValidationError(err error) bool {
+	if err == nil {
+		return false
+	}
+	var e *ValidationError
+	return errors.As(err, &e)
+}
+
+// NotFoundError returns when trying to fetch a specific entity and it was not found in the database.
+type NotFoundError struct {
+	label string
+}
+
+// Error implements the error interface.
+func (e *NotFoundError) Error() string {
+	return "ent: " + e.label + " not found"
+}
+
+// IsNotFound returns a boolean indicating whether the error is a not found error.
+func IsNotFound(err error) bool {
+	if err == nil {
+		return false
+	}
+	var e *NotFoundError
+	return errors.As(err, &e)
+}
+
+// MaskNotFound masks not found error.
+func MaskNotFound(err error) error {
+	if IsNotFound(err) {
+		return nil
+	}
+	return err
+}
+
+// NotSingularError returns when trying to fetch a singular entity and more then one was found in the database.
+type NotSingularError struct {
+	label string
+}
+
+// Error implements the error interface.
+func (e *NotSingularError) Error() string {
+	return "ent: " + e.label + " not singular"
+}
+
+// IsNotSingular returns a boolean indicating whether the error is a not singular error.
+func IsNotSingular(err error) bool {
+	if err == nil {
+		return false
+	}
+	var e *NotSingularError
+	return errors.As(err, &e)
+}
+
+// NotLoadedError returns when trying to get a node that was not loaded by the query.
+type NotLoadedError struct {
+	edge string
+}
+
+// Error implements the error interface.
+func (e *NotLoadedError) Error() string {
+	return "ent: " + e.edge + " edge was not loaded"
+}
+
+// IsNotLoaded returns a boolean indicating whether the error is a not loaded error.
+func IsNotLoaded(err error) bool {
+	if err == nil {
+		return false
+	}
+	var e *NotLoadedError
+	return errors.As(err, &e)
+}
+
+// ConstraintError returns when trying to create/update one or more entities and
+// one or more of their constraints failed. For example, violation of edge or
+// field uniqueness.
+type ConstraintError struct {
+	msg  string
+	wrap error
+}
+
+// Error implements the error interface.
+func (e ConstraintError) Error() string {
+	return "ent: constraint failed: " + e.msg
+}
+
+// Unwrap implements the errors.Wrapper interface.
+func (e *ConstraintError) Unwrap() error {
+	return e.wrap
+}
+
+// IsConstraintError returns a boolean indicating whether the error is a constraint failure.
+func IsConstraintError(err error) bool {
+	if err == nil {
+		return false
+	}
+	var e *ConstraintError
+	return errors.As(err, &e)
+}
+
+// selector embedded by the different Select/GroupBy builders.
+type selector struct {
+	label string
+	flds  *[]string
+	fns   []AggregateFunc
+	scan  func(context.Context, any) error
+}
+
+// ScanX is like Scan, but panics if an error occurs.
+func (s *selector) ScanX(ctx context.Context, v any) {
+	if err := s.scan(ctx, v); err != nil {
+		panic(err)
+	}
+}
+
+// Strings returns list of strings from a selector. It is only allowed when selecting one field.
+func (s *selector) Strings(ctx context.Context) ([]string, error) {
+	if len(*s.flds) > 1 {
+		return nil, errors.New("ent: Strings is not achievable when selecting more than 1 field")
+	}
+	var v []string
+	if err := s.scan(ctx, &v); err != nil {
+		return nil, err
+	}
+	return v, nil
+}
+
+// StringsX is like Strings, but panics if an error occurs.
+func (s *selector) StringsX(ctx context.Context) []string {
+	v, err := s.Strings(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// String returns a single string from a selector. It is only allowed when selecting one field.
+func (s *selector) String(ctx context.Context) (_ string, err error) {
+	var v []string
+	if v, err = s.Strings(ctx); err != nil {
+		return
+	}
+	switch len(v) {
+	case 1:
+		return v[0], nil
+	case 0:
+		err = &NotFoundError{s.label}
+	default:
+		err = fmt.Errorf("ent: Strings returned %d results when one was expected", len(v))
+	}
+	return
+}
+
+// StringX is like String, but panics if an error occurs.
+func (s *selector) StringX(ctx context.Context) string {
+	v, err := s.String(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Ints returns list of ints from a selector. It is only allowed when selecting one field.
+func (s *selector) Ints(ctx context.Context) ([]int, error) {
+	if len(*s.flds) > 1 {
+		return nil, errors.New("ent: Ints is not achievable when selecting more than 1 field")
+	}
+	var v []int
+	if err := s.scan(ctx, &v); err != nil {
+		return nil, err
+	}
+	return v, nil
+}
+
+// IntsX is like Ints, but panics if an error occurs.
+func (s *selector) IntsX(ctx context.Context) []int {
+	v, err := s.Ints(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Int returns a single int from a selector. It is only allowed when selecting one field.
+func (s *selector) Int(ctx context.Context) (_ int, err error) {
+	var v []int
+	if v, err = s.Ints(ctx); err != nil {
+		return
+	}
+	switch len(v) {
+	case 1:
+		return v[0], nil
+	case 0:
+		err = &NotFoundError{s.label}
+	default:
+		err = fmt.Errorf("ent: Ints returned %d results when one was expected", len(v))
+	}
+	return
+}
+
+// IntX is like Int, but panics if an error occurs.
+func (s *selector) IntX(ctx context.Context) int {
+	v, err := s.Int(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Float64s returns list of float64s from a selector. It is only allowed when selecting one field.
+func (s *selector) Float64s(ctx context.Context) ([]float64, error) {
+	if len(*s.flds) > 1 {
+		return nil, errors.New("ent: Float64s is not achievable when selecting more than 1 field")
+	}
+	var v []float64
+	if err := s.scan(ctx, &v); err != nil {
+		return nil, err
+	}
+	return v, nil
+}
+
+// Float64sX is like Float64s, but panics if an error occurs.
+func (s *selector) Float64sX(ctx context.Context) []float64 {
+	v, err := s.Float64s(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Float64 returns a single float64 from a selector. It is only allowed when selecting one field.
+func (s *selector) Float64(ctx context.Context) (_ float64, err error) {
+	var v []float64
+	if v, err = s.Float64s(ctx); err != nil {
+		return
+	}
+	switch len(v) {
+	case 1:
+		return v[0], nil
+	case 0:
+		err = &NotFoundError{s.label}
+	default:
+		err = fmt.Errorf("ent: Float64s returned %d results when one was expected", len(v))
+	}
+	return
+}
+
+// Float64X is like Float64, but panics if an error occurs.
+func (s *selector) Float64X(ctx context.Context) float64 {
+	v, err := s.Float64(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Bools returns list of bools from a selector. It is only allowed when selecting one field.
+func (s *selector) Bools(ctx context.Context) ([]bool, error) {
+	if len(*s.flds) > 1 {
+		return nil, errors.New("ent: Bools is not achievable when selecting more than 1 field")
+	}
+	var v []bool
+	if err := s.scan(ctx, &v); err != nil {
+		return nil, err
+	}
+	return v, nil
+}
+
+// BoolsX is like Bools, but panics if an error occurs.
+func (s *selector) BoolsX(ctx context.Context) []bool {
+	v, err := s.Bools(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Bool returns a single bool from a selector. It is only allowed when selecting one field.
+func (s *selector) Bool(ctx context.Context) (_ bool, err error) {
+	var v []bool
+	if v, err = s.Bools(ctx); err != nil {
+		return
+	}
+	switch len(v) {
+	case 1:
+		return v[0], nil
+	case 0:
+		err = &NotFoundError{s.label}
+	default:
+		err = fmt.Errorf("ent: Bools returned %d results when one was expected", len(v))
+	}
+	return
+}
+
+// BoolX is like Bool, but panics if an error occurs.
+func (s *selector) BoolX(ctx context.Context) bool {
+	v, err := s.Bool(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// withHooks invokes the builder operation with the given hooks, if any.
+func withHooks[V Value, M any, PM interface {
+	*M
+	Mutation
+}](ctx context.Context, exec func(context.Context) (V, error), mutation PM, hooks []Hook) (value V, err error) {
+	if len(hooks) == 0 {
+		return exec(ctx)
+	}
+	var mut Mutator = MutateFunc(func(ctx context.Context, m Mutation) (Value, error) {
+		mutationT, ok := any(m).(PM)
+		if !ok {
+			return nil, fmt.Errorf("unexpected mutation type %T", m)
+		}
+		// Set the mutation to the builder.
+		*mutation = *mutationT
+		return exec(ctx)
+	})
+	for i := len(hooks) - 1; i >= 0; i-- {
+		if hooks[i] == nil {
+			return value, fmt.Errorf("ent: uninitialized hook (forgotten import ent/runtime?)")
+		}
+		mut = hooks[i](mut)
+	}
+	v, err := mut.Mutate(ctx, mutation)
+	if err != nil {
+		return value, err
+	}
+	nv, ok := v.(V)
+	if !ok {
+		return value, fmt.Errorf("unexpected node type %T returned from %T", v, mutation)
+	}
+	return nv, nil
+}
+
+// setContextOp returns a new context with the given QueryContext attached (including its op) in case it does not exist.
+func setContextOp(ctx context.Context, qc *QueryContext, op string) context.Context {
+	if ent.QueryFromContext(ctx) == nil {
+		qc.Op = op
+		ctx = ent.NewQueryContext(ctx, qc)
+	}
+	return ctx
+}
+
+func querierAll[V Value, Q interface {
+	sqlAll(context.Context, ...queryHook) (V, error)
+}]() Querier {
+	return QuerierFunc(func(ctx context.Context, q Query) (Value, error) {
+		query, ok := q.(Q)
+		if !ok {
+			return nil, fmt.Errorf("unexpected query type %T", q)
+		}
+		return query.sqlAll(ctx)
+	})
+}
+
+func querierCount[Q interface {
+	sqlCount(context.Context) (int, error)
+}]() Querier {
+	return QuerierFunc(func(ctx context.Context, q Query) (Value, error) {
+		query, ok := q.(Q)
+		if !ok {
+			return nil, fmt.Errorf("unexpected query type %T", q)
+		}
+		return query.sqlCount(ctx)
+	})
+}
+
+func withInterceptors[V Value](ctx context.Context, q Query, qr Querier, inters []Interceptor) (v V, err error) {
+	for i := len(inters) - 1; i >= 0; i-- {
+		qr = inters[i].Intercept(qr)
+	}
+	rv, err := qr.Query(ctx, q)
+	if err != nil {
+		return v, err
+	}
+	vt, ok := rv.(V)
+	if !ok {
+		return v, fmt.Errorf("unexpected type %T returned from %T. expected type: %T", vt, q, v)
+	}
+	return vt, nil
+}
+
+func scanWithInterceptors[Q1 ent.Query, Q2 interface {
+	sqlScan(context.Context, Q1, any) error
+}](ctx context.Context, rootQuery Q1, selectOrGroup Q2, inters []Interceptor, v any) error {
+	rv := reflect.ValueOf(v)
+	var qr Querier = QuerierFunc(func(ctx context.Context, q Query) (Value, error) {
+		query, ok := q.(Q1)
+		if !ok {
+			return nil, fmt.Errorf("unexpected query type %T", q)
+		}
+		if err := selectOrGroup.sqlScan(ctx, query, v); err != nil {
+			return nil, err
+		}
+		if k := rv.Kind(); k == reflect.Pointer && rv.Elem().CanInterface() {
+			return rv.Elem().Interface(), nil
+		}
+		return v, nil
+	})
+	for i := len(inters) - 1; i >= 0; i-- {
+		qr = inters[i].Intercept(qr)
+	}
+	vv, err := qr.Query(ctx, rootQuery)
+	if err != nil {
+		return err
+	}
+	switch rv2 := reflect.ValueOf(vv); {
+	case rv.IsNil(), rv2.IsNil(), rv.Kind() != reflect.Pointer:
+	case rv.Type() == rv2.Type():
+		rv.Elem().Set(rv2.Elem())
+	case rv.Elem().Type() == rv2.Type():
+		rv.Elem().Set(rv2)
+	}
+	return nil
+}
+
+// queryHook describes an internal hook for the different sqlAll methods.
+type queryHook func(context.Context, *sqlgraph.QuerySpec)

examples/traversal/ent/enttest/enttest.go

@@ -0,0 +1,88 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package enttest
+
+import (
+	"context"
+
+	"entgo.io/ent/examples/traversal/ent"
+	// required by schema hooks.
+	_ "entgo.io/ent/examples/traversal/ent/runtime"
+
+	"entgo.io/ent/dialect/sql/schema"
+	"entgo.io/ent/examples/traversal/ent/migrate"
+)
+
+type (
+	// TestingT is the interface that is shared between
+	// testing.T and testing.B and used by enttest.
+	TestingT interface {
+		FailNow()
+		Error(...any)
+	}
+
+	// Option configures client creation.
+	Option func(*options)
+
+	options struct {
+		opts        []ent.Option
+		migrateOpts []schema.MigrateOption
+	}
+)
+
+// WithOptions forwards options to client creation.
+func WithOptions(opts ...ent.Option) Option {
+	return func(o *options) {
+		o.opts = append(o.opts, opts...)
+	}
+}
+
+// WithMigrateOptions forwards options to auto migration.
+func WithMigrateOptions(opts ...schema.MigrateOption) Option {
+	return func(o *options) {
+		o.migrateOpts = append(o.migrateOpts, opts...)
+	}
+}
+
+func newOptions(opts []Option) *options {
+	o := &options{}
+	for _, opt := range opts {
+		opt(o)
+	}
+	return o
+}
+
+// Open calls ent.Open and auto-run migration.
+func Open(t TestingT, driverName, dataSourceName string, opts ...Option) *ent.Client {
+	o := newOptions(opts)
+	c, err := ent.Open(driverName, dataSourceName, o.opts...)
+	if err != nil {
+		t.Error(err)
+		t.FailNow()
+	}
+	migrateSchema(t, c, o)
+	return c
+}
+
+// NewClient calls ent.NewClient and auto-run migration.
+func NewClient(t TestingT, opts ...Option) *ent.Client {
+	o := newOptions(opts)
+	c := ent.NewClient(o.opts...)
+	migrateSchema(t, c, o)
+	return c
+}
+func migrateSchema(t TestingT, c *ent.Client, o *options) {
+	tables, err := schema.CopyTables(migrate.Tables)
+	if err != nil {
+		t.Error(err)
+		t.FailNow()
+	}
+	if err := migrate.Create(context.Background(), c.Schema, tables, o.migrateOpts...); err != nil {
+		t.Error(err)
+		t.FailNow()
+	}
+}

examples/traversal/ent/generate.go

@@ -0,0 +1,7 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+package ent
+
+//go:generate go run -mod=mod entgo.io/ent/cmd/ent generate --header "// Copyright 2019-present Facebook Inc. All rights reserved.\n// This source code is licensed under the Apache 2.0 license found\n// in the LICENSE file in the root directory of this source tree.\n\n// Code generated by ent, DO NOT EDIT." ./schema

examples/traversal/ent/group.go

@@ -0,0 +1,162 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"fmt"
+	"strings"
+
+	"entgo.io/ent"
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/examples/traversal/ent/group"
+	"entgo.io/ent/examples/traversal/ent/user"
+)
+
+// Group is the model entity for the Group schema.
+type Group struct {
+	config `json:"-"`
+	// ID of the ent.
+	ID int `json:"id,omitempty"`
+	// Name holds the value of the "name" field.
+	Name string `json:"name,omitempty"`
+	// Edges holds the relations/edges for other nodes in the graph.
+	// The values are being populated by the GroupQuery when eager-loading is set.
+	Edges        GroupEdges `json:"edges"`
+	group_admin  *int
+	selectValues sql.SelectValues
+}
+
+// GroupEdges holds the relations/edges for other nodes in the graph.
+type GroupEdges struct {
+	// Users holds the value of the users edge.
+	Users []*User `json:"users,omitempty"`
+	// Admin holds the value of the admin edge.
+	Admin *User `json:"admin,omitempty"`
+	// loadedTypes holds the information for reporting if a
+	// type was loaded (or requested) in eager-loading or not.
+	loadedTypes [2]bool
+}
+
+// UsersOrErr returns the Users value or an error if the edge
+// was not loaded in eager-loading.
+func (e GroupEdges) UsersOrErr() ([]*User, error) {
+	if e.loadedTypes[0] {
+		return e.Users, nil
+	}
+	return nil, &NotLoadedError{edge: "users"}
+}
+
+// AdminOrErr returns the Admin value or an error if the edge
+// was not loaded in eager-loading, or loaded but was not found.
+func (e GroupEdges) AdminOrErr() (*User, error) {
+	if e.Admin != nil {
+		return e.Admin, nil
+	} else if e.loadedTypes[1] {
+		return nil, &NotFoundError{label: user.Label}
+	}
+	return nil, &NotLoadedError{edge: "admin"}
+}
+
+// scanValues returns the types for scanning values from sql.Rows.
+func (*Group) scanValues(columns []string) ([]any, error) {
+	values := make([]any, len(columns))
+	for i := range columns {
+		switch columns[i] {
+		case group.FieldID:
+			values[i] = new(sql.NullInt64)
+		case group.FieldName:
+			values[i] = new(sql.NullString)
+		case group.ForeignKeys[0]: // group_admin
+			values[i] = new(sql.NullInt64)
+		default:
+			values[i] = new(sql.UnknownType)
+		}
+	}
+	return values, nil
+}
+
+// assignValues assigns the values that were returned from sql.Rows (after scanning)
+// to the Group fields.
+func (_m *Group) assignValues(columns []string, values []any) error {
+	if m, n := len(values), len(columns); m < n {
+		return fmt.Errorf("mismatch number of scan values: %d != %d", m, n)
+	}
+	for i := range columns {
+		switch columns[i] {
+		case group.FieldID:
+			value, ok := values[i].(*sql.NullInt64)
+			if !ok {
+				return fmt.Errorf("unexpected type %T for field id", value)
+			}
+			_m.ID = int(value.Int64)
+		case group.FieldName:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field name", values[i])
+			} else if value.Valid {
+				_m.Name = value.String
+			}
+		case group.ForeignKeys[0]:
+			if value, ok := values[i].(*sql.NullInt64); !ok {
+				return fmt.Errorf("unexpected type %T for edge-field group_admin", value)
+			} else if value.Valid {
+				_m.group_admin = new(int)
+				*_m.group_admin = int(value.Int64)
+			}
+		default:
+			_m.selectValues.Set(columns[i], values[i])
+		}
+	}
+	return nil
+}
+
+// Value returns the ent.Value that was dynamically selected and assigned to the Group.
+// This includes values selected through modifiers, order, etc.
+func (_m *Group) Value(name string) (ent.Value, error) {
+	return _m.selectValues.Get(name)
+}
+
+// QueryUsers queries the "users" edge of the Group entity.
+func (_m *Group) QueryUsers() *UserQuery {
+	return NewGroupClient(_m.config).QueryUsers(_m)
+}
+
+// QueryAdmin queries the "admin" edge of the Group entity.
+func (_m *Group) QueryAdmin() *UserQuery {
+	return NewGroupClient(_m.config).QueryAdmin(_m)
+}
+
+// Update returns a builder for updating this Group.
+// Note that you need to call Group.Unwrap() before calling this method if this Group
+// was returned from a transaction, and the transaction was committed or rolled back.
+func (_m *Group) Update() *GroupUpdateOne {
+	return NewGroupClient(_m.config).UpdateOne(_m)
+}
+
+// Unwrap unwraps the Group entity that was returned from a transaction after it was closed,
+// so that all future queries will be executed through the driver which created the transaction.
+func (_m *Group) Unwrap() *Group {
+	_tx, ok := _m.config.driver.(*txDriver)
+	if !ok {
+		panic("ent: Group is not a transactional entity")
+	}
+	_m.config.driver = _tx.drv
+	return _m
+}
+
+// String implements the fmt.Stringer.
+func (_m *Group) String() string {
+	var builder strings.Builder
+	builder.WriteString("Group(")
+	builder.WriteString(fmt.Sprintf("id=%v, ", _m.ID))
+	builder.WriteString("name=")
+	builder.WriteString(_m.Name)
+	builder.WriteByte(')')
+	return builder.String()
+}
+
+// Groups is a parsable slice of Group.
+type Groups []*Group

examples/traversal/ent/group/group.go

@@ -0,0 +1,120 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package group
+
+import (
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+)
+
+const (
+	// Label holds the string label denoting the group type in the database.
+	Label = "group"
+	// FieldID holds the string denoting the id field in the database.
+	FieldID = "id"
+	// FieldName holds the string denoting the name field in the database.
+	FieldName = "name"
+	// EdgeUsers holds the string denoting the users edge name in mutations.
+	EdgeUsers = "users"
+	// EdgeAdmin holds the string denoting the admin edge name in mutations.
+	EdgeAdmin = "admin"
+	// Table holds the table name of the group in the database.
+	Table = "groups"
+	// UsersTable is the table that holds the users relation/edge. The primary key declared below.
+	UsersTable = "group_users"
+	// UsersInverseTable is the table name for the User entity.
+	// It exists in this package in order to avoid circular dependency with the "user" package.
+	UsersInverseTable = "users"
+	// AdminTable is the table that holds the admin relation/edge.
+	AdminTable = "groups"
+	// AdminInverseTable is the table name for the User entity.
+	// It exists in this package in order to avoid circular dependency with the "user" package.
+	AdminInverseTable = "users"
+	// AdminColumn is the table column denoting the admin relation/edge.
+	AdminColumn = "group_admin"
+)
+
+// Columns holds all SQL columns for group fields.
+var Columns = []string{
+	FieldID,
+	FieldName,
+}
+
+// ForeignKeys holds the SQL foreign-keys that are owned by the "groups"
+// table and are not defined as standalone fields in the schema.
+var ForeignKeys = []string{
+	"group_admin",
+}
+
+var (
+	// UsersPrimaryKey and UsersColumn2 are the table columns denoting the
+	// primary key for the users relation (M2M).
+	UsersPrimaryKey = []string{"group_id", "user_id"}
+)
+
+// ValidColumn reports if the column name is valid (part of the table columns).
+func ValidColumn(column string) bool {
+	for i := range Columns {
+		if column == Columns[i] {
+			return true
+		}
+	}
+	for i := range ForeignKeys {
+		if column == ForeignKeys[i] {
+			return true
+		}
+	}
+	return false
+}
+
+// OrderOption defines the ordering options for the Group queries.
+type OrderOption func(*sql.Selector)
+
+// ByID orders the results by the id field.
+func ByID(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldID, opts...).ToFunc()
+}
+
+// ByName orders the results by the name field.
+func ByName(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldName, opts...).ToFunc()
+}
+
+// ByUsersCount orders the results by users count.
+func ByUsersCount(opts ...sql.OrderTermOption) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborsCount(s, newUsersStep(), opts...)
+	}
+}
+
+// ByUsers orders the results by users terms.
+func ByUsers(term sql.OrderTerm, terms ...sql.OrderTerm) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborTerms(s, newUsersStep(), append([]sql.OrderTerm{term}, terms...)...)
+	}
+}
+
+// ByAdminField orders the results by admin field.
+func ByAdminField(field string, opts ...sql.OrderTermOption) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborTerms(s, newAdminStep(), sql.OrderByField(field, opts...))
+	}
+}
+func newUsersStep() *sqlgraph.Step {
+	return sqlgraph.NewStep(
+		sqlgraph.From(Table, FieldID),
+		sqlgraph.To(UsersInverseTable, FieldID),
+		sqlgraph.Edge(sqlgraph.M2M, false, UsersTable, UsersPrimaryKey...),
+	)
+}
+func newAdminStep() *sqlgraph.Step {
+	return sqlgraph.NewStep(
+		sqlgraph.From(Table, FieldID),
+		sqlgraph.To(AdminInverseTable, FieldID),
+		sqlgraph.Edge(sqlgraph.M2O, false, AdminTable, AdminColumn),
+	)
+}

examples/traversal/ent/group/mutation.go

@@ -0,0 +1,385 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package group
+
+import (
+	"context"
+	"fmt"
+
+	"entgo.io/ent"
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+)
+
+// Mutation represents an operation that mutates the Group nodes in the graph.
+type Mutation struct {
+	op            ent.Op
+	typ           string
+	name          *string
+	clearedFields map[string]struct{}
+	users         map[int]struct{}
+	removedusers  map[int]struct{}
+	clearedusers  bool
+	admin         *int
+	clearedadmin  bool
+	predicates    []predicate.Group
+}
+
+// NewMutation creates a new Mutation for the Group entity.
+func NewMutation(op ent.Op) *Mutation {
+	return &Mutation{
+		op:            op,
+		typ:           "Group",
+		clearedFields: make(map[string]struct{}),
+	}
+}
+
+// Predicates returns the list of predicates set on the mutation.
+func (m *Mutation) Predicates() []predicate.Group {
+	return m.predicates
+}
+
+// SetName sets the "name" field.
+func (m *Mutation) SetName(s string) {
+	m.name = &s
+}
+
+// Name returns the value of the "name" field in the mutation.
+func (m *Mutation) Name() (r string, exists bool) {
+	v := m.name
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// ResetName resets all changes to the "name" field.
+func (m *Mutation) ResetName() {
+	m.name = nil
+}
+
+// AddUserIDs adds the "users" edge to the User entity by ids.
+func (m *Mutation) AddUserIDs(ids ...int) {
+	if m.users == nil {
+		m.users = make(map[int]struct{})
+	}
+	for i := range ids {
+		m.users[ids[i]] = struct{}{}
+	}
+}
+
+// ClearUsers clears the "users" edge to the User entity.
+func (m *Mutation) ClearUsers() {
+	m.clearedusers = true
+}
+
+// UsersCleared reports if the "users" edge to the User entity was cleared.
+func (m *Mutation) UsersCleared() bool {
+	return m.clearedusers
+}
+
+// RemoveUserIDs removes the "users" edge to the User entity by IDs.
+func (m *Mutation) RemoveUserIDs(ids ...int) {
+	if m.removedusers == nil {
+		m.removedusers = make(map[int]struct{})
+	}
+	for i := range ids {
+		delete(m.users, ids[i])
+		m.removedusers[ids[i]] = struct{}{}
+	}
+}
+
+// RemovedUsers returns the removed IDs of the "users" edge to the User entity.
+func (m *Mutation) RemovedUsersIDs() (ids []int) {
+	for id := range m.removedusers {
+		ids = append(ids, id)
+	}
+	return
+}
+
+// UsersIDs returns the "users" edge IDs in the mutation.
+func (m *Mutation) UsersIDs() (ids []int) {
+	for id := range m.users {
+		ids = append(ids, id)
+	}
+	return
+}
+
+// ResetUsers resets all changes to the "users" edge.
+func (m *Mutation) ResetUsers() {
+	m.users = nil
+	m.clearedusers = false
+	m.removedusers = nil
+}
+
+// SetAdminID sets the "admin" edge to the User entity by id.
+func (m *Mutation) SetAdminID(id int) {
+	m.admin = &id
+}
+
+// ClearAdmin clears the "admin" edge to the User entity.
+func (m *Mutation) ClearAdmin() {
+	m.clearedadmin = true
+}
+
+// AdminCleared reports if the "admin" edge to the User entity was cleared.
+func (m *Mutation) AdminCleared() bool {
+	return m.clearedadmin
+}
+
+// AdminID returns the "admin" edge ID in the mutation.
+func (m *Mutation) AdminID() (id int, exists bool) {
+	if m.admin != nil {
+		return *m.admin, true
+	}
+	return
+}
+
+// AdminIDs returns the "admin" edge IDs in the mutation.
+// Note that IDs always returns len(IDs) <= 1 for unique edges, and you should use
+// AdminID instead. It exists only for internal usage by the builders.
+func (m *Mutation) AdminIDs() (ids []int) {
+	if id := m.admin; id != nil {
+		ids = append(ids, *id)
+	}
+	return
+}
+
+// ResetAdmin resets all changes to the "admin" edge.
+func (m *Mutation) ResetAdmin() {
+	m.admin = nil
+	m.clearedadmin = false
+}
+
+// Where appends a list predicates to the Mutation builder.
+func (m *Mutation) Where(ps ...predicate.Group) {
+	m.predicates = append(m.predicates, ps...)
+}
+
+// WhereP appends storage-level predicates to the Mutation builder. Using this method,
+// users can use type-assertion to append predicates that do not depend on any generated package.
+func (m *Mutation) WhereP(ps ...func(*sql.Selector)) {
+	p := make([]predicate.Group, len(ps))
+	for i := range ps {
+		p[i] = ps[i]
+	}
+	m.Where(p...)
+}
+
+// Op returns the operation name.
+func (m *Mutation) Op() ent.Op {
+	return m.op
+}
+
+// SetOp allows setting the mutation operation.
+func (m *Mutation) SetOp(op ent.Op) {
+	m.op = op
+}
+
+// Type returns the node type of this mutation (Group).
+func (m *Mutation) Type() string {
+	return m.typ
+}
+
+// Fields returns all fields that were changed during this mutation. Note that in
+// order to get all numeric fields that were incremented/decremented, call
+// AddedFields().
+func (m *Mutation) Fields() []string {
+	fields := make([]string, 0, 1)
+	if m.name != nil {
+		fields = append(fields, FieldName)
+	}
+	return fields
+}
+
+// Field returns the value of a field with the given name. The second boolean
+// return value indicates that this field was not set, or was not defined in the
+// schema.
+func (m *Mutation) Field(name string) (ent.Value, bool) {
+	switch name {
+	case FieldName:
+		return m.Name()
+	}
+	return nil, false
+}
+
+// OldField returns the old value of the field from the database. An error is
+// returned if the mutation operation is not UpdateOne, or the query to the
+// database failed.
+func (m *Mutation) OldField(ctx context.Context, name string) (ent.Value, error) {
+	return nil, fmt.Errorf("unknown Group field %s", name)
+}
+
+// SetField sets the value of a field with the given name. It returns an error if
+// the field is not defined in the schema, or if the type mismatched the field
+// type.
+func (m *Mutation) SetField(name string, value ent.Value) error {
+	switch name {
+	case FieldName:
+		v, ok := value.(string)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.SetName(v)
+		return nil
+	}
+	return fmt.Errorf("unknown Group field %s", name)
+}
+
+// AddedFields returns all numeric fields that were incremented/decremented during
+// this mutation.
+func (m *Mutation) AddedFields() []string {
+	return nil
+}
+
+// AddedField returns the numeric value that was incremented/decremented on a field
+// with the given name. The second boolean return value indicates that this field
+// was not set, or was not defined in the schema.
+func (m *Mutation) AddedField(name string) (ent.Value, bool) {
+	return nil, false
+}
+
+// AddField adds the value to the field with the given name. It returns an error if
+// the field is not defined in the schema, or if the type mismatched the field
+// type.
+func (m *Mutation) AddField(name string, value ent.Value) error {
+	switch name {
+	}
+	return fmt.Errorf("unknown Group numeric field %s", name)
+}
+
+// ClearedFields returns all nullable fields that were cleared during this
+// mutation.
+func (m *Mutation) ClearedFields() []string {
+	return nil
+}
+
+// FieldCleared returns a boolean indicating if a field with the given name was
+// cleared in this mutation.
+func (m *Mutation) FieldCleared(name string) bool {
+	_, ok := m.clearedFields[name]
+	return ok
+}
+
+// ClearField clears the value of the field with the given name. It returns an
+// error if the field is not defined in the schema.
+func (m *Mutation) ClearField(name string) error {
+	return fmt.Errorf("unknown Group nullable field %s", name)
+}
+
+// ResetField resets all changes in the mutation for the field with the given name.
+// It returns an error if the field is not defined in the schema.
+func (m *Mutation) ResetField(name string) error {
+	switch name {
+	case FieldName:
+		m.ResetName()
+		return nil
+	}
+	return fmt.Errorf("unknown Group field %s", name)
+}
+
+// AddedEdges returns all edge names that were set/added in this mutation.
+func (m *Mutation) AddedEdges() []string {
+	edges := make([]string, 0, 2)
+	if m.users != nil {
+		edges = append(edges, EdgeUsers)
+	}
+	if m.admin != nil {
+		edges = append(edges, EdgeAdmin)
+	}
+	return edges
+}
+
+// AddedIDs returns all IDs (to other nodes) that were added for the given edge
+// name in this mutation.
+func (m *Mutation) AddedIDs(name string) []ent.Value {
+	switch name {
+	case EdgeUsers:
+		ids := make([]ent.Value, 0, len(m.users))
+		for id := range m.users {
+			ids = append(ids, id)
+		}
+		return ids
+	case EdgeAdmin:
+		if id := m.admin; id != nil {
+			return []ent.Value{*id}
+		}
+	}
+	return nil
+}
+
+// RemovedEdges returns all edge names that were removed in this mutation.
+func (m *Mutation) RemovedEdges() []string {
+	edges := make([]string, 0, 2)
+	if m.removedusers != nil {
+		edges = append(edges, EdgeUsers)
+	}
+	return edges
+}
+
+// RemovedIDs returns all IDs (to other nodes) that were removed for the edge with
+// the given name in this mutation.
+func (m *Mutation) RemovedIDs(name string) []ent.Value {
+	switch name {
+	case EdgeUsers:
+		ids := make([]ent.Value, 0, len(m.removedusers))
+		for id := range m.removedusers {
+			ids = append(ids, id)
+		}
+		return ids
+	}
+	return nil
+}
+
+// ClearedEdges returns all edge names that were cleared in this mutation.
+func (m *Mutation) ClearedEdges() []string {
+	edges := make([]string, 0, 2)
+	if m.clearedusers {
+		edges = append(edges, EdgeUsers)
+	}
+	if m.clearedadmin {
+		edges = append(edges, EdgeAdmin)
+	}
+	return edges
+}
+
+// EdgeCleared returns a boolean which indicates if the edge with the given name
+// was cleared in this mutation.
+func (m *Mutation) EdgeCleared(name string) bool {
+	switch name {
+	case EdgeUsers:
+		return m.clearedusers
+	case EdgeAdmin:
+		return m.clearedadmin
+	}
+	return false
+}
+
+// ClearEdge clears the value of the edge with the given name. It returns an error
+// if that edge is not defined in the schema.
+func (m *Mutation) ClearEdge(name string) error {
+	switch name {
+	case EdgeAdmin:
+		m.ClearAdmin()
+		return nil
+	}
+	return fmt.Errorf("unknown Group unique edge %s", name)
+}
+
+// ResetEdge resets all changes to the edge with the given name in this mutation.
+// It returns an error if the edge is not defined in the schema.
+func (m *Mutation) ResetEdge(name string) error {
+	switch name {
+	case EdgeUsers:
+		m.ResetUsers()
+		return nil
+	case EdgeAdmin:
+		m.ResetAdmin()
+		return nil
+	}
+	return fmt.Errorf("unknown Group edge %s", name)
+}

examples/traversal/ent/group/where.go

@@ -0,0 +1,189 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package group
+
+import (
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+)
+
+// ID filters vertices based on their ID field.
+func ID(id int) predicate.Group {
+	return predicate.Group(sql.FieldEQ(FieldID, id))
+}
+
+// IDEQ applies the EQ predicate on the ID field.
+func IDEQ(id int) predicate.Group {
+	return predicate.Group(sql.FieldEQ(FieldID, id))
+}
+
+// IDNEQ applies the NEQ predicate on the ID field.
+func IDNEQ(id int) predicate.Group {
+	return predicate.Group(sql.FieldNEQ(FieldID, id))
+}
+
+// IDIn applies the In predicate on the ID field.
+func IDIn(ids ...int) predicate.Group {
+	return predicate.Group(sql.FieldIn(FieldID, ids...))
+}
+
+// IDNotIn applies the NotIn predicate on the ID field.
+func IDNotIn(ids ...int) predicate.Group {
+	return predicate.Group(sql.FieldNotIn(FieldID, ids...))
+}
+
+// IDGT applies the GT predicate on the ID field.
+func IDGT(id int) predicate.Group {
+	return predicate.Group(sql.FieldGT(FieldID, id))
+}
+
+// IDGTE applies the GTE predicate on the ID field.
+func IDGTE(id int) predicate.Group {
+	return predicate.Group(sql.FieldGTE(FieldID, id))
+}
+
+// IDLT applies the LT predicate on the ID field.
+func IDLT(id int) predicate.Group {
+	return predicate.Group(sql.FieldLT(FieldID, id))
+}
+
+// IDLTE applies the LTE predicate on the ID field.
+func IDLTE(id int) predicate.Group {
+	return predicate.Group(sql.FieldLTE(FieldID, id))
+}
+
+// Name applies equality check predicate on the "name" field. It's identical to NameEQ.
+func Name(v string) predicate.Group {
+	return predicate.Group(sql.FieldEQ(FieldName, v))
+}
+
+// NameEQ applies the EQ predicate on the "name" field.
+func NameEQ(v string) predicate.Group {
+	return predicate.Group(sql.FieldEQ(FieldName, v))
+}
+
+// NameNEQ applies the NEQ predicate on the "name" field.
+func NameNEQ(v string) predicate.Group {
+	return predicate.Group(sql.FieldNEQ(FieldName, v))
+}
+
+// NameIn applies the In predicate on the "name" field.
+func NameIn(vs ...string) predicate.Group {
+	return predicate.Group(sql.FieldIn(FieldName, vs...))
+}
+
+// NameNotIn applies the NotIn predicate on the "name" field.
+func NameNotIn(vs ...string) predicate.Group {
+	return predicate.Group(sql.FieldNotIn(FieldName, vs...))
+}
+
+// NameGT applies the GT predicate on the "name" field.
+func NameGT(v string) predicate.Group {
+	return predicate.Group(sql.FieldGT(FieldName, v))
+}
+
+// NameGTE applies the GTE predicate on the "name" field.
+func NameGTE(v string) predicate.Group {
+	return predicate.Group(sql.FieldGTE(FieldName, v))
+}
+
+// NameLT applies the LT predicate on the "name" field.
+func NameLT(v string) predicate.Group {
+	return predicate.Group(sql.FieldLT(FieldName, v))
+}
+
+// NameLTE applies the LTE predicate on the "name" field.
+func NameLTE(v string) predicate.Group {
+	return predicate.Group(sql.FieldLTE(FieldName, v))
+}
+
+// NameContains applies the Contains predicate on the "name" field.
+func NameContains(v string) predicate.Group {
+	return predicate.Group(sql.FieldContains(FieldName, v))
+}
+
+// NameHasPrefix applies the HasPrefix predicate on the "name" field.
+func NameHasPrefix(v string) predicate.Group {
+	return predicate.Group(sql.FieldHasPrefix(FieldName, v))
+}
+
+// NameHasSuffix applies the HasSuffix predicate on the "name" field.
+func NameHasSuffix(v string) predicate.Group {
+	return predicate.Group(sql.FieldHasSuffix(FieldName, v))
+}
+
+// NameEqualFold applies the EqualFold predicate on the "name" field.
+func NameEqualFold(v string) predicate.Group {
+	return predicate.Group(sql.FieldEqualFold(FieldName, v))
+}
+
+// NameContainsFold applies the ContainsFold predicate on the "name" field.
+func NameContainsFold(v string) predicate.Group {
+	return predicate.Group(sql.FieldContainsFold(FieldName, v))
+}
+
+// HasUsers applies the HasEdge predicate on the "users" edge.
+func HasUsers() predicate.Group {
+	return predicate.Group(func(s *sql.Selector) {
+		step := sqlgraph.NewStep(
+			sqlgraph.From(Table, FieldID),
+			sqlgraph.Edge(sqlgraph.M2M, false, UsersTable, UsersPrimaryKey...),
+		)
+		sqlgraph.HasNeighbors(s, step)
+	})
+}
+
+// HasUsersWith applies the HasEdge predicate on the "users" edge with a given conditions (other predicates).
+func HasUsersWith(preds ...predicate.User) predicate.Group {
+	return predicate.Group(func(s *sql.Selector) {
+		step := newUsersStep()
+		sqlgraph.HasNeighborsWith(s, step, func(s *sql.Selector) {
+			for _, p := range preds {
+				p(s)
+			}
+		})
+	})
+}
+
+// HasAdmin applies the HasEdge predicate on the "admin" edge.
+func HasAdmin() predicate.Group {
+	return predicate.Group(func(s *sql.Selector) {
+		step := sqlgraph.NewStep(
+			sqlgraph.From(Table, FieldID),
+			sqlgraph.Edge(sqlgraph.M2O, false, AdminTable, AdminColumn),
+		)
+		sqlgraph.HasNeighbors(s, step)
+	})
+}
+
+// HasAdminWith applies the HasEdge predicate on the "admin" edge with a given conditions (other predicates).
+func HasAdminWith(preds ...predicate.User) predicate.Group {
+	return predicate.Group(func(s *sql.Selector) {
+		step := newAdminStep()
+		sqlgraph.HasNeighborsWith(s, step, func(s *sql.Selector) {
+			for _, p := range preds {
+				p(s)
+			}
+		})
+	})
+}
+
+// And groups predicates with the AND operator between them.
+func And(predicates ...predicate.Group) predicate.Group {
+	return predicate.Group(sql.AndPredicates(predicates...))
+}
+
+// Or groups predicates with the OR operator between them.
+func Or(predicates ...predicate.Group) predicate.Group {
+	return predicate.Group(sql.OrPredicates(predicates...))
+}
+
+// Not applies the not operator on the given predicate.
+func Not(p predicate.Group) predicate.Group {
+	return predicate.Group(sql.NotPredicates(p))
+}

examples/traversal/ent/group_create.go

@@ -0,0 +1,255 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/group"
+	"entgo.io/ent/examples/traversal/ent/user"
+	"entgo.io/ent/schema/field"
+)
+
+// GroupCreate is the builder for creating a Group entity.
+type GroupCreate struct {
+	config
+	mutation *GroupMutation
+	hooks    []Hook
+}
+
+// SetName sets the "name" field.
+func (_c *GroupCreate) SetName(v string) *GroupCreate {
+	_c.mutation.SetName(v)
+	return _c
+}
+
+// AddUserIDs adds the "users" edge to the User entity by IDs.
+func (_c *GroupCreate) AddUserIDs(ids ...int) *GroupCreate {
+	_c.mutation.AddUserIDs(ids...)
+	return _c
+}
+
+// AddUsers adds the "users" edges to the User entity.
+func (_c *GroupCreate) AddUsers(v ...*User) *GroupCreate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _c.AddUserIDs(ids...)
+}
+
+// SetAdminID sets the "admin" edge to the User entity by ID.
+func (_c *GroupCreate) SetAdminID(id int) *GroupCreate {
+	_c.mutation.SetAdminID(id)
+	return _c
+}
+
+// SetNillableAdminID sets the "admin" edge to the User entity by ID if the given value is not nil.
+func (_c *GroupCreate) SetNillableAdminID(id *int) *GroupCreate {
+	if id != nil {
+		_c = _c.SetAdminID(*id)
+	}
+	return _c
+}
+
+// SetAdmin sets the "admin" edge to the User entity.
+func (_c *GroupCreate) SetAdmin(v *User) *GroupCreate {
+	return _c.SetAdminID(v.ID)
+}
+
+// Mutation returns the GroupMutation object of the builder.
+func (_c *GroupCreate) Mutation() *GroupMutation {
+	return _c.mutation
+}
+
+// Save creates the Group in the database.
+func (_c *GroupCreate) Save(ctx context.Context) (*Group, error) {
+	return withHooks(ctx, _c.sqlSave, _c.mutation, _c.hooks)
+}
+
+// SaveX calls Save and panics if Save returns an error.
+func (_c *GroupCreate) SaveX(ctx context.Context) *Group {
+	v, err := _c.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Exec executes the query.
+func (_c *GroupCreate) Exec(ctx context.Context) error {
+	_, err := _c.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_c *GroupCreate) ExecX(ctx context.Context) {
+	if err := _c.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
+
+// check runs all checks and user-defined validators on the builder.
+func (_c *GroupCreate) check() error {
+	if _, ok := _c.mutation.Name(); !ok {
+		return &ValidationError{Name: "name", err: errors.New(`ent: missing required field "Group.name"`)}
+	}
+	return nil
+}
+
+func (_c *GroupCreate) sqlSave(ctx context.Context) (*Group, error) {
+	if err := _c.check(); err != nil {
+		return nil, err
+	}
+	_node, _spec := _c.createSpec()
+	if err := sqlgraph.CreateNode(ctx, _c.driver, _spec); err != nil {
+		if sqlgraph.IsConstraintError(err) {
+			err = &ConstraintError{msg: err.Error(), wrap: err}
+		}
+		return nil, err
+	}
+	id := _spec.ID.Value.(int64)
+	_node.ID = int(id)
+	_c.mutation.id = &_node.ID
+	_c.mutation.done = true
+	return _node, nil
+}
+
+func (_c *GroupCreate) createSpec() (*Group, *sqlgraph.CreateSpec) {
+	var (
+		_node = &Group{config: _c.config}
+		_spec = sqlgraph.NewCreateSpec(group.Table, sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt))
+	)
+	if value, ok := _c.mutation.Name(); ok {
+		_spec.SetField(group.FieldName, field.TypeString, value)
+		_node.Name = value
+	}
+	if nodes := _c.mutation.UsersIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   group.UsersTable,
+			Columns: group.UsersPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges = append(_spec.Edges, edge)
+	}
+	if nodes := _c.mutation.AdminIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2O,
+			Inverse: false,
+			Table:   group.AdminTable,
+			Columns: []string{group.AdminColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_node.group_admin = &nodes[0]
+		_spec.Edges = append(_spec.Edges, edge)
+	}
+	return _node, _spec
+}
+
+// GroupCreateBulk is the builder for creating many Group entities in bulk.
+type GroupCreateBulk struct {
+	config
+	err      error
+	builders []*GroupCreate
+}
+
+// Save creates the Group entities in the database.
+func (_c *GroupCreateBulk) Save(ctx context.Context) ([]*Group, error) {
+	if _c.err != nil {
+		return nil, _c.err
+	}
+	specs := make([]*sqlgraph.CreateSpec, len(_c.builders))
+	nodes := make([]*Group, len(_c.builders))
+	mutators := make([]Mutator, len(_c.builders))
+	for i := range _c.builders {
+		func(i int, root context.Context) {
+			builder := _c.builders[i]
+			var mut Mutator = MutateFunc(func(ctx context.Context, m Mutation) (Value, error) {
+				mutation, ok := m.(*GroupMutation)
+				if !ok {
+					return nil, fmt.Errorf("unexpected mutation type %T", m)
+				}
+				if err := builder.check(); err != nil {
+					return nil, err
+				}
+				builder.mutation = mutation
+				var err error
+				nodes[i], specs[i] = builder.createSpec()
+				if i < len(mutators)-1 {
+					_, err = mutators[i+1].Mutate(root, _c.builders[i+1].mutation)
+				} else {
+					spec := &sqlgraph.BatchCreateSpec{Nodes: specs}
+					// Invoke the actual operation on the latest mutation in the chain.
+					if err = sqlgraph.BatchCreate(ctx, _c.driver, spec); err != nil {
+						if sqlgraph.IsConstraintError(err) {
+							err = &ConstraintError{msg: err.Error(), wrap: err}
+						}
+					}
+				}
+				if err != nil {
+					return nil, err
+				}
+				mutation.id = &nodes[i].ID
+				if specs[i].ID.Value != nil {
+					id := specs[i].ID.Value.(int64)
+					nodes[i].ID = int(id)
+				}
+				mutation.done = true
+				return nodes[i], nil
+			})
+			for i := len(builder.hooks) - 1; i >= 0; i-- {
+				mut = builder.hooks[i](mut)
+			}
+			mutators[i] = mut
+		}(i, ctx)
+	}
+	if len(mutators) > 0 {
+		if _, err := mutators[0].Mutate(ctx, _c.builders[0].mutation); err != nil {
+			return nil, err
+		}
+	}
+	return nodes, nil
+}
+
+// SaveX is like Save, but panics if an error occurs.
+func (_c *GroupCreateBulk) SaveX(ctx context.Context) []*Group {
+	v, err := _c.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Exec executes the query.
+func (_c *GroupCreateBulk) Exec(ctx context.Context) error {
+	_, err := _c.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_c *GroupCreateBulk) ExecX(ctx context.Context) {
+	if err := _c.Exec(ctx); err != nil {
+		panic(err)
+	}
+}

examples/traversal/ent/group_delete.go

@@ -0,0 +1,92 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/group"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+	"entgo.io/ent/schema/field"
+)
+
+// GroupDelete is the builder for deleting a Group entity.
+type GroupDelete struct {
+	config
+	hooks    []Hook
+	mutation *GroupMutation
+}
+
+// Where appends a list predicates to the GroupDelete builder.
+func (_d *GroupDelete) Where(ps ...predicate.Group) *GroupDelete {
+	_d.mutation.Where(ps...)
+	return _d
+}
+
+// Exec executes the deletion query and returns how many vertices were deleted.
+func (_d *GroupDelete) Exec(ctx context.Context) (int, error) {
+	return withHooks(ctx, _d.sqlExec, _d.mutation, _d.hooks)
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_d *GroupDelete) ExecX(ctx context.Context) int {
+	n, err := _d.Exec(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}
+
+func (_d *GroupDelete) sqlExec(ctx context.Context) (int, error) {
+	_spec := sqlgraph.NewDeleteSpec(group.Table, sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt))
+	if ps := _d.mutation.Predicates(); len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	affected, err := sqlgraph.DeleteNodes(ctx, _d.driver, _spec)
+	if err != nil && sqlgraph.IsConstraintError(err) {
+		err = &ConstraintError{msg: err.Error(), wrap: err}
+	}
+	_d.mutation.done = true
+	return affected, err
+}
+
+// GroupDeleteOne is the builder for deleting a single Group entity.
+type GroupDeleteOne struct {
+	_d *GroupDelete
+}
+
+// Where appends a list predicates to the GroupDelete builder.
+func (_d *GroupDeleteOne) Where(ps ...predicate.Group) *GroupDeleteOne {
+	_d._d.mutation.Where(ps...)
+	return _d
+}
+
+// Exec executes the deletion query.
+func (_d *GroupDeleteOne) Exec(ctx context.Context) error {
+	n, err := _d._d.Exec(ctx)
+	switch {
+	case err != nil:
+		return err
+	case n == 0:
+		return &NotFoundError{group.Label}
+	default:
+		return nil
+	}
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_d *GroupDeleteOne) ExecX(ctx context.Context) {
+	if err := _d.Exec(ctx); err != nil {
+		panic(err)
+	}
+}

examples/traversal/ent/group_query.go

@@ -0,0 +1,723 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"database/sql/driver"
+	"fmt"
+	"math"
+
+	"entgo.io/ent"
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/group"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+	"entgo.io/ent/examples/traversal/ent/user"
+	"entgo.io/ent/schema/field"
+)
+
+// GroupQuery is the builder for querying Group entities.
+type GroupQuery struct {
+	config
+	ctx        *QueryContext
+	order      []group.OrderOption
+	inters     []Interceptor
+	predicates []predicate.Group
+	withUsers  *UserQuery
+	withAdmin  *UserQuery
+	withFKs    bool
+	// intermediate query (i.e. traversal path).
+	sql  *sql.Selector
+	path func(context.Context) (*sql.Selector, error)
+}
+
+// Where adds a new predicate for the GroupQuery builder.
+func (_q *GroupQuery) Where(ps ...predicate.Group) *GroupQuery {
+	_q.predicates = append(_q.predicates, ps...)
+	return _q
+}
+
+// Limit the number of records to be returned by this query.
+func (_q *GroupQuery) Limit(limit int) *GroupQuery {
+	_q.ctx.Limit = &limit
+	return _q
+}
+
+// Offset to start from.
+func (_q *GroupQuery) Offset(offset int) *GroupQuery {
+	_q.ctx.Offset = &offset
+	return _q
+}
+
+// Unique configures the query builder to filter duplicate records on query.
+// By default, unique is set to true, and can be disabled using this method.
+func (_q *GroupQuery) Unique(unique bool) *GroupQuery {
+	_q.ctx.Unique = &unique
+	return _q
+}
+
+// Order specifies how the records should be ordered.
+func (_q *GroupQuery) Order(o ...group.OrderOption) *GroupQuery {
+	_q.order = append(_q.order, o...)
+	return _q
+}
+
+// QueryUsers chains the current query on the "users" edge.
+func (_q *GroupQuery) QueryUsers() *UserQuery {
+	query := (&UserClient{config: _q.config}).Query()
+	query.path = func(ctx context.Context) (fromU *sql.Selector, err error) {
+		if err := _q.prepareQuery(ctx); err != nil {
+			return nil, err
+		}
+		selector := _q.sqlQuery(ctx)
+		if err := selector.Err(); err != nil {
+			return nil, err
+		}
+		step := sqlgraph.NewStep(
+			sqlgraph.From(group.Table, group.FieldID, selector),
+			sqlgraph.To(user.Table, user.FieldID),
+			sqlgraph.Edge(sqlgraph.M2M, false, group.UsersTable, group.UsersPrimaryKey...),
+		)
+		fromU = sqlgraph.SetNeighbors(_q.driver.Dialect(), step)
+		return fromU, nil
+	}
+	return query
+}
+
+// QueryAdmin chains the current query on the "admin" edge.
+func (_q *GroupQuery) QueryAdmin() *UserQuery {
+	query := (&UserClient{config: _q.config}).Query()
+	query.path = func(ctx context.Context) (fromU *sql.Selector, err error) {
+		if err := _q.prepareQuery(ctx); err != nil {
+			return nil, err
+		}
+		selector := _q.sqlQuery(ctx)
+		if err := selector.Err(); err != nil {
+			return nil, err
+		}
+		step := sqlgraph.NewStep(
+			sqlgraph.From(group.Table, group.FieldID, selector),
+			sqlgraph.To(user.Table, user.FieldID),
+			sqlgraph.Edge(sqlgraph.M2O, false, group.AdminTable, group.AdminColumn),
+		)
+		fromU = sqlgraph.SetNeighbors(_q.driver.Dialect(), step)
+		return fromU, nil
+	}
+	return query
+}
+
+// First returns the first Group entity from the query.
+// Returns a *NotFoundError when no Group was found.
+func (_q *GroupQuery) First(ctx context.Context) (*Group, error) {
+	nodes, err := _q.Limit(1).All(setContextOp(ctx, _q.ctx, ent.OpQueryFirst))
+	if err != nil {
+		return nil, err
+	}
+	if len(nodes) == 0 {
+		return nil, &NotFoundError{group.Label}
+	}
+	return nodes[0], nil
+}
+
+// FirstX is like First, but panics if an error occurs.
+func (_q *GroupQuery) FirstX(ctx context.Context) *Group {
+	node, err := _q.First(ctx)
+	if err != nil && !IsNotFound(err) {
+		panic(err)
+	}
+	return node
+}
+
+// FirstID returns the first Group ID from the query.
+// Returns a *NotFoundError when no Group ID was found.
+func (_q *GroupQuery) FirstID(ctx context.Context) (id int, err error) {
+	var ids []int
+	if ids, err = _q.Limit(1).IDs(setContextOp(ctx, _q.ctx, ent.OpQueryFirstID)); err != nil {
+		return
+	}
+	if len(ids) == 0 {
+		err = &NotFoundError{group.Label}
+		return
+	}
+	return ids[0], nil
+}
+
+// FirstIDX is like FirstID, but panics if an error occurs.
+func (_q *GroupQuery) FirstIDX(ctx context.Context) int {
+	id, err := _q.FirstID(ctx)
+	if err != nil && !IsNotFound(err) {
+		panic(err)
+	}
+	return id
+}
+
+// Only returns a single Group entity found by the query, ensuring it only returns one.
+// Returns a *NotSingularError when more than one Group entity is found.
+// Returns a *NotFoundError when no Group entities are found.
+func (_q *GroupQuery) Only(ctx context.Context) (*Group, error) {
+	nodes, err := _q.Limit(2).All(setContextOp(ctx, _q.ctx, ent.OpQueryOnly))
+	if err != nil {
+		return nil, err
+	}
+	switch len(nodes) {
+	case 1:
+		return nodes[0], nil
+	case 0:
+		return nil, &NotFoundError{group.Label}
+	default:
+		return nil, &NotSingularError{group.Label}
+	}
+}
+
+// OnlyX is like Only, but panics if an error occurs.
+func (_q *GroupQuery) OnlyX(ctx context.Context) *Group {
+	node, err := _q.Only(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return node
+}
+
+// OnlyID is like Only, but returns the only Group ID in the query.
+// Returns a *NotSingularError when more than one Group ID is found.
+// Returns a *NotFoundError when no entities are found.
+func (_q *GroupQuery) OnlyID(ctx context.Context) (id int, err error) {
+	var ids []int
+	if ids, err = _q.Limit(2).IDs(setContextOp(ctx, _q.ctx, ent.OpQueryOnlyID)); err != nil {
+		return
+	}
+	switch len(ids) {
+	case 1:
+		id = ids[0]
+	case 0:
+		err = &NotFoundError{group.Label}
+	default:
+		err = &NotSingularError{group.Label}
+	}
+	return
+}
+
+// OnlyIDX is like OnlyID, but panics if an error occurs.
+func (_q *GroupQuery) OnlyIDX(ctx context.Context) int {
+	id, err := _q.OnlyID(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return id
+}
+
+// All executes the query and returns a list of Groups.
+func (_q *GroupQuery) All(ctx context.Context) ([]*Group, error) {
+	ctx = setContextOp(ctx, _q.ctx, ent.OpQueryAll)
+	if err := _q.prepareQuery(ctx); err != nil {
+		return nil, err
+	}
+	qr := querierAll[[]*Group, *GroupQuery]()
+	return withInterceptors[[]*Group](ctx, _q, qr, _q.inters)
+}
+
+// AllX is like All, but panics if an error occurs.
+func (_q *GroupQuery) AllX(ctx context.Context) []*Group {
+	nodes, err := _q.All(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return nodes
+}
+
+// IDs executes the query and returns a list of Group IDs.
+func (_q *GroupQuery) IDs(ctx context.Context) (ids []int, err error) {
+	if _q.ctx.Unique == nil && _q.path != nil {
+		_q.Unique(true)
+	}
+	ctx = setContextOp(ctx, _q.ctx, ent.OpQueryIDs)
+	if err = _q.Select(group.FieldID).Scan(ctx, &ids); err != nil {
+		return nil, err
+	}
+	return ids, nil
+}
+
+// IDsX is like IDs, but panics if an error occurs.
+func (_q *GroupQuery) IDsX(ctx context.Context) []int {
+	ids, err := _q.IDs(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return ids
+}
+
+// Count returns the count of the given query.
+func (_q *GroupQuery) Count(ctx context.Context) (int, error) {
+	ctx = setContextOp(ctx, _q.ctx, ent.OpQueryCount)
+	if err := _q.prepareQuery(ctx); err != nil {
+		return 0, err
+	}
+	return withInterceptors[int](ctx, _q, querierCount[*GroupQuery](), _q.inters)
+}
+
+// CountX is like Count, but panics if an error occurs.
+func (_q *GroupQuery) CountX(ctx context.Context) int {
+	count, err := _q.Count(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return count
+}
+
+// Exist returns true if the query has elements in the graph.
+func (_q *GroupQuery) Exist(ctx context.Context) (bool, error) {
+	ctx = setContextOp(ctx, _q.ctx, ent.OpQueryExist)
+	switch _, err := _q.FirstID(ctx); {
+	case IsNotFound(err):
+		return false, nil
+	case err != nil:
+		return false, fmt.Errorf("ent: check existence: %w", err)
+	default:
+		return true, nil
+	}
+}
+
+// ExistX is like Exist, but panics if an error occurs.
+func (_q *GroupQuery) ExistX(ctx context.Context) bool {
+	exist, err := _q.Exist(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return exist
+}
+
+// Clone returns a duplicate of the GroupQuery builder, including all associated steps. It can be
+// used to prepare common query builders and use them differently after the clone is made.
+func (_q *GroupQuery) Clone() *GroupQuery {
+	if _q == nil {
+		return nil
+	}
+	return &GroupQuery{
+		config:     _q.config,
+		ctx:        _q.ctx.Clone(),
+		order:      append([]group.OrderOption{}, _q.order...),
+		inters:     append([]Interceptor{}, _q.inters...),
+		predicates: append([]predicate.Group{}, _q.predicates...),
+		withUsers:  _q.withUsers.Clone(),
+		withAdmin:  _q.withAdmin.Clone(),
+		// clone intermediate query.
+		sql:  _q.sql.Clone(),
+		path: _q.path,
+	}
+}
+
+// WithUsers tells the query-builder to eager-load the nodes that are connected to
+// the "users" edge. The optional arguments are used to configure the query builder of the edge.
+func (_q *GroupQuery) WithUsers(opts ...func(*UserQuery)) *GroupQuery {
+	query := (&UserClient{config: _q.config}).Query()
+	for _, opt := range opts {
+		opt(query)
+	}
+	_q.withUsers = query
+	return _q
+}
+
+// WithAdmin tells the query-builder to eager-load the nodes that are connected to
+// the "admin" edge. The optional arguments are used to configure the query builder of the edge.
+func (_q *GroupQuery) WithAdmin(opts ...func(*UserQuery)) *GroupQuery {
+	query := (&UserClient{config: _q.config}).Query()
+	for _, opt := range opts {
+		opt(query)
+	}
+	_q.withAdmin = query
+	return _q
+}
+
+// GroupBy is used to group vertices by one or more fields/columns.
+// It is often used with aggregate functions, like: count, max, mean, min, sum.
+//
+// Example:
+//
+//	var v []struct {
+//		Name string `json:"name,omitempty"`
+//		Count int `json:"count,omitempty"`
+//	}
+//
+//	client.Group.Query().
+//		GroupBy(group.FieldName).
+//		Aggregate(ent.Count()).
+//		Scan(ctx, &v)
+func (_q *GroupQuery) GroupBy(field string, fields ...string) *GroupGroupBy {
+	_q.ctx.Fields = append([]string{field}, fields...)
+	grbuild := &GroupGroupBy{build: _q}
+	grbuild.flds = &_q.ctx.Fields
+	grbuild.label = group.Label
+	grbuild.scan = grbuild.Scan
+	return grbuild
+}
+
+// Select allows the selection one or more fields/columns for the given query,
+// instead of selecting all fields in the entity.
+//
+// Example:
+//
+//	var v []struct {
+//		Name string `json:"name,omitempty"`
+//	}
+//
+//	client.Group.Query().
+//		Select(group.FieldName).
+//		Scan(ctx, &v)
+func (_q *GroupQuery) Select(fields ...string) *GroupSelect {
+	_q.ctx.Fields = append(_q.ctx.Fields, fields...)
+	sbuild := &GroupSelect{GroupQuery: _q}
+	sbuild.label = group.Label
+	sbuild.flds, sbuild.scan = &_q.ctx.Fields, sbuild.Scan
+	return sbuild
+}
+
+// Aggregate returns a GroupSelect configured with the given aggregations.
+func (_q *GroupQuery) Aggregate(fns ...AggregateFunc) *GroupSelect {
+	return _q.Select().Aggregate(fns...)
+}
+
+func (_q *GroupQuery) prepareQuery(ctx context.Context) error {
+	for _, inter := range _q.inters {
+		if inter == nil {
+			return fmt.Errorf("ent: uninitialized interceptor (forgotten import ent/runtime?)")
+		}
+		if trv, ok := inter.(Traverser); ok {
+			if err := trv.Traverse(ctx, _q); err != nil {
+				return err
+			}
+		}
+	}
+	for _, f := range _q.ctx.Fields {
+		if !group.ValidColumn(f) {
+			return &ValidationError{Name: f, err: fmt.Errorf("ent: invalid field %q for query", f)}
+		}
+	}
+	if _q.path != nil {
+		prev, err := _q.path(ctx)
+		if err != nil {
+			return err
+		}
+		_q.sql = prev
+	}
+	return nil
+}
+
+func (_q *GroupQuery) sqlAll(ctx context.Context, hooks ...queryHook) ([]*Group, error) {
+	var (
+		nodes       = []*Group{}
+		withFKs     = _q.withFKs
+		_spec       = _q.querySpec()
+		loadedTypes = [2]bool{
+			_q.withUsers != nil,
+			_q.withAdmin != nil,
+		}
+	)
+	if _q.withAdmin != nil {
+		withFKs = true
+	}
+	if withFKs {
+		_spec.Node.Columns = append(_spec.Node.Columns, group.ForeignKeys...)
+	}
+	_spec.ScanValues = func(columns []string) ([]any, error) {
+		return (*Group).scanValues(nil, columns)
+	}
+	_spec.Assign = func(columns []string, values []any) error {
+		node := &Group{config: _q.config}
+		nodes = append(nodes, node)
+		node.Edges.loadedTypes = loadedTypes
+		return node.assignValues(columns, values)
+	}
+	for i := range hooks {
+		hooks[i](ctx, _spec)
+	}
+	if err := sqlgraph.QueryNodes(ctx, _q.driver, _spec); err != nil {
+		return nil, err
+	}
+	if len(nodes) == 0 {
+		return nodes, nil
+	}
+	if query := _q.withUsers; query != nil {
+		if err := _q.loadUsers(ctx, query, nodes,
+			func(n *Group) { n.Edges.Users = []*User{} },
+			func(n *Group, e *User) { n.Edges.Users = append(n.Edges.Users, e) }); err != nil {
+			return nil, err
+		}
+	}
+	if query := _q.withAdmin; query != nil {
+		if err := _q.loadAdmin(ctx, query, nodes, nil,
+			func(n *Group, e *User) { n.Edges.Admin = e }); err != nil {
+			return nil, err
+		}
+	}
+	return nodes, nil
+}
+
+func (_q *GroupQuery) loadUsers(ctx context.Context, query *UserQuery, nodes []*Group, init func(*Group), assign func(*Group, *User)) error {
+	edgeIDs := make([]driver.Value, len(nodes))
+	byID := make(map[int]*Group)
+	nids := make(map[int]map[*Group]struct{})
+	for i, node := range nodes {
+		edgeIDs[i] = node.ID
+		byID[node.ID] = node
+		if init != nil {
+			init(node)
+		}
+	}
+	query.Where(func(s *sql.Selector) {
+		joinT := sql.Table(group.UsersTable)
+		s.Join(joinT).On(s.C(user.FieldID), joinT.C(group.UsersPrimaryKey[1]))
+		s.Where(sql.InValues(joinT.C(group.UsersPrimaryKey[0]), edgeIDs...))
+		columns := s.SelectedColumns()
+		s.Select(joinT.C(group.UsersPrimaryKey[0]))
+		s.AppendSelect(columns...)
+		s.SetDistinct(false)
+	})
+	if err := query.prepareQuery(ctx); err != nil {
+		return err
+	}
+	qr := QuerierFunc(func(ctx context.Context, q Query) (Value, error) {
+		return query.sqlAll(ctx, func(_ context.Context, spec *sqlgraph.QuerySpec) {
+			assign := spec.Assign
+			values := spec.ScanValues
+			spec.ScanValues = func(columns []string) ([]any, error) {
+				values, err := values(columns[1:])
+				if err != nil {
+					return nil, err
+				}
+				return append([]any{new(sql.NullInt64)}, values...), nil
+			}
+			spec.Assign = func(columns []string, values []any) error {
+				outValue := int(values[0].(*sql.NullInt64).Int64)
+				inValue := int(values[1].(*sql.NullInt64).Int64)
+				if nids[inValue] == nil {
+					nids[inValue] = map[*Group]struct{}{byID[outValue]: {}}
+					return assign(columns[1:], values[1:])
+				}
+				nids[inValue][byID[outValue]] = struct{}{}
+				return nil
+			}
+		})
+	})
+	neighbors, err := withInterceptors[[]*User](ctx, query, qr, query.inters)
+	if err != nil {
+		return err
+	}
+	for _, n := range neighbors {
+		nodes, ok := nids[n.ID]
+		if !ok {
+			return fmt.Errorf(`unexpected "users" node returned %v`, n.ID)
+		}
+		for kn := range nodes {
+			assign(kn, n)
+		}
+	}
+	return nil
+}
+func (_q *GroupQuery) loadAdmin(ctx context.Context, query *UserQuery, nodes []*Group, init func(*Group), assign func(*Group, *User)) error {
+	ids := make([]int, 0, len(nodes))
+	nodeids := make(map[int][]*Group)
+	for i := range nodes {
+		if nodes[i].group_admin == nil {
+			continue
+		}
+		fk := *nodes[i].group_admin
+		if _, ok := nodeids[fk]; !ok {
+			ids = append(ids, fk)
+		}
+		nodeids[fk] = append(nodeids[fk], nodes[i])
+	}
+	if len(ids) == 0 {
+		return nil
+	}
+	query.Where(user.IDIn(ids...))
+	neighbors, err := query.All(ctx)
+	if err != nil {
+		return err
+	}
+	for _, n := range neighbors {
+		nodes, ok := nodeids[n.ID]
+		if !ok {
+			return fmt.Errorf(`unexpected foreign-key "group_admin" returned %v`, n.ID)
+		}
+		for i := range nodes {
+			assign(nodes[i], n)
+		}
+	}
+	return nil
+}
+
+func (_q *GroupQuery) sqlCount(ctx context.Context) (int, error) {
+	_spec := _q.querySpec()
+	_spec.Node.Columns = _q.ctx.Fields
+	if len(_q.ctx.Fields) > 0 {
+		_spec.Unique = _q.ctx.Unique != nil && *_q.ctx.Unique
+	}
+	return sqlgraph.CountNodes(ctx, _q.driver, _spec)
+}
+
+func (_q *GroupQuery) querySpec() *sqlgraph.QuerySpec {
+	_spec := sqlgraph.NewQuerySpec(group.Table, group.Columns, sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt))
+	_spec.From = _q.sql
+	if unique := _q.ctx.Unique; unique != nil {
+		_spec.Unique = *unique
+	} else if _q.path != nil {
+		_spec.Unique = true
+	}
+	if fields := _q.ctx.Fields; len(fields) > 0 {
+		_spec.Node.Columns = make([]string, 0, len(fields))
+		_spec.Node.Columns = append(_spec.Node.Columns, group.FieldID)
+		for i := range fields {
+			if fields[i] != group.FieldID {
+				_spec.Node.Columns = append(_spec.Node.Columns, fields[i])
+			}
+		}
+	}
+	if ps := _q.predicates; len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	if limit := _q.ctx.Limit; limit != nil {
+		_spec.Limit = *limit
+	}
+	if offset := _q.ctx.Offset; offset != nil {
+		_spec.Offset = *offset
+	}
+	if ps := _q.order; len(ps) > 0 {
+		_spec.Order = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	return _spec
+}
+
+func (_q *GroupQuery) sqlQuery(ctx context.Context) *sql.Selector {
+	builder := sql.Dialect(_q.driver.Dialect())
+	t1 := builder.Table(group.Table)
+	columns := _q.ctx.Fields
+	if len(columns) == 0 {
+		columns = group.Columns
+	}
+	selector := builder.Select(t1.Columns(columns...)...).From(t1)
+	if _q.sql != nil {
+		selector = _q.sql
+		selector.Select(selector.Columns(columns...)...)
+	}
+	if _q.ctx.Unique != nil && *_q.ctx.Unique {
+		selector.Distinct()
+	}
+	for _, p := range _q.predicates {
+		p(selector)
+	}
+	for _, p := range _q.order {
+		p(selector)
+	}
+	if offset := _q.ctx.Offset; offset != nil {
+		// limit is mandatory for offset clause. We start
+		// with default value, and override it below if needed.
+		selector.Offset(*offset).Limit(math.MaxInt32)
+	}
+	if limit := _q.ctx.Limit; limit != nil {
+		selector.Limit(*limit)
+	}
+	return selector
+}
+
+// GroupGroupBy is the group-by builder for Group entities.
+type GroupGroupBy struct {
+	selector
+	build *GroupQuery
+}
+
+// Aggregate adds the given aggregation functions to the group-by query.
+func (_g *GroupGroupBy) Aggregate(fns ...AggregateFunc) *GroupGroupBy {
+	_g.fns = append(_g.fns, fns...)
+	return _g
+}
+
+// Scan applies the selector query and scans the result into the given value.
+func (_g *GroupGroupBy) Scan(ctx context.Context, v any) error {
+	ctx = setContextOp(ctx, _g.build.ctx, ent.OpQueryGroupBy)
+	if err := _g.build.prepareQuery(ctx); err != nil {
+		return err
+	}
+	return scanWithInterceptors[*GroupQuery, *GroupGroupBy](ctx, _g.build, _g, _g.build.inters, v)
+}
+
+func (_g *GroupGroupBy) sqlScan(ctx context.Context, root *GroupQuery, v any) error {
+	selector := root.sqlQuery(ctx).Select()
+	aggregation := make([]string, 0, len(_g.fns))
+	for _, fn := range _g.fns {
+		aggregation = append(aggregation, fn(selector))
+	}
+	if len(selector.SelectedColumns()) == 0 {
+		columns := make([]string, 0, len(*_g.flds)+len(_g.fns))
+		for _, f := range *_g.flds {
+			columns = append(columns, selector.C(f))
+		}
+		columns = append(columns, aggregation...)
+		selector.Select(columns...)
+	}
+	selector.GroupBy(selector.Columns(*_g.flds...)...)
+	if err := selector.Err(); err != nil {
+		return err
+	}
+	rows := &sql.Rows{}
+	query, args := selector.Query()
+	if err := _g.build.driver.Query(ctx, query, args, rows); err != nil {
+		return err
+	}
+	defer rows.Close()
+	return sql.ScanSlice(rows, v)
+}
+
+// GroupSelect is the builder for selecting fields of Group entities.
+type GroupSelect struct {
+	*GroupQuery
+	selector
+}
+
+// Aggregate adds the given aggregation functions to the selector query.
+func (_s *GroupSelect) Aggregate(fns ...AggregateFunc) *GroupSelect {
+	_s.fns = append(_s.fns, fns...)
+	return _s
+}
+
+// Scan applies the selector query and scans the result into the given value.
+func (_s *GroupSelect) Scan(ctx context.Context, v any) error {
+	ctx = setContextOp(ctx, _s.ctx, ent.OpQuerySelect)
+	if err := _s.prepareQuery(ctx); err != nil {
+		return err
+	}
+	return scanWithInterceptors[*GroupQuery, *GroupSelect](ctx, _s.GroupQuery, _s, _s.inters, v)
+}
+
+func (_s *GroupSelect) sqlScan(ctx context.Context, root *GroupQuery, v any) error {
+	selector := root.sqlQuery(ctx)
+	aggregation := make([]string, 0, len(_s.fns))
+	for _, fn := range _s.fns {
+		aggregation = append(aggregation, fn(selector))
+	}
+	switch n := len(*_s.selector.flds); {
+	case n == 0 && len(aggregation) > 0:
+		selector.Select(aggregation...)
+	case n != 0 && len(aggregation) > 0:
+		selector.AppendSelect(aggregation...)
+	}
+	rows := &sql.Rows{}
+	query, args := selector.Query()
+	if err := _s.driver.Query(ctx, query, args, rows); err != nil {
+		return err
+	}
+	defer rows.Close()
+	return sql.ScanSlice(rows, v)
+}

examples/traversal/ent/group_update.go

@@ -0,0 +1,484 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/group"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+	"entgo.io/ent/examples/traversal/ent/user"
+	"entgo.io/ent/schema/field"
+)
+
+// GroupUpdate is the builder for updating Group entities.
+type GroupUpdate struct {
+	config
+	hooks    []Hook
+	mutation *GroupMutation
+}
+
+// Where appends a list predicates to the GroupUpdate builder.
+func (_u *GroupUpdate) Where(ps ...predicate.Group) *GroupUpdate {
+	_u.mutation.Where(ps...)
+	return _u
+}
+
+// SetName sets the "name" field.
+func (_u *GroupUpdate) SetName(v string) *GroupUpdate {
+	_u.mutation.SetName(v)
+	return _u
+}
+
+// SetNillableName sets the "name" field if the given value is not nil.
+func (_u *GroupUpdate) SetNillableName(v *string) *GroupUpdate {
+	if v != nil {
+		_u.SetName(*v)
+	}
+	return _u
+}
+
+// AddUserIDs adds the "users" edge to the User entity by IDs.
+func (_u *GroupUpdate) AddUserIDs(ids ...int) *GroupUpdate {
+	_u.mutation.AddUserIDs(ids...)
+	return _u
+}
+
+// AddUsers adds the "users" edges to the User entity.
+func (_u *GroupUpdate) AddUsers(v ...*User) *GroupUpdate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.AddUserIDs(ids...)
+}
+
+// SetAdminID sets the "admin" edge to the User entity by ID.
+func (_u *GroupUpdate) SetAdminID(id int) *GroupUpdate {
+	_u.mutation.SetAdminID(id)
+	return _u
+}
+
+// SetNillableAdminID sets the "admin" edge to the User entity by ID if the given value is not nil.
+func (_u *GroupUpdate) SetNillableAdminID(id *int) *GroupUpdate {
+	if id != nil {
+		_u = _u.SetAdminID(*id)
+	}
+	return _u
+}
+
+// SetAdmin sets the "admin" edge to the User entity.
+func (_u *GroupUpdate) SetAdmin(v *User) *GroupUpdate {
+	return _u.SetAdminID(v.ID)
+}
+
+// Mutation returns the GroupMutation object of the builder.
+func (_u *GroupUpdate) Mutation() *GroupMutation {
+	return _u.mutation
+}
+
+// ClearUsers clears all "users" edges to the User entity.
+func (_u *GroupUpdate) ClearUsers() *GroupUpdate {
+	_u.mutation.ClearUsers()
+	return _u
+}
+
+// RemoveUserIDs removes the "users" edge to User entities by IDs.
+func (_u *GroupUpdate) RemoveUserIDs(ids ...int) *GroupUpdate {
+	_u.mutation.RemoveUserIDs(ids...)
+	return _u
+}
+
+// RemoveUsers removes "users" edges to User entities.
+func (_u *GroupUpdate) RemoveUsers(v ...*User) *GroupUpdate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.RemoveUserIDs(ids...)
+}
+
+// ClearAdmin clears the "admin" edge to the User entity.
+func (_u *GroupUpdate) ClearAdmin() *GroupUpdate {
+	_u.mutation.ClearAdmin()
+	return _u
+}
+
+// Save executes the query and returns the number of nodes affected by the update operation.
+func (_u *GroupUpdate) Save(ctx context.Context) (int, error) {
+	return withHooks(ctx, _u.sqlSave, _u.mutation, _u.hooks)
+}
+
+// SaveX is like Save, but panics if an error occurs.
+func (_u *GroupUpdate) SaveX(ctx context.Context) int {
+	affected, err := _u.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return affected
+}
+
+// Exec executes the query.
+func (_u *GroupUpdate) Exec(ctx context.Context) error {
+	_, err := _u.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_u *GroupUpdate) ExecX(ctx context.Context) {
+	if err := _u.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
+
+func (_u *GroupUpdate) sqlSave(ctx context.Context) (_node int, err error) {
+	_spec := sqlgraph.NewUpdateSpec(group.Table, group.Columns, sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt))
+	if ps := _u.mutation.Predicates(); len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	if value, ok := _u.mutation.Name(); ok {
+		_spec.SetField(group.FieldName, field.TypeString, value)
+	}
+	if _u.mutation.UsersCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   group.UsersTable,
+			Columns: group.UsersPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.RemovedUsersIDs(); len(nodes) > 0 && !_u.mutation.UsersCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   group.UsersTable,
+			Columns: group.UsersPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.UsersIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   group.UsersTable,
+			Columns: group.UsersPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	if _u.mutation.AdminCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2O,
+			Inverse: false,
+			Table:   group.AdminTable,
+			Columns: []string{group.AdminColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.AdminIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2O,
+			Inverse: false,
+			Table:   group.AdminTable,
+			Columns: []string{group.AdminColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	if _node, err = sqlgraph.UpdateNodes(ctx, _u.driver, _spec); err != nil {
+		if _, ok := err.(*sqlgraph.NotFoundError); ok {
+			err = &NotFoundError{group.Label}
+		} else if sqlgraph.IsConstraintError(err) {
+			err = &ConstraintError{msg: err.Error(), wrap: err}
+		}
+		return 0, err
+	}
+	_u.mutation.done = true
+	return _node, nil
+}
+
+// GroupUpdateOne is the builder for updating a single Group entity.
+type GroupUpdateOne struct {
+	config
+	fields   []string
+	hooks    []Hook
+	mutation *GroupMutation
+}
+
+// SetName sets the "name" field.
+func (_u *GroupUpdateOne) SetName(v string) *GroupUpdateOne {
+	_u.mutation.SetName(v)
+	return _u
+}
+
+// SetNillableName sets the "name" field if the given value is not nil.
+func (_u *GroupUpdateOne) SetNillableName(v *string) *GroupUpdateOne {
+	if v != nil {
+		_u.SetName(*v)
+	}
+	return _u
+}
+
+// AddUserIDs adds the "users" edge to the User entity by IDs.
+func (_u *GroupUpdateOne) AddUserIDs(ids ...int) *GroupUpdateOne {
+	_u.mutation.AddUserIDs(ids...)
+	return _u
+}
+
+// AddUsers adds the "users" edges to the User entity.
+func (_u *GroupUpdateOne) AddUsers(v ...*User) *GroupUpdateOne {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.AddUserIDs(ids...)
+}
+
+// SetAdminID sets the "admin" edge to the User entity by ID.
+func (_u *GroupUpdateOne) SetAdminID(id int) *GroupUpdateOne {
+	_u.mutation.SetAdminID(id)
+	return _u
+}
+
+// SetNillableAdminID sets the "admin" edge to the User entity by ID if the given value is not nil.
+func (_u *GroupUpdateOne) SetNillableAdminID(id *int) *GroupUpdateOne {
+	if id != nil {
+		_u = _u.SetAdminID(*id)
+	}
+	return _u
+}
+
+// SetAdmin sets the "admin" edge to the User entity.
+func (_u *GroupUpdateOne) SetAdmin(v *User) *GroupUpdateOne {
+	return _u.SetAdminID(v.ID)
+}
+
+// Mutation returns the GroupMutation object of the builder.
+func (_u *GroupUpdateOne) Mutation() *GroupMutation {
+	return _u.mutation
+}
+
+// ClearUsers clears all "users" edges to the User entity.
+func (_u *GroupUpdateOne) ClearUsers() *GroupUpdateOne {
+	_u.mutation.ClearUsers()
+	return _u
+}
+
+// RemoveUserIDs removes the "users" edge to User entities by IDs.
+func (_u *GroupUpdateOne) RemoveUserIDs(ids ...int) *GroupUpdateOne {
+	_u.mutation.RemoveUserIDs(ids...)
+	return _u
+}
+
+// RemoveUsers removes "users" edges to User entities.
+func (_u *GroupUpdateOne) RemoveUsers(v ...*User) *GroupUpdateOne {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.RemoveUserIDs(ids...)
+}
+
+// ClearAdmin clears the "admin" edge to the User entity.
+func (_u *GroupUpdateOne) ClearAdmin() *GroupUpdateOne {
+	_u.mutation.ClearAdmin()
+	return _u
+}
+
+// Where appends a list predicates to the GroupUpdate builder.
+func (_u *GroupUpdateOne) Where(ps ...predicate.Group) *GroupUpdateOne {
+	_u.mutation.Where(ps...)
+	return _u
+}
+
+// Select allows selecting one or more fields (columns) of the returned entity.
+// The default is selecting all fields defined in the entity schema.
+func (_u *GroupUpdateOne) Select(field string, fields ...string) *GroupUpdateOne {
+	_u.fields = append([]string{field}, fields...)
+	return _u
+}
+
+// Save executes the query and returns the updated Group entity.
+func (_u *GroupUpdateOne) Save(ctx context.Context) (*Group, error) {
+	return withHooks(ctx, _u.sqlSave, _u.mutation, _u.hooks)
+}
+
+// SaveX is like Save, but panics if an error occurs.
+func (_u *GroupUpdateOne) SaveX(ctx context.Context) *Group {
+	node, err := _u.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return node
+}
+
+// Exec executes the query on the entity.
+func (_u *GroupUpdateOne) Exec(ctx context.Context) error {
+	_, err := _u.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_u *GroupUpdateOne) ExecX(ctx context.Context) {
+	if err := _u.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
+
+func (_u *GroupUpdateOne) sqlSave(ctx context.Context) (_node *Group, err error) {
+	_spec := sqlgraph.NewUpdateSpec(group.Table, group.Columns, sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt))
+	id, ok := _u.mutation.ID()
+	if !ok {
+		return nil, &ValidationError{Name: "id", err: errors.New(`ent: missing "Group.id" for update`)}
+	}
+	_spec.Node.ID.Value = id
+	if fields := _u.fields; len(fields) > 0 {
+		_spec.Node.Columns = make([]string, 0, len(fields))
+		_spec.Node.Columns = append(_spec.Node.Columns, group.FieldID)
+		for _, f := range fields {
+			if !group.ValidColumn(f) {
+				return nil, &ValidationError{Name: f, err: fmt.Errorf("ent: invalid field %q for query", f)}
+			}
+			if f != group.FieldID {
+				_spec.Node.Columns = append(_spec.Node.Columns, f)
+			}
+		}
+	}
+	if ps := _u.mutation.Predicates(); len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	if value, ok := _u.mutation.Name(); ok {
+		_spec.SetField(group.FieldName, field.TypeString, value)
+	}
+	if _u.mutation.UsersCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   group.UsersTable,
+			Columns: group.UsersPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.RemovedUsersIDs(); len(nodes) > 0 && !_u.mutation.UsersCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   group.UsersTable,
+			Columns: group.UsersPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.UsersIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   group.UsersTable,
+			Columns: group.UsersPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	if _u.mutation.AdminCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2O,
+			Inverse: false,
+			Table:   group.AdminTable,
+			Columns: []string{group.AdminColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.AdminIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2O,
+			Inverse: false,
+			Table:   group.AdminTable,
+			Columns: []string{group.AdminColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	_node = &Group{config: _u.config}
+	_spec.Assign = _node.assignValues
+	_spec.ScanValues = _node.scanValues
+	if err = sqlgraph.UpdateNode(ctx, _u.driver, _spec); err != nil {
+		if _, ok := err.(*sqlgraph.NotFoundError); ok {
+			err = &NotFoundError{group.Label}
+		} else if sqlgraph.IsConstraintError(err) {
+			err = &ConstraintError{msg: err.Error(), wrap: err}
+		}
+		return nil, err
+	}
+	_u.mutation.done = true
+	return _node, nil
+}

examples/traversal/ent/hook/hook.go

@@ -0,0 +1,227 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package hook
+
+import (
+	"context"
+	"fmt"
+
+	"entgo.io/ent/examples/traversal/ent"
+)
+
+// The GroupFunc type is an adapter to allow the use of ordinary
+// function as Group mutator.
+type GroupFunc func(context.Context, *ent.GroupMutation) (ent.Value, error)
+
+// Mutate calls f(ctx, m).
+func (f GroupFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
+	if mv, ok := m.(*ent.GroupMutation); ok {
+		return f(ctx, mv)
+	}
+	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.GroupMutation", m)
+}
+
+// The PetFunc type is an adapter to allow the use of ordinary
+// function as Pet mutator.
+type PetFunc func(context.Context, *ent.PetMutation) (ent.Value, error)
+
+// Mutate calls f(ctx, m).
+func (f PetFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
+	if mv, ok := m.(*ent.PetMutation); ok {
+		return f(ctx, mv)
+	}
+	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.PetMutation", m)
+}
+
+// The UserFunc type is an adapter to allow the use of ordinary
+// function as User mutator.
+type UserFunc func(context.Context, *ent.UserMutation) (ent.Value, error)
+
+// Mutate calls f(ctx, m).
+func (f UserFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
+	if mv, ok := m.(*ent.UserMutation); ok {
+		return f(ctx, mv)
+	}
+	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.UserMutation", m)
+}
+
+// Condition is a hook condition function.
+type Condition func(context.Context, ent.Mutation) bool
+
+// And groups conditions with the AND operator.
+func And(first, second Condition, rest ...Condition) Condition {
+	return func(ctx context.Context, m ent.Mutation) bool {
+		if !first(ctx, m) || !second(ctx, m) {
+			return false
+		}
+		for _, cond := range rest {
+			if !cond(ctx, m) {
+				return false
+			}
+		}
+		return true
+	}
+}
+
+// Or groups conditions with the OR operator.
+func Or(first, second Condition, rest ...Condition) Condition {
+	return func(ctx context.Context, m ent.Mutation) bool {
+		if first(ctx, m) || second(ctx, m) {
+			return true
+		}
+		for _, cond := range rest {
+			if cond(ctx, m) {
+				return true
+			}
+		}
+		return false
+	}
+}
+
+// Not negates a given condition.
+func Not(cond Condition) Condition {
+	return func(ctx context.Context, m ent.Mutation) bool {
+		return !cond(ctx, m)
+	}
+}
+
+// HasOp is a condition testing mutation operation.
+func HasOp(op ent.Op) Condition {
+	return func(_ context.Context, m ent.Mutation) bool {
+		return m.Op().Is(op)
+	}
+}
+
+// HasAddedFields is a condition validating `.AddedField` on fields.
+func HasAddedFields(field string, fields ...string) Condition {
+	return func(_ context.Context, m ent.Mutation) bool {
+		if _, exists := m.AddedField(field); !exists {
+			return false
+		}
+		for _, field := range fields {
+			if _, exists := m.AddedField(field); !exists {
+				return false
+			}
+		}
+		return true
+	}
+}
+
+// HasClearedFields is a condition validating `.FieldCleared` on fields.
+func HasClearedFields(field string, fields ...string) Condition {
+	return func(_ context.Context, m ent.Mutation) bool {
+		if exists := m.FieldCleared(field); !exists {
+			return false
+		}
+		for _, field := range fields {
+			if exists := m.FieldCleared(field); !exists {
+				return false
+			}
+		}
+		return true
+	}
+}
+
+// HasFields is a condition validating `.Field` on fields.
+func HasFields(field string, fields ...string) Condition {
+	return func(_ context.Context, m ent.Mutation) bool {
+		if _, exists := m.Field(field); !exists {
+			return false
+		}
+		for _, field := range fields {
+			if _, exists := m.Field(field); !exists {
+				return false
+			}
+		}
+		return true
+	}
+}
+
+// If executes the given hook under condition.
+//
+//	hook.If(ComputeAverage, And(HasFields(...), HasAddedFields(...)))
+func If(hk ent.Hook, cond Condition) ent.Hook {
+	return func(next ent.Mutator) ent.Mutator {
+		return ent.MutateFunc(func(ctx context.Context, m ent.Mutation) (ent.Value, error) {
+			if cond(ctx, m) {
+				return hk(next).Mutate(ctx, m)
+			}
+			return next.Mutate(ctx, m)
+		})
+	}
+}
+
+// On executes the given hook only for the given operation.
+//
+//	hook.On(Log, ent.Delete|ent.Create)
+func On(hk ent.Hook, op ent.Op) ent.Hook {
+	return If(hk, HasOp(op))
+}
+
+// Unless skips the given hook only for the given operation.
+//
+//	hook.Unless(Log, ent.Update|ent.UpdateOne)
+func Unless(hk ent.Hook, op ent.Op) ent.Hook {
+	return If(hk, Not(HasOp(op)))
+}
+
+// FixedError is a hook returning a fixed error.
+func FixedError(err error) ent.Hook {
+	return func(ent.Mutator) ent.Mutator {
+		return ent.MutateFunc(func(context.Context, ent.Mutation) (ent.Value, error) {
+			return nil, err
+		})
+	}
+}
+
+// Reject returns a hook that rejects all operations that match op.
+//
+//	func (T) Hooks() []ent.Hook {
+//		return []ent.Hook{
+//			Reject(ent.Delete|ent.Update),
+//		}
+//	}
+func Reject(op ent.Op) ent.Hook {
+	hk := FixedError(fmt.Errorf("%s operation is not allowed", op))
+	return On(hk, op)
+}
+
+// Chain acts as a list of hooks and is effectively immutable.
+// Once created, it will always hold the same set of hooks in the same order.
+type Chain struct {
+	hooks []ent.Hook
+}
+
+// NewChain creates a new chain of hooks.
+func NewChain(hooks ...ent.Hook) Chain {
+	return Chain{append([]ent.Hook(nil), hooks...)}
+}
+
+// Hook chains the list of hooks and returns the final hook.
+func (c Chain) Hook() ent.Hook {
+	return func(mutator ent.Mutator) ent.Mutator {
+		for i := len(c.hooks) - 1; i >= 0; i-- {
+			mutator = c.hooks[i](mutator)
+		}
+		return mutator
+	}
+}
+
+// Append extends a chain, adding the specified hook
+// as the last ones in the mutation flow.
+func (c Chain) Append(hooks ...ent.Hook) Chain {
+	newHooks := make([]ent.Hook, 0, len(c.hooks)+len(hooks))
+	newHooks = append(newHooks, c.hooks...)
+	newHooks = append(newHooks, hooks...)
+	return Chain{newHooks}
+}
+
+// Extend extends a chain, adding the specified chain
+// as the last ones in the mutation flow.
+func (c Chain) Extend(chain Chain) Chain {
+	return c.Append(chain.hooks...)
+}

examples/traversal/ent/migrate/migrate.go

@@ -0,0 +1,68 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package migrate
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"entgo.io/ent/dialect"
+	"entgo.io/ent/dialect/sql/schema"
+)
+
+var (
+	// WithGlobalUniqueID sets the universal ids options to the migration.
+	// If this option is enabled, ent migration will allocate a 1<<32 range
+	// for the ids of each entity (table).
+	// Note that this option cannot be applied on tables that already exist.
+	WithGlobalUniqueID = schema.WithGlobalUniqueID
+	// WithDropColumn sets the drop column option to the migration.
+	// If this option is enabled, ent migration will drop old columns
+	// that were used for both fields and edges. This defaults to false.
+	WithDropColumn = schema.WithDropColumn
+	// WithDropIndex sets the drop index option to the migration.
+	// If this option is enabled, ent migration will drop old indexes
+	// that were defined in the schema. This defaults to false.
+	// Note that unique constraints are defined using `UNIQUE INDEX`,
+	// and therefore, it's recommended to enable this option to get more
+	// flexibility in the schema changes.
+	WithDropIndex = schema.WithDropIndex
+	// WithForeignKeys enables creating foreign-key in schema DDL. This defaults to true.
+	WithForeignKeys = schema.WithForeignKeys
+)
+
+// Schema is the API for creating, migrating and dropping a schema.
+type Schema struct {
+	drv dialect.Driver
+}
+
+// NewSchema creates a new schema client.
+func NewSchema(drv dialect.Driver) *Schema { return &Schema{drv: drv} }
+
+// Create creates all schema resources.
+func (s *Schema) Create(ctx context.Context, opts ...schema.MigrateOption) error {
+	return Create(ctx, s, Tables, opts...)
+}
+
+// Create creates all table resources using the given schema driver.
+func Create(ctx context.Context, s *Schema, tables []*schema.Table, opts ...schema.MigrateOption) error {
+	migrate, err := schema.NewMigrate(s.drv, opts...)
+	if err != nil {
+		return fmt.Errorf("ent/migrate: %w", err)
+	}
+	return migrate.Create(ctx, tables...)
+}
+
+// WriteTo writes the schema changes to w instead of running them against the database.
+//
+//	if err := client.Schema.WriteTo(context.Background(), os.Stdout); err != nil {
+//		log.Fatal(err)
+//	}
+func (s *Schema) WriteTo(ctx context.Context, w io.Writer, opts ...schema.MigrateOption) error {
+	return Create(ctx, &Schema{drv: &schema.WriteDriver{Writer: w, Driver: s.drv}}, Tables, opts...)
+}

examples/traversal/ent/migrate/schema.go

@@ -0,0 +1,162 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package migrate
+
+import (
+	"entgo.io/ent/dialect/sql/schema"
+	"entgo.io/ent/schema/field"
+)
+
+var (
+	// GroupsColumns holds the columns for the "groups" table.
+	GroupsColumns = []*schema.Column{
+		{Name: "id", Type: field.TypeInt, Increment: true},
+		{Name: "name", Type: field.TypeString},
+		{Name: "group_admin", Type: field.TypeInt, Nullable: true},
+	}
+	// GroupsTable holds the schema information for the "groups" table.
+	GroupsTable = &schema.Table{
+		Name:       "groups",
+		Columns:    GroupsColumns,
+		PrimaryKey: []*schema.Column{GroupsColumns[0]},
+		ForeignKeys: []*schema.ForeignKey{
+			{
+				Symbol:     "groups_users_admin",
+				Columns:    []*schema.Column{GroupsColumns[2]},
+				RefColumns: []*schema.Column{UsersColumns[0]},
+				OnDelete:   schema.SetNull,
+			},
+		},
+	}
+	// PetsColumns holds the columns for the "pets" table.
+	PetsColumns = []*schema.Column{
+		{Name: "id", Type: field.TypeInt, Increment: true},
+		{Name: "name", Type: field.TypeString},
+		{Name: "user_pets", Type: field.TypeInt, Nullable: true},
+	}
+	// PetsTable holds the schema information for the "pets" table.
+	PetsTable = &schema.Table{
+		Name:       "pets",
+		Columns:    PetsColumns,
+		PrimaryKey: []*schema.Column{PetsColumns[0]},
+		ForeignKeys: []*schema.ForeignKey{
+			{
+				Symbol:     "pets_users_pets",
+				Columns:    []*schema.Column{PetsColumns[2]},
+				RefColumns: []*schema.Column{UsersColumns[0]},
+				OnDelete:   schema.SetNull,
+			},
+		},
+	}
+	// UsersColumns holds the columns for the "users" table.
+	UsersColumns = []*schema.Column{
+		{Name: "id", Type: field.TypeInt, Increment: true},
+		{Name: "age", Type: field.TypeInt},
+		{Name: "name", Type: field.TypeString},
+	}
+	// UsersTable holds the schema information for the "users" table.
+	UsersTable = &schema.Table{
+		Name:       "users",
+		Columns:    UsersColumns,
+		PrimaryKey: []*schema.Column{UsersColumns[0]},
+	}
+	// GroupUsersColumns holds the columns for the "group_users" table.
+	GroupUsersColumns = []*schema.Column{
+		{Name: "group_id", Type: field.TypeInt},
+		{Name: "user_id", Type: field.TypeInt},
+	}
+	// GroupUsersTable holds the schema information for the "group_users" table.
+	GroupUsersTable = &schema.Table{
+		Name:       "group_users",
+		Columns:    GroupUsersColumns,
+		PrimaryKey: []*schema.Column{GroupUsersColumns[0], GroupUsersColumns[1]},
+		ForeignKeys: []*schema.ForeignKey{
+			{
+				Symbol:     "group_users_group_id",
+				Columns:    []*schema.Column{GroupUsersColumns[0]},
+				RefColumns: []*schema.Column{GroupsColumns[0]},
+				OnDelete:   schema.Cascade,
+			},
+			{
+				Symbol:     "group_users_user_id",
+				Columns:    []*schema.Column{GroupUsersColumns[1]},
+				RefColumns: []*schema.Column{UsersColumns[0]},
+				OnDelete:   schema.Cascade,
+			},
+		},
+	}
+	// PetFriendsColumns holds the columns for the "pet_friends" table.
+	PetFriendsColumns = []*schema.Column{
+		{Name: "pet_id", Type: field.TypeInt},
+		{Name: "friend_id", Type: field.TypeInt},
+	}
+	// PetFriendsTable holds the schema information for the "pet_friends" table.
+	PetFriendsTable = &schema.Table{
+		Name:       "pet_friends",
+		Columns:    PetFriendsColumns,
+		PrimaryKey: []*schema.Column{PetFriendsColumns[0], PetFriendsColumns[1]},
+		ForeignKeys: []*schema.ForeignKey{
+			{
+				Symbol:     "pet_friends_pet_id",
+				Columns:    []*schema.Column{PetFriendsColumns[0]},
+				RefColumns: []*schema.Column{PetsColumns[0]},
+				OnDelete:   schema.Cascade,
+			},
+			{
+				Symbol:     "pet_friends_friend_id",
+				Columns:    []*schema.Column{PetFriendsColumns[1]},
+				RefColumns: []*schema.Column{PetsColumns[0]},
+				OnDelete:   schema.Cascade,
+			},
+		},
+	}
+	// UserFriendsColumns holds the columns for the "user_friends" table.
+	UserFriendsColumns = []*schema.Column{
+		{Name: "user_id", Type: field.TypeInt},
+		{Name: "friend_id", Type: field.TypeInt},
+	}
+	// UserFriendsTable holds the schema information for the "user_friends" table.
+	UserFriendsTable = &schema.Table{
+		Name:       "user_friends",
+		Columns:    UserFriendsColumns,
+		PrimaryKey: []*schema.Column{UserFriendsColumns[0], UserFriendsColumns[1]},
+		ForeignKeys: []*schema.ForeignKey{
+			{
+				Symbol:     "user_friends_user_id",
+				Columns:    []*schema.Column{UserFriendsColumns[0]},
+				RefColumns: []*schema.Column{UsersColumns[0]},
+				OnDelete:   schema.Cascade,
+			},
+			{
+				Symbol:     "user_friends_friend_id",
+				Columns:    []*schema.Column{UserFriendsColumns[1]},
+				RefColumns: []*schema.Column{UsersColumns[0]},
+				OnDelete:   schema.Cascade,
+			},
+		},
+	}
+	// Tables holds all the tables in the schema.
+	Tables = []*schema.Table{
+		GroupsTable,
+		PetsTable,
+		UsersTable,
+		GroupUsersTable,
+		PetFriendsTable,
+		UserFriendsTable,
+	}
+)
+
+func init() {
+	GroupsTable.ForeignKeys[0].RefTable = UsersTable
+	PetsTable.ForeignKeys[0].RefTable = UsersTable
+	GroupUsersTable.ForeignKeys[0].RefTable = GroupsTable
+	GroupUsersTable.ForeignKeys[1].RefTable = UsersTable
+	PetFriendsTable.ForeignKeys[0].RefTable = PetsTable
+	PetFriendsTable.ForeignKeys[1].RefTable = PetsTable
+	UserFriendsTable.ForeignKeys[0].RefTable = UsersTable
+	UserFriendsTable.ForeignKeys[1].RefTable = UsersTable
+}

examples/traversal/ent/mutation.go

@@ -0,0 +1,451 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"sync"
+
+	"entgo.io/ent"
+	"entgo.io/ent/examples/traversal/ent/group"
+	"entgo.io/ent/examples/traversal/ent/pet"
+	"entgo.io/ent/examples/traversal/ent/user"
+)
+
+const (
+	// Operation types.
+	OpCreate    = ent.OpCreate
+	OpDelete    = ent.OpDelete
+	OpDeleteOne = ent.OpDeleteOne
+	OpUpdate    = ent.OpUpdate
+	OpUpdateOne = ent.OpUpdateOne
+
+	// Node types.
+	TypeGroup = "Group"
+	TypePet   = "Pet"
+	TypeUser  = "User"
+)
+
+// GroupMutation represents an operation that mutates the Group nodes in the graph.
+type GroupMutation struct {
+	group.Mutation
+	config
+	id       *int
+	done     bool
+	oldValue func(context.Context) (*Group, error)
+}
+
+var _ ent.Mutation = (*GroupMutation)(nil)
+
+// groupOption allows management of the mutation configuration using functional options.
+type groupOption func(*GroupMutation)
+
+// newGroupMutation creates new mutation for the Group entity.
+func newGroupMutation(c config, op Op, opts ...groupOption) *GroupMutation {
+	m := &GroupMutation{
+		Mutation: *group.NewMutation(op),
+		config:   c,
+	}
+	for _, opt := range opts {
+		opt(m)
+	}
+	return m
+}
+
+// ID returns the ID value in the mutation. Note that the ID is only available
+// if it was provided to the builder or after it was returned from the database.
+func (m *GroupMutation) ID() (id int, exists bool) {
+	if m.id == nil {
+		return
+	}
+	return *m.id, true
+}
+
+// withGroupID sets the ID field of the mutation.
+func withGroupID(id int) groupOption {
+	return func(m *GroupMutation) {
+		var (
+			err   error
+			once  sync.Once
+			value *Group
+		)
+		m.oldValue = func(ctx context.Context) (*Group, error) {
+			once.Do(func() {
+				if m.done {
+					err = errors.New("querying old values post mutation is not allowed")
+				} else {
+					value, err = m.Client().Group.Get(ctx, id)
+				}
+			})
+			return value, err
+		}
+		m.id = &id
+	}
+}
+
+// withGroup sets the old Group of the mutation.
+func withGroup(node *Group) groupOption {
+	return func(m *GroupMutation) {
+		m.oldValue = func(context.Context) (*Group, error) {
+			return node, nil
+		}
+		m.id = &node.ID
+	}
+}
+
+// Client returns a new `ent.Client` from the mutation. If the mutation was
+// executed in a transaction (ent.Tx), a transactional client is returned.
+func (m GroupMutation) Client() *Client {
+	client := &Client{config: m.config}
+	client.init()
+	return client
+}
+
+// Tx returns an `ent.Tx` for mutations that were executed in transactions;
+// it returns an error otherwise.
+func (m GroupMutation) Tx() (*Tx, error) {
+	if _, ok := m.driver.(*txDriver); !ok {
+		return nil, errors.New("ent: mutation is not running in a transaction")
+	}
+	tx := &Tx{config: m.config}
+	tx.init()
+	return tx, nil
+}
+
+// IDs queries the database and returns the entity ids that match the mutation's predicate.
+// That means, if the mutation is applied within a transaction with an isolation level such
+// as sql.LevelSerializable, the returned ids match the ids of the rows that will be updated
+// or updated by the mutation.
+func (m *GroupMutation) IDs(ctx context.Context) ([]int, error) {
+	switch {
+	case m.Op().Is(OpUpdateOne | OpDeleteOne):
+		id, exists := m.ID()
+		if exists {
+			return []int{id}, nil
+		}
+		fallthrough
+	case m.Op().Is(OpUpdate | OpDelete):
+		return m.Client().Group.Query().Where(m.Predicates()...).IDs(ctx)
+	default:
+		return nil, fmt.Errorf("IDs is not allowed on %s operations", m.Op())
+	}
+}
+
+// OldName returns the old "name" field's value of the Group entity.
+// If the Group object wasn't provided to the builder, the object is fetched from the database.
+// An error is returned if the mutation operation is not UpdateOne, or the database query fails.
+func (m *GroupMutation) OldName(ctx context.Context) (v string, err error) {
+	if !m.Op().Is(OpUpdateOne) {
+		return v, errors.New("OldName is only allowed on UpdateOne operations")
+	}
+	if _, exists := m.ID(); !exists || m.oldValue == nil {
+		return v, errors.New("OldName requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldName: %w", err)
+	}
+	return oldValue.Name, nil
+}
+
+// OldField returns the old value of the field from the database. An error is
+// returned if the mutation operation is not UpdateOne, or the query to the
+// database failed.
+func (m *GroupMutation) OldField(ctx context.Context, name string) (ent.Value, error) {
+	switch name {
+	case group.FieldName:
+		return m.OldName(ctx)
+	}
+	return nil, fmt.Errorf("unknown Group field %s", name)
+}
+
+// PetMutation represents an operation that mutates the Pet nodes in the graph.
+type PetMutation struct {
+	pet.Mutation
+	config
+	id       *int
+	done     bool
+	oldValue func(context.Context) (*Pet, error)
+}
+
+var _ ent.Mutation = (*PetMutation)(nil)
+
+// petOption allows management of the mutation configuration using functional options.
+type petOption func(*PetMutation)
+
+// newPetMutation creates new mutation for the Pet entity.
+func newPetMutation(c config, op Op, opts ...petOption) *PetMutation {
+	m := &PetMutation{
+		Mutation: *pet.NewMutation(op),
+		config:   c,
+	}
+	for _, opt := range opts {
+		opt(m)
+	}
+	return m
+}
+
+// ID returns the ID value in the mutation. Note that the ID is only available
+// if it was provided to the builder or after it was returned from the database.
+func (m *PetMutation) ID() (id int, exists bool) {
+	if m.id == nil {
+		return
+	}
+	return *m.id, true
+}
+
+// withPetID sets the ID field of the mutation.
+func withPetID(id int) petOption {
+	return func(m *PetMutation) {
+		var (
+			err   error
+			once  sync.Once
+			value *Pet
+		)
+		m.oldValue = func(ctx context.Context) (*Pet, error) {
+			once.Do(func() {
+				if m.done {
+					err = errors.New("querying old values post mutation is not allowed")
+				} else {
+					value, err = m.Client().Pet.Get(ctx, id)
+				}
+			})
+			return value, err
+		}
+		m.id = &id
+	}
+}
+
+// withPet sets the old Pet of the mutation.
+func withPet(node *Pet) petOption {
+	return func(m *PetMutation) {
+		m.oldValue = func(context.Context) (*Pet, error) {
+			return node, nil
+		}
+		m.id = &node.ID
+	}
+}
+
+// Client returns a new `ent.Client` from the mutation. If the mutation was
+// executed in a transaction (ent.Tx), a transactional client is returned.
+func (m PetMutation) Client() *Client {
+	client := &Client{config: m.config}
+	client.init()
+	return client
+}
+
+// Tx returns an `ent.Tx` for mutations that were executed in transactions;
+// it returns an error otherwise.
+func (m PetMutation) Tx() (*Tx, error) {
+	if _, ok := m.driver.(*txDriver); !ok {
+		return nil, errors.New("ent: mutation is not running in a transaction")
+	}
+	tx := &Tx{config: m.config}
+	tx.init()
+	return tx, nil
+}
+
+// IDs queries the database and returns the entity ids that match the mutation's predicate.
+// That means, if the mutation is applied within a transaction with an isolation level such
+// as sql.LevelSerializable, the returned ids match the ids of the rows that will be updated
+// or updated by the mutation.
+func (m *PetMutation) IDs(ctx context.Context) ([]int, error) {
+	switch {
+	case m.Op().Is(OpUpdateOne | OpDeleteOne):
+		id, exists := m.ID()
+		if exists {
+			return []int{id}, nil
+		}
+		fallthrough
+	case m.Op().Is(OpUpdate | OpDelete):
+		return m.Client().Pet.Query().Where(m.Predicates()...).IDs(ctx)
+	default:
+		return nil, fmt.Errorf("IDs is not allowed on %s operations", m.Op())
+	}
+}
+
+// OldName returns the old "name" field's value of the Pet entity.
+// If the Pet object wasn't provided to the builder, the object is fetched from the database.
+// An error is returned if the mutation operation is not UpdateOne, or the database query fails.
+func (m *PetMutation) OldName(ctx context.Context) (v string, err error) {
+	if !m.Op().Is(OpUpdateOne) {
+		return v, errors.New("OldName is only allowed on UpdateOne operations")
+	}
+	if _, exists := m.ID(); !exists || m.oldValue == nil {
+		return v, errors.New("OldName requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldName: %w", err)
+	}
+	return oldValue.Name, nil
+}
+
+// OldField returns the old value of the field from the database. An error is
+// returned if the mutation operation is not UpdateOne, or the query to the
+// database failed.
+func (m *PetMutation) OldField(ctx context.Context, name string) (ent.Value, error) {
+	switch name {
+	case pet.FieldName:
+		return m.OldName(ctx)
+	}
+	return nil, fmt.Errorf("unknown Pet field %s", name)
+}
+
+// UserMutation represents an operation that mutates the User nodes in the graph.
+type UserMutation struct {
+	user.Mutation
+	config
+	id       *int
+	done     bool
+	oldValue func(context.Context) (*User, error)
+}
+
+var _ ent.Mutation = (*UserMutation)(nil)
+
+// userOption allows management of the mutation configuration using functional options.
+type userOption func(*UserMutation)
+
+// newUserMutation creates new mutation for the User entity.
+func newUserMutation(c config, op Op, opts ...userOption) *UserMutation {
+	m := &UserMutation{
+		Mutation: *user.NewMutation(op),
+		config:   c,
+	}
+	for _, opt := range opts {
+		opt(m)
+	}
+	return m
+}
+
+// ID returns the ID value in the mutation. Note that the ID is only available
+// if it was provided to the builder or after it was returned from the database.
+func (m *UserMutation) ID() (id int, exists bool) {
+	if m.id == nil {
+		return
+	}
+	return *m.id, true
+}
+
+// withUserID sets the ID field of the mutation.
+func withUserID(id int) userOption {
+	return func(m *UserMutation) {
+		var (
+			err   error
+			once  sync.Once
+			value *User
+		)
+		m.oldValue = func(ctx context.Context) (*User, error) {
+			once.Do(func() {
+				if m.done {
+					err = errors.New("querying old values post mutation is not allowed")
+				} else {
+					value, err = m.Client().User.Get(ctx, id)
+				}
+			})
+			return value, err
+		}
+		m.id = &id
+	}
+}
+
+// withUser sets the old User of the mutation.
+func withUser(node *User) userOption {
+	return func(m *UserMutation) {
+		m.oldValue = func(context.Context) (*User, error) {
+			return node, nil
+		}
+		m.id = &node.ID
+	}
+}
+
+// Client returns a new `ent.Client` from the mutation. If the mutation was
+// executed in a transaction (ent.Tx), a transactional client is returned.
+func (m UserMutation) Client() *Client {
+	client := &Client{config: m.config}
+	client.init()
+	return client
+}
+
+// Tx returns an `ent.Tx` for mutations that were executed in transactions;
+// it returns an error otherwise.
+func (m UserMutation) Tx() (*Tx, error) {
+	if _, ok := m.driver.(*txDriver); !ok {
+		return nil, errors.New("ent: mutation is not running in a transaction")
+	}
+	tx := &Tx{config: m.config}
+	tx.init()
+	return tx, nil
+}
+
+// IDs queries the database and returns the entity ids that match the mutation's predicate.
+// That means, if the mutation is applied within a transaction with an isolation level such
+// as sql.LevelSerializable, the returned ids match the ids of the rows that will be updated
+// or updated by the mutation.
+func (m *UserMutation) IDs(ctx context.Context) ([]int, error) {
+	switch {
+	case m.Op().Is(OpUpdateOne | OpDeleteOne):
+		id, exists := m.ID()
+		if exists {
+			return []int{id}, nil
+		}
+		fallthrough
+	case m.Op().Is(OpUpdate | OpDelete):
+		return m.Client().User.Query().Where(m.Predicates()...).IDs(ctx)
+	default:
+		return nil, fmt.Errorf("IDs is not allowed on %s operations", m.Op())
+	}
+}
+
+// OldAge returns the old "age" field's value of the User entity.
+// If the User object wasn't provided to the builder, the object is fetched from the database.
+// An error is returned if the mutation operation is not UpdateOne, or the database query fails.
+func (m *UserMutation) OldAge(ctx context.Context) (v int, err error) {
+	if !m.Op().Is(OpUpdateOne) {
+		return v, errors.New("OldAge is only allowed on UpdateOne operations")
+	}
+	if _, exists := m.ID(); !exists || m.oldValue == nil {
+		return v, errors.New("OldAge requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldAge: %w", err)
+	}
+	return oldValue.Age, nil
+}
+
+// OldName returns the old "name" field's value of the User entity.
+// If the User object wasn't provided to the builder, the object is fetched from the database.
+// An error is returned if the mutation operation is not UpdateOne, or the database query fails.
+func (m *UserMutation) OldName(ctx context.Context) (v string, err error) {
+	if !m.Op().Is(OpUpdateOne) {
+		return v, errors.New("OldName is only allowed on UpdateOne operations")
+	}
+	if _, exists := m.ID(); !exists || m.oldValue == nil {
+		return v, errors.New("OldName requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldName: %w", err)
+	}
+	return oldValue.Name, nil
+}
+
+// OldField returns the old value of the field from the database. An error is
+// returned if the mutation operation is not UpdateOne, or the query to the
+// database failed.
+func (m *UserMutation) OldField(ctx context.Context, name string) (ent.Value, error) {
+	switch name {
+	case user.FieldAge:
+		return m.OldAge(ctx)
+	case user.FieldName:
+		return m.OldName(ctx)
+	}
+	return nil, fmt.Errorf("unknown User field %s", name)
+}

examples/traversal/ent/pet.go

@@ -0,0 +1,162 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"fmt"
+	"strings"
+
+	"entgo.io/ent"
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/examples/traversal/ent/pet"
+	"entgo.io/ent/examples/traversal/ent/user"
+)
+
+// Pet is the model entity for the Pet schema.
+type Pet struct {
+	config `json:"-"`
+	// ID of the ent.
+	ID int `json:"id,omitempty"`
+	// Name holds the value of the "name" field.
+	Name string `json:"name,omitempty"`
+	// Edges holds the relations/edges for other nodes in the graph.
+	// The values are being populated by the PetQuery when eager-loading is set.
+	Edges        PetEdges `json:"edges"`
+	user_pets    *int
+	selectValues sql.SelectValues
+}
+
+// PetEdges holds the relations/edges for other nodes in the graph.
+type PetEdges struct {
+	// Friends holds the value of the friends edge.
+	Friends []*Pet `json:"friends,omitempty"`
+	// Owner holds the value of the owner edge.
+	Owner *User `json:"owner,omitempty"`
+	// loadedTypes holds the information for reporting if a
+	// type was loaded (or requested) in eager-loading or not.
+	loadedTypes [2]bool
+}
+
+// FriendsOrErr returns the Friends value or an error if the edge
+// was not loaded in eager-loading.
+func (e PetEdges) FriendsOrErr() ([]*Pet, error) {
+	if e.loadedTypes[0] {
+		return e.Friends, nil
+	}
+	return nil, &NotLoadedError{edge: "friends"}
+}
+
+// OwnerOrErr returns the Owner value or an error if the edge
+// was not loaded in eager-loading, or loaded but was not found.
+func (e PetEdges) OwnerOrErr() (*User, error) {
+	if e.Owner != nil {
+		return e.Owner, nil
+	} else if e.loadedTypes[1] {
+		return nil, &NotFoundError{label: user.Label}
+	}
+	return nil, &NotLoadedError{edge: "owner"}
+}
+
+// scanValues returns the types for scanning values from sql.Rows.
+func (*Pet) scanValues(columns []string) ([]any, error) {
+	values := make([]any, len(columns))
+	for i := range columns {
+		switch columns[i] {
+		case pet.FieldID:
+			values[i] = new(sql.NullInt64)
+		case pet.FieldName:
+			values[i] = new(sql.NullString)
+		case pet.ForeignKeys[0]: // user_pets
+			values[i] = new(sql.NullInt64)
+		default:
+			values[i] = new(sql.UnknownType)
+		}
+	}
+	return values, nil
+}
+
+// assignValues assigns the values that were returned from sql.Rows (after scanning)
+// to the Pet fields.
+func (_m *Pet) assignValues(columns []string, values []any) error {
+	if m, n := len(values), len(columns); m < n {
+		return fmt.Errorf("mismatch number of scan values: %d != %d", m, n)
+	}
+	for i := range columns {
+		switch columns[i] {
+		case pet.FieldID:
+			value, ok := values[i].(*sql.NullInt64)
+			if !ok {
+				return fmt.Errorf("unexpected type %T for field id", value)
+			}
+			_m.ID = int(value.Int64)
+		case pet.FieldName:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field name", values[i])
+			} else if value.Valid {
+				_m.Name = value.String
+			}
+		case pet.ForeignKeys[0]:
+			if value, ok := values[i].(*sql.NullInt64); !ok {
+				return fmt.Errorf("unexpected type %T for edge-field user_pets", value)
+			} else if value.Valid {
+				_m.user_pets = new(int)
+				*_m.user_pets = int(value.Int64)
+			}
+		default:
+			_m.selectValues.Set(columns[i], values[i])
+		}
+	}
+	return nil
+}
+
+// Value returns the ent.Value that was dynamically selected and assigned to the Pet.
+// This includes values selected through modifiers, order, etc.
+func (_m *Pet) Value(name string) (ent.Value, error) {
+	return _m.selectValues.Get(name)
+}
+
+// QueryFriends queries the "friends" edge of the Pet entity.
+func (_m *Pet) QueryFriends() *PetQuery {
+	return NewPetClient(_m.config).QueryFriends(_m)
+}
+
+// QueryOwner queries the "owner" edge of the Pet entity.
+func (_m *Pet) QueryOwner() *UserQuery {
+	return NewPetClient(_m.config).QueryOwner(_m)
+}
+
+// Update returns a builder for updating this Pet.
+// Note that you need to call Pet.Unwrap() before calling this method if this Pet
+// was returned from a transaction, and the transaction was committed or rolled back.
+func (_m *Pet) Update() *PetUpdateOne {
+	return NewPetClient(_m.config).UpdateOne(_m)
+}
+
+// Unwrap unwraps the Pet entity that was returned from a transaction after it was closed,
+// so that all future queries will be executed through the driver which created the transaction.
+func (_m *Pet) Unwrap() *Pet {
+	_tx, ok := _m.config.driver.(*txDriver)
+	if !ok {
+		panic("ent: Pet is not a transactional entity")
+	}
+	_m.config.driver = _tx.drv
+	return _m
+}
+
+// String implements the fmt.Stringer.
+func (_m *Pet) String() string {
+	var builder strings.Builder
+	builder.WriteString("Pet(")
+	builder.WriteString(fmt.Sprintf("id=%v, ", _m.ID))
+	builder.WriteString("name=")
+	builder.WriteString(_m.Name)
+	builder.WriteByte(')')
+	return builder.String()
+}
+
+// Pets is a parsable slice of Pet.
+type Pets []*Pet

examples/traversal/ent/pet/mutation.go

@@ -0,0 +1,385 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package pet
+
+import (
+	"context"
+	"fmt"
+
+	"entgo.io/ent"
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+)
+
+// Mutation represents an operation that mutates the Pet nodes in the graph.
+type Mutation struct {
+	op             ent.Op
+	typ            string
+	name           *string
+	clearedFields  map[string]struct{}
+	friends        map[int]struct{}
+	removedfriends map[int]struct{}
+	clearedfriends bool
+	owner          *int
+	clearedowner   bool
+	predicates     []predicate.Pet
+}
+
+// NewMutation creates a new Mutation for the Pet entity.
+func NewMutation(op ent.Op) *Mutation {
+	return &Mutation{
+		op:            op,
+		typ:           "Pet",
+		clearedFields: make(map[string]struct{}),
+	}
+}
+
+// Predicates returns the list of predicates set on the mutation.
+func (m *Mutation) Predicates() []predicate.Pet {
+	return m.predicates
+}
+
+// SetName sets the "name" field.
+func (m *Mutation) SetName(s string) {
+	m.name = &s
+}
+
+// Name returns the value of the "name" field in the mutation.
+func (m *Mutation) Name() (r string, exists bool) {
+	v := m.name
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// ResetName resets all changes to the "name" field.
+func (m *Mutation) ResetName() {
+	m.name = nil
+}
+
+// AddFriendIDs adds the "friends" edge to the Pet entity by ids.
+func (m *Mutation) AddFriendIDs(ids ...int) {
+	if m.friends == nil {
+		m.friends = make(map[int]struct{})
+	}
+	for i := range ids {
+		m.friends[ids[i]] = struct{}{}
+	}
+}
+
+// ClearFriends clears the "friends" edge to the Pet entity.
+func (m *Mutation) ClearFriends() {
+	m.clearedfriends = true
+}
+
+// FriendsCleared reports if the "friends" edge to the Pet entity was cleared.
+func (m *Mutation) FriendsCleared() bool {
+	return m.clearedfriends
+}
+
+// RemoveFriendIDs removes the "friends" edge to the Pet entity by IDs.
+func (m *Mutation) RemoveFriendIDs(ids ...int) {
+	if m.removedfriends == nil {
+		m.removedfriends = make(map[int]struct{})
+	}
+	for i := range ids {
+		delete(m.friends, ids[i])
+		m.removedfriends[ids[i]] = struct{}{}
+	}
+}
+
+// RemovedFriends returns the removed IDs of the "friends" edge to the Pet entity.
+func (m *Mutation) RemovedFriendsIDs() (ids []int) {
+	for id := range m.removedfriends {
+		ids = append(ids, id)
+	}
+	return
+}
+
+// FriendsIDs returns the "friends" edge IDs in the mutation.
+func (m *Mutation) FriendsIDs() (ids []int) {
+	for id := range m.friends {
+		ids = append(ids, id)
+	}
+	return
+}
+
+// ResetFriends resets all changes to the "friends" edge.
+func (m *Mutation) ResetFriends() {
+	m.friends = nil
+	m.clearedfriends = false
+	m.removedfriends = nil
+}
+
+// SetOwnerID sets the "owner" edge to the User entity by id.
+func (m *Mutation) SetOwnerID(id int) {
+	m.owner = &id
+}
+
+// ClearOwner clears the "owner" edge to the User entity.
+func (m *Mutation) ClearOwner() {
+	m.clearedowner = true
+}
+
+// OwnerCleared reports if the "owner" edge to the User entity was cleared.
+func (m *Mutation) OwnerCleared() bool {
+	return m.clearedowner
+}
+
+// OwnerID returns the "owner" edge ID in the mutation.
+func (m *Mutation) OwnerID() (id int, exists bool) {
+	if m.owner != nil {
+		return *m.owner, true
+	}
+	return
+}
+
+// OwnerIDs returns the "owner" edge IDs in the mutation.
+// Note that IDs always returns len(IDs) <= 1 for unique edges, and you should use
+// OwnerID instead. It exists only for internal usage by the builders.
+func (m *Mutation) OwnerIDs() (ids []int) {
+	if id := m.owner; id != nil {
+		ids = append(ids, *id)
+	}
+	return
+}
+
+// ResetOwner resets all changes to the "owner" edge.
+func (m *Mutation) ResetOwner() {
+	m.owner = nil
+	m.clearedowner = false
+}
+
+// Where appends a list predicates to the Mutation builder.
+func (m *Mutation) Where(ps ...predicate.Pet) {
+	m.predicates = append(m.predicates, ps...)
+}
+
+// WhereP appends storage-level predicates to the Mutation builder. Using this method,
+// users can use type-assertion to append predicates that do not depend on any generated package.
+func (m *Mutation) WhereP(ps ...func(*sql.Selector)) {
+	p := make([]predicate.Pet, len(ps))
+	for i := range ps {
+		p[i] = ps[i]
+	}
+	m.Where(p...)
+}
+
+// Op returns the operation name.
+func (m *Mutation) Op() ent.Op {
+	return m.op
+}
+
+// SetOp allows setting the mutation operation.
+func (m *Mutation) SetOp(op ent.Op) {
+	m.op = op
+}
+
+// Type returns the node type of this mutation (Pet).
+func (m *Mutation) Type() string {
+	return m.typ
+}
+
+// Fields returns all fields that were changed during this mutation. Note that in
+// order to get all numeric fields that were incremented/decremented, call
+// AddedFields().
+func (m *Mutation) Fields() []string {
+	fields := make([]string, 0, 1)
+	if m.name != nil {
+		fields = append(fields, FieldName)
+	}
+	return fields
+}
+
+// Field returns the value of a field with the given name. The second boolean
+// return value indicates that this field was not set, or was not defined in the
+// schema.
+func (m *Mutation) Field(name string) (ent.Value, bool) {
+	switch name {
+	case FieldName:
+		return m.Name()
+	}
+	return nil, false
+}
+
+// OldField returns the old value of the field from the database. An error is
+// returned if the mutation operation is not UpdateOne, or the query to the
+// database failed.
+func (m *Mutation) OldField(ctx context.Context, name string) (ent.Value, error) {
+	return nil, fmt.Errorf("unknown Pet field %s", name)
+}
+
+// SetField sets the value of a field with the given name. It returns an error if
+// the field is not defined in the schema, or if the type mismatched the field
+// type.
+func (m *Mutation) SetField(name string, value ent.Value) error {
+	switch name {
+	case FieldName:
+		v, ok := value.(string)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.SetName(v)
+		return nil
+	}
+	return fmt.Errorf("unknown Pet field %s", name)
+}
+
+// AddedFields returns all numeric fields that were incremented/decremented during
+// this mutation.
+func (m *Mutation) AddedFields() []string {
+	return nil
+}
+
+// AddedField returns the numeric value that was incremented/decremented on a field
+// with the given name. The second boolean return value indicates that this field
+// was not set, or was not defined in the schema.
+func (m *Mutation) AddedField(name string) (ent.Value, bool) {
+	return nil, false
+}
+
+// AddField adds the value to the field with the given name. It returns an error if
+// the field is not defined in the schema, or if the type mismatched the field
+// type.
+func (m *Mutation) AddField(name string, value ent.Value) error {
+	switch name {
+	}
+	return fmt.Errorf("unknown Pet numeric field %s", name)
+}
+
+// ClearedFields returns all nullable fields that were cleared during this
+// mutation.
+func (m *Mutation) ClearedFields() []string {
+	return nil
+}
+
+// FieldCleared returns a boolean indicating if a field with the given name was
+// cleared in this mutation.
+func (m *Mutation) FieldCleared(name string) bool {
+	_, ok := m.clearedFields[name]
+	return ok
+}
+
+// ClearField clears the value of the field with the given name. It returns an
+// error if the field is not defined in the schema.
+func (m *Mutation) ClearField(name string) error {
+	return fmt.Errorf("unknown Pet nullable field %s", name)
+}
+
+// ResetField resets all changes in the mutation for the field with the given name.
+// It returns an error if the field is not defined in the schema.
+func (m *Mutation) ResetField(name string) error {
+	switch name {
+	case FieldName:
+		m.ResetName()
+		return nil
+	}
+	return fmt.Errorf("unknown Pet field %s", name)
+}
+
+// AddedEdges returns all edge names that were set/added in this mutation.
+func (m *Mutation) AddedEdges() []string {
+	edges := make([]string, 0, 2)
+	if m.friends != nil {
+		edges = append(edges, EdgeFriends)
+	}
+	if m.owner != nil {
+		edges = append(edges, EdgeOwner)
+	}
+	return edges
+}
+
+// AddedIDs returns all IDs (to other nodes) that were added for the given edge
+// name in this mutation.
+func (m *Mutation) AddedIDs(name string) []ent.Value {
+	switch name {
+	case EdgeFriends:
+		ids := make([]ent.Value, 0, len(m.friends))
+		for id := range m.friends {
+			ids = append(ids, id)
+		}
+		return ids
+	case EdgeOwner:
+		if id := m.owner; id != nil {
+			return []ent.Value{*id}
+		}
+	}
+	return nil
+}
+
+// RemovedEdges returns all edge names that were removed in this mutation.
+func (m *Mutation) RemovedEdges() []string {
+	edges := make([]string, 0, 2)
+	if m.removedfriends != nil {
+		edges = append(edges, EdgeFriends)
+	}
+	return edges
+}
+
+// RemovedIDs returns all IDs (to other nodes) that were removed for the edge with
+// the given name in this mutation.
+func (m *Mutation) RemovedIDs(name string) []ent.Value {
+	switch name {
+	case EdgeFriends:
+		ids := make([]ent.Value, 0, len(m.removedfriends))
+		for id := range m.removedfriends {
+			ids = append(ids, id)
+		}
+		return ids
+	}
+	return nil
+}
+
+// ClearedEdges returns all edge names that were cleared in this mutation.
+func (m *Mutation) ClearedEdges() []string {
+	edges := make([]string, 0, 2)
+	if m.clearedfriends {
+		edges = append(edges, EdgeFriends)
+	}
+	if m.clearedowner {
+		edges = append(edges, EdgeOwner)
+	}
+	return edges
+}
+
+// EdgeCleared returns a boolean which indicates if the edge with the given name
+// was cleared in this mutation.
+func (m *Mutation) EdgeCleared(name string) bool {
+	switch name {
+	case EdgeFriends:
+		return m.clearedfriends
+	case EdgeOwner:
+		return m.clearedowner
+	}
+	return false
+}
+
+// ClearEdge clears the value of the edge with the given name. It returns an error
+// if that edge is not defined in the schema.
+func (m *Mutation) ClearEdge(name string) error {
+	switch name {
+	case EdgeOwner:
+		m.ClearOwner()
+		return nil
+	}
+	return fmt.Errorf("unknown Pet unique edge %s", name)
+}
+
+// ResetEdge resets all changes to the edge with the given name in this mutation.
+// It returns an error if the edge is not defined in the schema.
+func (m *Mutation) ResetEdge(name string) error {
+	switch name {
+	case EdgeFriends:
+		m.ResetFriends()
+		return nil
+	case EdgeOwner:
+		m.ResetOwner()
+		return nil
+	}
+	return fmt.Errorf("unknown Pet edge %s", name)
+}

examples/traversal/ent/pet/pet.go

@@ -0,0 +1,117 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package pet
+
+import (
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+)
+
+const (
+	// Label holds the string label denoting the pet type in the database.
+	Label = "pet"
+	// FieldID holds the string denoting the id field in the database.
+	FieldID = "id"
+	// FieldName holds the string denoting the name field in the database.
+	FieldName = "name"
+	// EdgeFriends holds the string denoting the friends edge name in mutations.
+	EdgeFriends = "friends"
+	// EdgeOwner holds the string denoting the owner edge name in mutations.
+	EdgeOwner = "owner"
+	// Table holds the table name of the pet in the database.
+	Table = "pets"
+	// FriendsTable is the table that holds the friends relation/edge. The primary key declared below.
+	FriendsTable = "pet_friends"
+	// OwnerTable is the table that holds the owner relation/edge.
+	OwnerTable = "pets"
+	// OwnerInverseTable is the table name for the User entity.
+	// It exists in this package in order to avoid circular dependency with the "user" package.
+	OwnerInverseTable = "users"
+	// OwnerColumn is the table column denoting the owner relation/edge.
+	OwnerColumn = "user_pets"
+)
+
+// Columns holds all SQL columns for pet fields.
+var Columns = []string{
+	FieldID,
+	FieldName,
+}
+
+// ForeignKeys holds the SQL foreign-keys that are owned by the "pets"
+// table and are not defined as standalone fields in the schema.
+var ForeignKeys = []string{
+	"user_pets",
+}
+
+var (
+	// FriendsPrimaryKey and FriendsColumn2 are the table columns denoting the
+	// primary key for the friends relation (M2M).
+	FriendsPrimaryKey = []string{"pet_id", "friend_id"}
+)
+
+// ValidColumn reports if the column name is valid (part of the table columns).
+func ValidColumn(column string) bool {
+	for i := range Columns {
+		if column == Columns[i] {
+			return true
+		}
+	}
+	for i := range ForeignKeys {
+		if column == ForeignKeys[i] {
+			return true
+		}
+	}
+	return false
+}
+
+// OrderOption defines the ordering options for the Pet queries.
+type OrderOption func(*sql.Selector)
+
+// ByID orders the results by the id field.
+func ByID(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldID, opts...).ToFunc()
+}
+
+// ByName orders the results by the name field.
+func ByName(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldName, opts...).ToFunc()
+}
+
+// ByFriendsCount orders the results by friends count.
+func ByFriendsCount(opts ...sql.OrderTermOption) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborsCount(s, newFriendsStep(), opts...)
+	}
+}
+
+// ByFriends orders the results by friends terms.
+func ByFriends(term sql.OrderTerm, terms ...sql.OrderTerm) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborTerms(s, newFriendsStep(), append([]sql.OrderTerm{term}, terms...)...)
+	}
+}
+
+// ByOwnerField orders the results by owner field.
+func ByOwnerField(field string, opts ...sql.OrderTermOption) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborTerms(s, newOwnerStep(), sql.OrderByField(field, opts...))
+	}
+}
+func newFriendsStep() *sqlgraph.Step {
+	return sqlgraph.NewStep(
+		sqlgraph.From(Table, FieldID),
+		sqlgraph.To(Table, FieldID),
+		sqlgraph.Edge(sqlgraph.M2M, false, FriendsTable, FriendsPrimaryKey...),
+	)
+}
+func newOwnerStep() *sqlgraph.Step {
+	return sqlgraph.NewStep(
+		sqlgraph.From(Table, FieldID),
+		sqlgraph.To(OwnerInverseTable, FieldID),
+		sqlgraph.Edge(sqlgraph.M2O, true, OwnerTable, OwnerColumn),
+	)
+}

examples/traversal/ent/pet/where.go

@@ -0,0 +1,189 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package pet
+
+import (
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+)
+
+// ID filters vertices based on their ID field.
+func ID(id int) predicate.Pet {
+	return predicate.Pet(sql.FieldEQ(FieldID, id))
+}
+
+// IDEQ applies the EQ predicate on the ID field.
+func IDEQ(id int) predicate.Pet {
+	return predicate.Pet(sql.FieldEQ(FieldID, id))
+}
+
+// IDNEQ applies the NEQ predicate on the ID field.
+func IDNEQ(id int) predicate.Pet {
+	return predicate.Pet(sql.FieldNEQ(FieldID, id))
+}
+
+// IDIn applies the In predicate on the ID field.
+func IDIn(ids ...int) predicate.Pet {
+	return predicate.Pet(sql.FieldIn(FieldID, ids...))
+}
+
+// IDNotIn applies the NotIn predicate on the ID field.
+func IDNotIn(ids ...int) predicate.Pet {
+	return predicate.Pet(sql.FieldNotIn(FieldID, ids...))
+}
+
+// IDGT applies the GT predicate on the ID field.
+func IDGT(id int) predicate.Pet {
+	return predicate.Pet(sql.FieldGT(FieldID, id))
+}
+
+// IDGTE applies the GTE predicate on the ID field.
+func IDGTE(id int) predicate.Pet {
+	return predicate.Pet(sql.FieldGTE(FieldID, id))
+}
+
+// IDLT applies the LT predicate on the ID field.
+func IDLT(id int) predicate.Pet {
+	return predicate.Pet(sql.FieldLT(FieldID, id))
+}
+
+// IDLTE applies the LTE predicate on the ID field.
+func IDLTE(id int) predicate.Pet {
+	return predicate.Pet(sql.FieldLTE(FieldID, id))
+}
+
+// Name applies equality check predicate on the "name" field. It's identical to NameEQ.
+func Name(v string) predicate.Pet {
+	return predicate.Pet(sql.FieldEQ(FieldName, v))
+}
+
+// NameEQ applies the EQ predicate on the "name" field.
+func NameEQ(v string) predicate.Pet {
+	return predicate.Pet(sql.FieldEQ(FieldName, v))
+}
+
+// NameNEQ applies the NEQ predicate on the "name" field.
+func NameNEQ(v string) predicate.Pet {
+	return predicate.Pet(sql.FieldNEQ(FieldName, v))
+}
+
+// NameIn applies the In predicate on the "name" field.
+func NameIn(vs ...string) predicate.Pet {
+	return predicate.Pet(sql.FieldIn(FieldName, vs...))
+}
+
+// NameNotIn applies the NotIn predicate on the "name" field.
+func NameNotIn(vs ...string) predicate.Pet {
+	return predicate.Pet(sql.FieldNotIn(FieldName, vs...))
+}
+
+// NameGT applies the GT predicate on the "name" field.
+func NameGT(v string) predicate.Pet {
+	return predicate.Pet(sql.FieldGT(FieldName, v))
+}
+
+// NameGTE applies the GTE predicate on the "name" field.
+func NameGTE(v string) predicate.Pet {
+	return predicate.Pet(sql.FieldGTE(FieldName, v))
+}
+
+// NameLT applies the LT predicate on the "name" field.
+func NameLT(v string) predicate.Pet {
+	return predicate.Pet(sql.FieldLT(FieldName, v))
+}
+
+// NameLTE applies the LTE predicate on the "name" field.
+func NameLTE(v string) predicate.Pet {
+	return predicate.Pet(sql.FieldLTE(FieldName, v))
+}
+
+// NameContains applies the Contains predicate on the "name" field.
+func NameContains(v string) predicate.Pet {
+	return predicate.Pet(sql.FieldContains(FieldName, v))
+}
+
+// NameHasPrefix applies the HasPrefix predicate on the "name" field.
+func NameHasPrefix(v string) predicate.Pet {
+	return predicate.Pet(sql.FieldHasPrefix(FieldName, v))
+}
+
+// NameHasSuffix applies the HasSuffix predicate on the "name" field.
+func NameHasSuffix(v string) predicate.Pet {
+	return predicate.Pet(sql.FieldHasSuffix(FieldName, v))
+}
+
+// NameEqualFold applies the EqualFold predicate on the "name" field.
+func NameEqualFold(v string) predicate.Pet {
+	return predicate.Pet(sql.FieldEqualFold(FieldName, v))
+}
+
+// NameContainsFold applies the ContainsFold predicate on the "name" field.
+func NameContainsFold(v string) predicate.Pet {
+	return predicate.Pet(sql.FieldContainsFold(FieldName, v))
+}
+
+// HasFriends applies the HasEdge predicate on the "friends" edge.
+func HasFriends() predicate.Pet {
+	return predicate.Pet(func(s *sql.Selector) {
+		step := sqlgraph.NewStep(
+			sqlgraph.From(Table, FieldID),
+			sqlgraph.Edge(sqlgraph.M2M, false, FriendsTable, FriendsPrimaryKey...),
+		)
+		sqlgraph.HasNeighbors(s, step)
+	})
+}
+
+// HasFriendsWith applies the HasEdge predicate on the "friends" edge with a given conditions (other predicates).
+func HasFriendsWith(preds ...predicate.Pet) predicate.Pet {
+	return predicate.Pet(func(s *sql.Selector) {
+		step := newFriendsStep()
+		sqlgraph.HasNeighborsWith(s, step, func(s *sql.Selector) {
+			for _, p := range preds {
+				p(s)
+			}
+		})
+	})
+}
+
+// HasOwner applies the HasEdge predicate on the "owner" edge.
+func HasOwner() predicate.Pet {
+	return predicate.Pet(func(s *sql.Selector) {
+		step := sqlgraph.NewStep(
+			sqlgraph.From(Table, FieldID),
+			sqlgraph.Edge(sqlgraph.M2O, true, OwnerTable, OwnerColumn),
+		)
+		sqlgraph.HasNeighbors(s, step)
+	})
+}
+
+// HasOwnerWith applies the HasEdge predicate on the "owner" edge with a given conditions (other predicates).
+func HasOwnerWith(preds ...predicate.User) predicate.Pet {
+	return predicate.Pet(func(s *sql.Selector) {
+		step := newOwnerStep()
+		sqlgraph.HasNeighborsWith(s, step, func(s *sql.Selector) {
+			for _, p := range preds {
+				p(s)
+			}
+		})
+	})
+}
+
+// And groups predicates with the AND operator between them.
+func And(predicates ...predicate.Pet) predicate.Pet {
+	return predicate.Pet(sql.AndPredicates(predicates...))
+}
+
+// Or groups predicates with the OR operator between them.
+func Or(predicates ...predicate.Pet) predicate.Pet {
+	return predicate.Pet(sql.OrPredicates(predicates...))
+}
+
+// Not applies the not operator on the given predicate.
+func Not(p predicate.Pet) predicate.Pet {
+	return predicate.Pet(sql.NotPredicates(p))
+}

examples/traversal/ent/pet_create.go

@@ -0,0 +1,255 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/pet"
+	"entgo.io/ent/examples/traversal/ent/user"
+	"entgo.io/ent/schema/field"
+)
+
+// PetCreate is the builder for creating a Pet entity.
+type PetCreate struct {
+	config
+	mutation *PetMutation
+	hooks    []Hook
+}
+
+// SetName sets the "name" field.
+func (_c *PetCreate) SetName(v string) *PetCreate {
+	_c.mutation.SetName(v)
+	return _c
+}
+
+// AddFriendIDs adds the "friends" edge to the Pet entity by IDs.
+func (_c *PetCreate) AddFriendIDs(ids ...int) *PetCreate {
+	_c.mutation.AddFriendIDs(ids...)
+	return _c
+}
+
+// AddFriends adds the "friends" edges to the Pet entity.
+func (_c *PetCreate) AddFriends(v ...*Pet) *PetCreate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _c.AddFriendIDs(ids...)
+}
+
+// SetOwnerID sets the "owner" edge to the User entity by ID.
+func (_c *PetCreate) SetOwnerID(id int) *PetCreate {
+	_c.mutation.SetOwnerID(id)
+	return _c
+}
+
+// SetNillableOwnerID sets the "owner" edge to the User entity by ID if the given value is not nil.
+func (_c *PetCreate) SetNillableOwnerID(id *int) *PetCreate {
+	if id != nil {
+		_c = _c.SetOwnerID(*id)
+	}
+	return _c
+}
+
+// SetOwner sets the "owner" edge to the User entity.
+func (_c *PetCreate) SetOwner(v *User) *PetCreate {
+	return _c.SetOwnerID(v.ID)
+}
+
+// Mutation returns the PetMutation object of the builder.
+func (_c *PetCreate) Mutation() *PetMutation {
+	return _c.mutation
+}
+
+// Save creates the Pet in the database.
+func (_c *PetCreate) Save(ctx context.Context) (*Pet, error) {
+	return withHooks(ctx, _c.sqlSave, _c.mutation, _c.hooks)
+}
+
+// SaveX calls Save and panics if Save returns an error.
+func (_c *PetCreate) SaveX(ctx context.Context) *Pet {
+	v, err := _c.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Exec executes the query.
+func (_c *PetCreate) Exec(ctx context.Context) error {
+	_, err := _c.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_c *PetCreate) ExecX(ctx context.Context) {
+	if err := _c.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
+
+// check runs all checks and user-defined validators on the builder.
+func (_c *PetCreate) check() error {
+	if _, ok := _c.mutation.Name(); !ok {
+		return &ValidationError{Name: "name", err: errors.New(`ent: missing required field "Pet.name"`)}
+	}
+	return nil
+}
+
+func (_c *PetCreate) sqlSave(ctx context.Context) (*Pet, error) {
+	if err := _c.check(); err != nil {
+		return nil, err
+	}
+	_node, _spec := _c.createSpec()
+	if err := sqlgraph.CreateNode(ctx, _c.driver, _spec); err != nil {
+		if sqlgraph.IsConstraintError(err) {
+			err = &ConstraintError{msg: err.Error(), wrap: err}
+		}
+		return nil, err
+	}
+	id := _spec.ID.Value.(int64)
+	_node.ID = int(id)
+	_c.mutation.id = &_node.ID
+	_c.mutation.done = true
+	return _node, nil
+}
+
+func (_c *PetCreate) createSpec() (*Pet, *sqlgraph.CreateSpec) {
+	var (
+		_node = &Pet{config: _c.config}
+		_spec = sqlgraph.NewCreateSpec(pet.Table, sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt))
+	)
+	if value, ok := _c.mutation.Name(); ok {
+		_spec.SetField(pet.FieldName, field.TypeString, value)
+		_node.Name = value
+	}
+	if nodes := _c.mutation.FriendsIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   pet.FriendsTable,
+			Columns: pet.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges = append(_spec.Edges, edge)
+	}
+	if nodes := _c.mutation.OwnerIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2O,
+			Inverse: true,
+			Table:   pet.OwnerTable,
+			Columns: []string{pet.OwnerColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_node.user_pets = &nodes[0]
+		_spec.Edges = append(_spec.Edges, edge)
+	}
+	return _node, _spec
+}
+
+// PetCreateBulk is the builder for creating many Pet entities in bulk.
+type PetCreateBulk struct {
+	config
+	err      error
+	builders []*PetCreate
+}
+
+// Save creates the Pet entities in the database.
+func (_c *PetCreateBulk) Save(ctx context.Context) ([]*Pet, error) {
+	if _c.err != nil {
+		return nil, _c.err
+	}
+	specs := make([]*sqlgraph.CreateSpec, len(_c.builders))
+	nodes := make([]*Pet, len(_c.builders))
+	mutators := make([]Mutator, len(_c.builders))
+	for i := range _c.builders {
+		func(i int, root context.Context) {
+			builder := _c.builders[i]
+			var mut Mutator = MutateFunc(func(ctx context.Context, m Mutation) (Value, error) {
+				mutation, ok := m.(*PetMutation)
+				if !ok {
+					return nil, fmt.Errorf("unexpected mutation type %T", m)
+				}
+				if err := builder.check(); err != nil {
+					return nil, err
+				}
+				builder.mutation = mutation
+				var err error
+				nodes[i], specs[i] = builder.createSpec()
+				if i < len(mutators)-1 {
+					_, err = mutators[i+1].Mutate(root, _c.builders[i+1].mutation)
+				} else {
+					spec := &sqlgraph.BatchCreateSpec{Nodes: specs}
+					// Invoke the actual operation on the latest mutation in the chain.
+					if err = sqlgraph.BatchCreate(ctx, _c.driver, spec); err != nil {
+						if sqlgraph.IsConstraintError(err) {
+							err = &ConstraintError{msg: err.Error(), wrap: err}
+						}
+					}
+				}
+				if err != nil {
+					return nil, err
+				}
+				mutation.id = &nodes[i].ID
+				if specs[i].ID.Value != nil {
+					id := specs[i].ID.Value.(int64)
+					nodes[i].ID = int(id)
+				}
+				mutation.done = true
+				return nodes[i], nil
+			})
+			for i := len(builder.hooks) - 1; i >= 0; i-- {
+				mut = builder.hooks[i](mut)
+			}
+			mutators[i] = mut
+		}(i, ctx)
+	}
+	if len(mutators) > 0 {
+		if _, err := mutators[0].Mutate(ctx, _c.builders[0].mutation); err != nil {
+			return nil, err
+		}
+	}
+	return nodes, nil
+}
+
+// SaveX is like Save, but panics if an error occurs.
+func (_c *PetCreateBulk) SaveX(ctx context.Context) []*Pet {
+	v, err := _c.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Exec executes the query.
+func (_c *PetCreateBulk) Exec(ctx context.Context) error {
+	_, err := _c.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_c *PetCreateBulk) ExecX(ctx context.Context) {
+	if err := _c.Exec(ctx); err != nil {
+		panic(err)
+	}
+}

examples/traversal/ent/pet_delete.go

@@ -0,0 +1,92 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/pet"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+	"entgo.io/ent/schema/field"
+)
+
+// PetDelete is the builder for deleting a Pet entity.
+type PetDelete struct {
+	config
+	hooks    []Hook
+	mutation *PetMutation
+}
+
+// Where appends a list predicates to the PetDelete builder.
+func (_d *PetDelete) Where(ps ...predicate.Pet) *PetDelete {
+	_d.mutation.Where(ps...)
+	return _d
+}
+
+// Exec executes the deletion query and returns how many vertices were deleted.
+func (_d *PetDelete) Exec(ctx context.Context) (int, error) {
+	return withHooks(ctx, _d.sqlExec, _d.mutation, _d.hooks)
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_d *PetDelete) ExecX(ctx context.Context) int {
+	n, err := _d.Exec(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}
+
+func (_d *PetDelete) sqlExec(ctx context.Context) (int, error) {
+	_spec := sqlgraph.NewDeleteSpec(pet.Table, sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt))
+	if ps := _d.mutation.Predicates(); len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	affected, err := sqlgraph.DeleteNodes(ctx, _d.driver, _spec)
+	if err != nil && sqlgraph.IsConstraintError(err) {
+		err = &ConstraintError{msg: err.Error(), wrap: err}
+	}
+	_d.mutation.done = true
+	return affected, err
+}
+
+// PetDeleteOne is the builder for deleting a single Pet entity.
+type PetDeleteOne struct {
+	_d *PetDelete
+}
+
+// Where appends a list predicates to the PetDelete builder.
+func (_d *PetDeleteOne) Where(ps ...predicate.Pet) *PetDeleteOne {
+	_d._d.mutation.Where(ps...)
+	return _d
+}
+
+// Exec executes the deletion query.
+func (_d *PetDeleteOne) Exec(ctx context.Context) error {
+	n, err := _d._d.Exec(ctx)
+	switch {
+	case err != nil:
+		return err
+	case n == 0:
+		return &NotFoundError{pet.Label}
+	default:
+		return nil
+	}
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_d *PetDeleteOne) ExecX(ctx context.Context) {
+	if err := _d.Exec(ctx); err != nil {
+		panic(err)
+	}
+}

examples/traversal/ent/pet_query.go

@@ -0,0 +1,723 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"database/sql/driver"
+	"fmt"
+	"math"
+
+	"entgo.io/ent"
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/pet"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+	"entgo.io/ent/examples/traversal/ent/user"
+	"entgo.io/ent/schema/field"
+)
+
+// PetQuery is the builder for querying Pet entities.
+type PetQuery struct {
+	config
+	ctx         *QueryContext
+	order       []pet.OrderOption
+	inters      []Interceptor
+	predicates  []predicate.Pet
+	withFriends *PetQuery
+	withOwner   *UserQuery
+	withFKs     bool
+	// intermediate query (i.e. traversal path).
+	sql  *sql.Selector
+	path func(context.Context) (*sql.Selector, error)
+}
+
+// Where adds a new predicate for the PetQuery builder.
+func (_q *PetQuery) Where(ps ...predicate.Pet) *PetQuery {
+	_q.predicates = append(_q.predicates, ps...)
+	return _q
+}
+
+// Limit the number of records to be returned by this query.
+func (_q *PetQuery) Limit(limit int) *PetQuery {
+	_q.ctx.Limit = &limit
+	return _q
+}
+
+// Offset to start from.
+func (_q *PetQuery) Offset(offset int) *PetQuery {
+	_q.ctx.Offset = &offset
+	return _q
+}
+
+// Unique configures the query builder to filter duplicate records on query.
+// By default, unique is set to true, and can be disabled using this method.
+func (_q *PetQuery) Unique(unique bool) *PetQuery {
+	_q.ctx.Unique = &unique
+	return _q
+}
+
+// Order specifies how the records should be ordered.
+func (_q *PetQuery) Order(o ...pet.OrderOption) *PetQuery {
+	_q.order = append(_q.order, o...)
+	return _q
+}
+
+// QueryFriends chains the current query on the "friends" edge.
+func (_q *PetQuery) QueryFriends() *PetQuery {
+	query := (&PetClient{config: _q.config}).Query()
+	query.path = func(ctx context.Context) (fromU *sql.Selector, err error) {
+		if err := _q.prepareQuery(ctx); err != nil {
+			return nil, err
+		}
+		selector := _q.sqlQuery(ctx)
+		if err := selector.Err(); err != nil {
+			return nil, err
+		}
+		step := sqlgraph.NewStep(
+			sqlgraph.From(pet.Table, pet.FieldID, selector),
+			sqlgraph.To(pet.Table, pet.FieldID),
+			sqlgraph.Edge(sqlgraph.M2M, false, pet.FriendsTable, pet.FriendsPrimaryKey...),
+		)
+		fromU = sqlgraph.SetNeighbors(_q.driver.Dialect(), step)
+		return fromU, nil
+	}
+	return query
+}
+
+// QueryOwner chains the current query on the "owner" edge.
+func (_q *PetQuery) QueryOwner() *UserQuery {
+	query := (&UserClient{config: _q.config}).Query()
+	query.path = func(ctx context.Context) (fromU *sql.Selector, err error) {
+		if err := _q.prepareQuery(ctx); err != nil {
+			return nil, err
+		}
+		selector := _q.sqlQuery(ctx)
+		if err := selector.Err(); err != nil {
+			return nil, err
+		}
+		step := sqlgraph.NewStep(
+			sqlgraph.From(pet.Table, pet.FieldID, selector),
+			sqlgraph.To(user.Table, user.FieldID),
+			sqlgraph.Edge(sqlgraph.M2O, true, pet.OwnerTable, pet.OwnerColumn),
+		)
+		fromU = sqlgraph.SetNeighbors(_q.driver.Dialect(), step)
+		return fromU, nil
+	}
+	return query
+}
+
+// First returns the first Pet entity from the query.
+// Returns a *NotFoundError when no Pet was found.
+func (_q *PetQuery) First(ctx context.Context) (*Pet, error) {
+	nodes, err := _q.Limit(1).All(setContextOp(ctx, _q.ctx, ent.OpQueryFirst))
+	if err != nil {
+		return nil, err
+	}
+	if len(nodes) == 0 {
+		return nil, &NotFoundError{pet.Label}
+	}
+	return nodes[0], nil
+}
+
+// FirstX is like First, but panics if an error occurs.
+func (_q *PetQuery) FirstX(ctx context.Context) *Pet {
+	node, err := _q.First(ctx)
+	if err != nil && !IsNotFound(err) {
+		panic(err)
+	}
+	return node
+}
+
+// FirstID returns the first Pet ID from the query.
+// Returns a *NotFoundError when no Pet ID was found.
+func (_q *PetQuery) FirstID(ctx context.Context) (id int, err error) {
+	var ids []int
+	if ids, err = _q.Limit(1).IDs(setContextOp(ctx, _q.ctx, ent.OpQueryFirstID)); err != nil {
+		return
+	}
+	if len(ids) == 0 {
+		err = &NotFoundError{pet.Label}
+		return
+	}
+	return ids[0], nil
+}
+
+// FirstIDX is like FirstID, but panics if an error occurs.
+func (_q *PetQuery) FirstIDX(ctx context.Context) int {
+	id, err := _q.FirstID(ctx)
+	if err != nil && !IsNotFound(err) {
+		panic(err)
+	}
+	return id
+}
+
+// Only returns a single Pet entity found by the query, ensuring it only returns one.
+// Returns a *NotSingularError when more than one Pet entity is found.
+// Returns a *NotFoundError when no Pet entities are found.
+func (_q *PetQuery) Only(ctx context.Context) (*Pet, error) {
+	nodes, err := _q.Limit(2).All(setContextOp(ctx, _q.ctx, ent.OpQueryOnly))
+	if err != nil {
+		return nil, err
+	}
+	switch len(nodes) {
+	case 1:
+		return nodes[0], nil
+	case 0:
+		return nil, &NotFoundError{pet.Label}
+	default:
+		return nil, &NotSingularError{pet.Label}
+	}
+}
+
+// OnlyX is like Only, but panics if an error occurs.
+func (_q *PetQuery) OnlyX(ctx context.Context) *Pet {
+	node, err := _q.Only(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return node
+}
+
+// OnlyID is like Only, but returns the only Pet ID in the query.
+// Returns a *NotSingularError when more than one Pet ID is found.
+// Returns a *NotFoundError when no entities are found.
+func (_q *PetQuery) OnlyID(ctx context.Context) (id int, err error) {
+	var ids []int
+	if ids, err = _q.Limit(2).IDs(setContextOp(ctx, _q.ctx, ent.OpQueryOnlyID)); err != nil {
+		return
+	}
+	switch len(ids) {
+	case 1:
+		id = ids[0]
+	case 0:
+		err = &NotFoundError{pet.Label}
+	default:
+		err = &NotSingularError{pet.Label}
+	}
+	return
+}
+
+// OnlyIDX is like OnlyID, but panics if an error occurs.
+func (_q *PetQuery) OnlyIDX(ctx context.Context) int {
+	id, err := _q.OnlyID(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return id
+}
+
+// All executes the query and returns a list of Pets.
+func (_q *PetQuery) All(ctx context.Context) ([]*Pet, error) {
+	ctx = setContextOp(ctx, _q.ctx, ent.OpQueryAll)
+	if err := _q.prepareQuery(ctx); err != nil {
+		return nil, err
+	}
+	qr := querierAll[[]*Pet, *PetQuery]()
+	return withInterceptors[[]*Pet](ctx, _q, qr, _q.inters)
+}
+
+// AllX is like All, but panics if an error occurs.
+func (_q *PetQuery) AllX(ctx context.Context) []*Pet {
+	nodes, err := _q.All(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return nodes
+}
+
+// IDs executes the query and returns a list of Pet IDs.
+func (_q *PetQuery) IDs(ctx context.Context) (ids []int, err error) {
+	if _q.ctx.Unique == nil && _q.path != nil {
+		_q.Unique(true)
+	}
+	ctx = setContextOp(ctx, _q.ctx, ent.OpQueryIDs)
+	if err = _q.Select(pet.FieldID).Scan(ctx, &ids); err != nil {
+		return nil, err
+	}
+	return ids, nil
+}
+
+// IDsX is like IDs, but panics if an error occurs.
+func (_q *PetQuery) IDsX(ctx context.Context) []int {
+	ids, err := _q.IDs(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return ids
+}
+
+// Count returns the count of the given query.
+func (_q *PetQuery) Count(ctx context.Context) (int, error) {
+	ctx = setContextOp(ctx, _q.ctx, ent.OpQueryCount)
+	if err := _q.prepareQuery(ctx); err != nil {
+		return 0, err
+	}
+	return withInterceptors[int](ctx, _q, querierCount[*PetQuery](), _q.inters)
+}
+
+// CountX is like Count, but panics if an error occurs.
+func (_q *PetQuery) CountX(ctx context.Context) int {
+	count, err := _q.Count(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return count
+}
+
+// Exist returns true if the query has elements in the graph.
+func (_q *PetQuery) Exist(ctx context.Context) (bool, error) {
+	ctx = setContextOp(ctx, _q.ctx, ent.OpQueryExist)
+	switch _, err := _q.FirstID(ctx); {
+	case IsNotFound(err):
+		return false, nil
+	case err != nil:
+		return false, fmt.Errorf("ent: check existence: %w", err)
+	default:
+		return true, nil
+	}
+}
+
+// ExistX is like Exist, but panics if an error occurs.
+func (_q *PetQuery) ExistX(ctx context.Context) bool {
+	exist, err := _q.Exist(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return exist
+}
+
+// Clone returns a duplicate of the PetQuery builder, including all associated steps. It can be
+// used to prepare common query builders and use them differently after the clone is made.
+func (_q *PetQuery) Clone() *PetQuery {
+	if _q == nil {
+		return nil
+	}
+	return &PetQuery{
+		config:      _q.config,
+		ctx:         _q.ctx.Clone(),
+		order:       append([]pet.OrderOption{}, _q.order...),
+		inters:      append([]Interceptor{}, _q.inters...),
+		predicates:  append([]predicate.Pet{}, _q.predicates...),
+		withFriends: _q.withFriends.Clone(),
+		withOwner:   _q.withOwner.Clone(),
+		// clone intermediate query.
+		sql:  _q.sql.Clone(),
+		path: _q.path,
+	}
+}
+
+// WithFriends tells the query-builder to eager-load the nodes that are connected to
+// the "friends" edge. The optional arguments are used to configure the query builder of the edge.
+func (_q *PetQuery) WithFriends(opts ...func(*PetQuery)) *PetQuery {
+	query := (&PetClient{config: _q.config}).Query()
+	for _, opt := range opts {
+		opt(query)
+	}
+	_q.withFriends = query
+	return _q
+}
+
+// WithOwner tells the query-builder to eager-load the nodes that are connected to
+// the "owner" edge. The optional arguments are used to configure the query builder of the edge.
+func (_q *PetQuery) WithOwner(opts ...func(*UserQuery)) *PetQuery {
+	query := (&UserClient{config: _q.config}).Query()
+	for _, opt := range opts {
+		opt(query)
+	}
+	_q.withOwner = query
+	return _q
+}
+
+// GroupBy is used to group vertices by one or more fields/columns.
+// It is often used with aggregate functions, like: count, max, mean, min, sum.
+//
+// Example:
+//
+//	var v []struct {
+//		Name string `json:"name,omitempty"`
+//		Count int `json:"count,omitempty"`
+//	}
+//
+//	client.Pet.Query().
+//		GroupBy(pet.FieldName).
+//		Aggregate(ent.Count()).
+//		Scan(ctx, &v)
+func (_q *PetQuery) GroupBy(field string, fields ...string) *PetGroupBy {
+	_q.ctx.Fields = append([]string{field}, fields...)
+	grbuild := &PetGroupBy{build: _q}
+	grbuild.flds = &_q.ctx.Fields
+	grbuild.label = pet.Label
+	grbuild.scan = grbuild.Scan
+	return grbuild
+}
+
+// Select allows the selection one or more fields/columns for the given query,
+// instead of selecting all fields in the entity.
+//
+// Example:
+//
+//	var v []struct {
+//		Name string `json:"name,omitempty"`
+//	}
+//
+//	client.Pet.Query().
+//		Select(pet.FieldName).
+//		Scan(ctx, &v)
+func (_q *PetQuery) Select(fields ...string) *PetSelect {
+	_q.ctx.Fields = append(_q.ctx.Fields, fields...)
+	sbuild := &PetSelect{PetQuery: _q}
+	sbuild.label = pet.Label
+	sbuild.flds, sbuild.scan = &_q.ctx.Fields, sbuild.Scan
+	return sbuild
+}
+
+// Aggregate returns a PetSelect configured with the given aggregations.
+func (_q *PetQuery) Aggregate(fns ...AggregateFunc) *PetSelect {
+	return _q.Select().Aggregate(fns...)
+}
+
+func (_q *PetQuery) prepareQuery(ctx context.Context) error {
+	for _, inter := range _q.inters {
+		if inter == nil {
+			return fmt.Errorf("ent: uninitialized interceptor (forgotten import ent/runtime?)")
+		}
+		if trv, ok := inter.(Traverser); ok {
+			if err := trv.Traverse(ctx, _q); err != nil {
+				return err
+			}
+		}
+	}
+	for _, f := range _q.ctx.Fields {
+		if !pet.ValidColumn(f) {
+			return &ValidationError{Name: f, err: fmt.Errorf("ent: invalid field %q for query", f)}
+		}
+	}
+	if _q.path != nil {
+		prev, err := _q.path(ctx)
+		if err != nil {
+			return err
+		}
+		_q.sql = prev
+	}
+	return nil
+}
+
+func (_q *PetQuery) sqlAll(ctx context.Context, hooks ...queryHook) ([]*Pet, error) {
+	var (
+		nodes       = []*Pet{}
+		withFKs     = _q.withFKs
+		_spec       = _q.querySpec()
+		loadedTypes = [2]bool{
+			_q.withFriends != nil,
+			_q.withOwner != nil,
+		}
+	)
+	if _q.withOwner != nil {
+		withFKs = true
+	}
+	if withFKs {
+		_spec.Node.Columns = append(_spec.Node.Columns, pet.ForeignKeys...)
+	}
+	_spec.ScanValues = func(columns []string) ([]any, error) {
+		return (*Pet).scanValues(nil, columns)
+	}
+	_spec.Assign = func(columns []string, values []any) error {
+		node := &Pet{config: _q.config}
+		nodes = append(nodes, node)
+		node.Edges.loadedTypes = loadedTypes
+		return node.assignValues(columns, values)
+	}
+	for i := range hooks {
+		hooks[i](ctx, _spec)
+	}
+	if err := sqlgraph.QueryNodes(ctx, _q.driver, _spec); err != nil {
+		return nil, err
+	}
+	if len(nodes) == 0 {
+		return nodes, nil
+	}
+	if query := _q.withFriends; query != nil {
+		if err := _q.loadFriends(ctx, query, nodes,
+			func(n *Pet) { n.Edges.Friends = []*Pet{} },
+			func(n *Pet, e *Pet) { n.Edges.Friends = append(n.Edges.Friends, e) }); err != nil {
+			return nil, err
+		}
+	}
+	if query := _q.withOwner; query != nil {
+		if err := _q.loadOwner(ctx, query, nodes, nil,
+			func(n *Pet, e *User) { n.Edges.Owner = e }); err != nil {
+			return nil, err
+		}
+	}
+	return nodes, nil
+}
+
+func (_q *PetQuery) loadFriends(ctx context.Context, query *PetQuery, nodes []*Pet, init func(*Pet), assign func(*Pet, *Pet)) error {
+	edgeIDs := make([]driver.Value, len(nodes))
+	byID := make(map[int]*Pet)
+	nids := make(map[int]map[*Pet]struct{})
+	for i, node := range nodes {
+		edgeIDs[i] = node.ID
+		byID[node.ID] = node
+		if init != nil {
+			init(node)
+		}
+	}
+	query.Where(func(s *sql.Selector) {
+		joinT := sql.Table(pet.FriendsTable)
+		s.Join(joinT).On(s.C(pet.FieldID), joinT.C(pet.FriendsPrimaryKey[1]))
+		s.Where(sql.InValues(joinT.C(pet.FriendsPrimaryKey[0]), edgeIDs...))
+		columns := s.SelectedColumns()
+		s.Select(joinT.C(pet.FriendsPrimaryKey[0]))
+		s.AppendSelect(columns...)
+		s.SetDistinct(false)
+	})
+	if err := query.prepareQuery(ctx); err != nil {
+		return err
+	}
+	qr := QuerierFunc(func(ctx context.Context, q Query) (Value, error) {
+		return query.sqlAll(ctx, func(_ context.Context, spec *sqlgraph.QuerySpec) {
+			assign := spec.Assign
+			values := spec.ScanValues
+			spec.ScanValues = func(columns []string) ([]any, error) {
+				values, err := values(columns[1:])
+				if err != nil {
+					return nil, err
+				}
+				return append([]any{new(sql.NullInt64)}, values...), nil
+			}
+			spec.Assign = func(columns []string, values []any) error {
+				outValue := int(values[0].(*sql.NullInt64).Int64)
+				inValue := int(values[1].(*sql.NullInt64).Int64)
+				if nids[inValue] == nil {
+					nids[inValue] = map[*Pet]struct{}{byID[outValue]: {}}
+					return assign(columns[1:], values[1:])
+				}
+				nids[inValue][byID[outValue]] = struct{}{}
+				return nil
+			}
+		})
+	})
+	neighbors, err := withInterceptors[[]*Pet](ctx, query, qr, query.inters)
+	if err != nil {
+		return err
+	}
+	for _, n := range neighbors {
+		nodes, ok := nids[n.ID]
+		if !ok {
+			return fmt.Errorf(`unexpected "friends" node returned %v`, n.ID)
+		}
+		for kn := range nodes {
+			assign(kn, n)
+		}
+	}
+	return nil
+}
+func (_q *PetQuery) loadOwner(ctx context.Context, query *UserQuery, nodes []*Pet, init func(*Pet), assign func(*Pet, *User)) error {
+	ids := make([]int, 0, len(nodes))
+	nodeids := make(map[int][]*Pet)
+	for i := range nodes {
+		if nodes[i].user_pets == nil {
+			continue
+		}
+		fk := *nodes[i].user_pets
+		if _, ok := nodeids[fk]; !ok {
+			ids = append(ids, fk)
+		}
+		nodeids[fk] = append(nodeids[fk], nodes[i])
+	}
+	if len(ids) == 0 {
+		return nil
+	}
+	query.Where(user.IDIn(ids...))
+	neighbors, err := query.All(ctx)
+	if err != nil {
+		return err
+	}
+	for _, n := range neighbors {
+		nodes, ok := nodeids[n.ID]
+		if !ok {
+			return fmt.Errorf(`unexpected foreign-key "user_pets" returned %v`, n.ID)
+		}
+		for i := range nodes {
+			assign(nodes[i], n)
+		}
+	}
+	return nil
+}
+
+func (_q *PetQuery) sqlCount(ctx context.Context) (int, error) {
+	_spec := _q.querySpec()
+	_spec.Node.Columns = _q.ctx.Fields
+	if len(_q.ctx.Fields) > 0 {
+		_spec.Unique = _q.ctx.Unique != nil && *_q.ctx.Unique
+	}
+	return sqlgraph.CountNodes(ctx, _q.driver, _spec)
+}
+
+func (_q *PetQuery) querySpec() *sqlgraph.QuerySpec {
+	_spec := sqlgraph.NewQuerySpec(pet.Table, pet.Columns, sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt))
+	_spec.From = _q.sql
+	if unique := _q.ctx.Unique; unique != nil {
+		_spec.Unique = *unique
+	} else if _q.path != nil {
+		_spec.Unique = true
+	}
+	if fields := _q.ctx.Fields; len(fields) > 0 {
+		_spec.Node.Columns = make([]string, 0, len(fields))
+		_spec.Node.Columns = append(_spec.Node.Columns, pet.FieldID)
+		for i := range fields {
+			if fields[i] != pet.FieldID {
+				_spec.Node.Columns = append(_spec.Node.Columns, fields[i])
+			}
+		}
+	}
+	if ps := _q.predicates; len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	if limit := _q.ctx.Limit; limit != nil {
+		_spec.Limit = *limit
+	}
+	if offset := _q.ctx.Offset; offset != nil {
+		_spec.Offset = *offset
+	}
+	if ps := _q.order; len(ps) > 0 {
+		_spec.Order = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	return _spec
+}
+
+func (_q *PetQuery) sqlQuery(ctx context.Context) *sql.Selector {
+	builder := sql.Dialect(_q.driver.Dialect())
+	t1 := builder.Table(pet.Table)
+	columns := _q.ctx.Fields
+	if len(columns) == 0 {
+		columns = pet.Columns
+	}
+	selector := builder.Select(t1.Columns(columns...)...).From(t1)
+	if _q.sql != nil {
+		selector = _q.sql
+		selector.Select(selector.Columns(columns...)...)
+	}
+	if _q.ctx.Unique != nil && *_q.ctx.Unique {
+		selector.Distinct()
+	}
+	for _, p := range _q.predicates {
+		p(selector)
+	}
+	for _, p := range _q.order {
+		p(selector)
+	}
+	if offset := _q.ctx.Offset; offset != nil {
+		// limit is mandatory for offset clause. We start
+		// with default value, and override it below if needed.
+		selector.Offset(*offset).Limit(math.MaxInt32)
+	}
+	if limit := _q.ctx.Limit; limit != nil {
+		selector.Limit(*limit)
+	}
+	return selector
+}
+
+// PetGroupBy is the group-by builder for Pet entities.
+type PetGroupBy struct {
+	selector
+	build *PetQuery
+}
+
+// Aggregate adds the given aggregation functions to the group-by query.
+func (_g *PetGroupBy) Aggregate(fns ...AggregateFunc) *PetGroupBy {
+	_g.fns = append(_g.fns, fns...)
+	return _g
+}
+
+// Scan applies the selector query and scans the result into the given value.
+func (_g *PetGroupBy) Scan(ctx context.Context, v any) error {
+	ctx = setContextOp(ctx, _g.build.ctx, ent.OpQueryGroupBy)
+	if err := _g.build.prepareQuery(ctx); err != nil {
+		return err
+	}
+	return scanWithInterceptors[*PetQuery, *PetGroupBy](ctx, _g.build, _g, _g.build.inters, v)
+}
+
+func (_g *PetGroupBy) sqlScan(ctx context.Context, root *PetQuery, v any) error {
+	selector := root.sqlQuery(ctx).Select()
+	aggregation := make([]string, 0, len(_g.fns))
+	for _, fn := range _g.fns {
+		aggregation = append(aggregation, fn(selector))
+	}
+	if len(selector.SelectedColumns()) == 0 {
+		columns := make([]string, 0, len(*_g.flds)+len(_g.fns))
+		for _, f := range *_g.flds {
+			columns = append(columns, selector.C(f))
+		}
+		columns = append(columns, aggregation...)
+		selector.Select(columns...)
+	}
+	selector.GroupBy(selector.Columns(*_g.flds...)...)
+	if err := selector.Err(); err != nil {
+		return err
+	}
+	rows := &sql.Rows{}
+	query, args := selector.Query()
+	if err := _g.build.driver.Query(ctx, query, args, rows); err != nil {
+		return err
+	}
+	defer rows.Close()
+	return sql.ScanSlice(rows, v)
+}
+
+// PetSelect is the builder for selecting fields of Pet entities.
+type PetSelect struct {
+	*PetQuery
+	selector
+}
+
+// Aggregate adds the given aggregation functions to the selector query.
+func (_s *PetSelect) Aggregate(fns ...AggregateFunc) *PetSelect {
+	_s.fns = append(_s.fns, fns...)
+	return _s
+}
+
+// Scan applies the selector query and scans the result into the given value.
+func (_s *PetSelect) Scan(ctx context.Context, v any) error {
+	ctx = setContextOp(ctx, _s.ctx, ent.OpQuerySelect)
+	if err := _s.prepareQuery(ctx); err != nil {
+		return err
+	}
+	return scanWithInterceptors[*PetQuery, *PetSelect](ctx, _s.PetQuery, _s, _s.inters, v)
+}
+
+func (_s *PetSelect) sqlScan(ctx context.Context, root *PetQuery, v any) error {
+	selector := root.sqlQuery(ctx)
+	aggregation := make([]string, 0, len(_s.fns))
+	for _, fn := range _s.fns {
+		aggregation = append(aggregation, fn(selector))
+	}
+	switch n := len(*_s.selector.flds); {
+	case n == 0 && len(aggregation) > 0:
+		selector.Select(aggregation...)
+	case n != 0 && len(aggregation) > 0:
+		selector.AppendSelect(aggregation...)
+	}
+	rows := &sql.Rows{}
+	query, args := selector.Query()
+	if err := _s.driver.Query(ctx, query, args, rows); err != nil {
+		return err
+	}
+	defer rows.Close()
+	return sql.ScanSlice(rows, v)
+}

examples/traversal/ent/pet_update.go

@@ -0,0 +1,484 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/pet"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+	"entgo.io/ent/examples/traversal/ent/user"
+	"entgo.io/ent/schema/field"
+)
+
+// PetUpdate is the builder for updating Pet entities.
+type PetUpdate struct {
+	config
+	hooks    []Hook
+	mutation *PetMutation
+}
+
+// Where appends a list predicates to the PetUpdate builder.
+func (_u *PetUpdate) Where(ps ...predicate.Pet) *PetUpdate {
+	_u.mutation.Where(ps...)
+	return _u
+}
+
+// SetName sets the "name" field.
+func (_u *PetUpdate) SetName(v string) *PetUpdate {
+	_u.mutation.SetName(v)
+	return _u
+}
+
+// SetNillableName sets the "name" field if the given value is not nil.
+func (_u *PetUpdate) SetNillableName(v *string) *PetUpdate {
+	if v != nil {
+		_u.SetName(*v)
+	}
+	return _u
+}
+
+// AddFriendIDs adds the "friends" edge to the Pet entity by IDs.
+func (_u *PetUpdate) AddFriendIDs(ids ...int) *PetUpdate {
+	_u.mutation.AddFriendIDs(ids...)
+	return _u
+}
+
+// AddFriends adds the "friends" edges to the Pet entity.
+func (_u *PetUpdate) AddFriends(v ...*Pet) *PetUpdate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.AddFriendIDs(ids...)
+}
+
+// SetOwnerID sets the "owner" edge to the User entity by ID.
+func (_u *PetUpdate) SetOwnerID(id int) *PetUpdate {
+	_u.mutation.SetOwnerID(id)
+	return _u
+}
+
+// SetNillableOwnerID sets the "owner" edge to the User entity by ID if the given value is not nil.
+func (_u *PetUpdate) SetNillableOwnerID(id *int) *PetUpdate {
+	if id != nil {
+		_u = _u.SetOwnerID(*id)
+	}
+	return _u
+}
+
+// SetOwner sets the "owner" edge to the User entity.
+func (_u *PetUpdate) SetOwner(v *User) *PetUpdate {
+	return _u.SetOwnerID(v.ID)
+}
+
+// Mutation returns the PetMutation object of the builder.
+func (_u *PetUpdate) Mutation() *PetMutation {
+	return _u.mutation
+}
+
+// ClearFriends clears all "friends" edges to the Pet entity.
+func (_u *PetUpdate) ClearFriends() *PetUpdate {
+	_u.mutation.ClearFriends()
+	return _u
+}
+
+// RemoveFriendIDs removes the "friends" edge to Pet entities by IDs.
+func (_u *PetUpdate) RemoveFriendIDs(ids ...int) *PetUpdate {
+	_u.mutation.RemoveFriendIDs(ids...)
+	return _u
+}
+
+// RemoveFriends removes "friends" edges to Pet entities.
+func (_u *PetUpdate) RemoveFriends(v ...*Pet) *PetUpdate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.RemoveFriendIDs(ids...)
+}
+
+// ClearOwner clears the "owner" edge to the User entity.
+func (_u *PetUpdate) ClearOwner() *PetUpdate {
+	_u.mutation.ClearOwner()
+	return _u
+}
+
+// Save executes the query and returns the number of nodes affected by the update operation.
+func (_u *PetUpdate) Save(ctx context.Context) (int, error) {
+	return withHooks(ctx, _u.sqlSave, _u.mutation, _u.hooks)
+}
+
+// SaveX is like Save, but panics if an error occurs.
+func (_u *PetUpdate) SaveX(ctx context.Context) int {
+	affected, err := _u.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return affected
+}
+
+// Exec executes the query.
+func (_u *PetUpdate) Exec(ctx context.Context) error {
+	_, err := _u.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_u *PetUpdate) ExecX(ctx context.Context) {
+	if err := _u.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
+
+func (_u *PetUpdate) sqlSave(ctx context.Context) (_node int, err error) {
+	_spec := sqlgraph.NewUpdateSpec(pet.Table, pet.Columns, sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt))
+	if ps := _u.mutation.Predicates(); len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	if value, ok := _u.mutation.Name(); ok {
+		_spec.SetField(pet.FieldName, field.TypeString, value)
+	}
+	if _u.mutation.FriendsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   pet.FriendsTable,
+			Columns: pet.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.RemovedFriendsIDs(); len(nodes) > 0 && !_u.mutation.FriendsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   pet.FriendsTable,
+			Columns: pet.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.FriendsIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   pet.FriendsTable,
+			Columns: pet.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	if _u.mutation.OwnerCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2O,
+			Inverse: true,
+			Table:   pet.OwnerTable,
+			Columns: []string{pet.OwnerColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.OwnerIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2O,
+			Inverse: true,
+			Table:   pet.OwnerTable,
+			Columns: []string{pet.OwnerColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	if _node, err = sqlgraph.UpdateNodes(ctx, _u.driver, _spec); err != nil {
+		if _, ok := err.(*sqlgraph.NotFoundError); ok {
+			err = &NotFoundError{pet.Label}
+		} else if sqlgraph.IsConstraintError(err) {
+			err = &ConstraintError{msg: err.Error(), wrap: err}
+		}
+		return 0, err
+	}
+	_u.mutation.done = true
+	return _node, nil
+}
+
+// PetUpdateOne is the builder for updating a single Pet entity.
+type PetUpdateOne struct {
+	config
+	fields   []string
+	hooks    []Hook
+	mutation *PetMutation
+}
+
+// SetName sets the "name" field.
+func (_u *PetUpdateOne) SetName(v string) *PetUpdateOne {
+	_u.mutation.SetName(v)
+	return _u
+}
+
+// SetNillableName sets the "name" field if the given value is not nil.
+func (_u *PetUpdateOne) SetNillableName(v *string) *PetUpdateOne {
+	if v != nil {
+		_u.SetName(*v)
+	}
+	return _u
+}
+
+// AddFriendIDs adds the "friends" edge to the Pet entity by IDs.
+func (_u *PetUpdateOne) AddFriendIDs(ids ...int) *PetUpdateOne {
+	_u.mutation.AddFriendIDs(ids...)
+	return _u
+}
+
+// AddFriends adds the "friends" edges to the Pet entity.
+func (_u *PetUpdateOne) AddFriends(v ...*Pet) *PetUpdateOne {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.AddFriendIDs(ids...)
+}
+
+// SetOwnerID sets the "owner" edge to the User entity by ID.
+func (_u *PetUpdateOne) SetOwnerID(id int) *PetUpdateOne {
+	_u.mutation.SetOwnerID(id)
+	return _u
+}
+
+// SetNillableOwnerID sets the "owner" edge to the User entity by ID if the given value is not nil.
+func (_u *PetUpdateOne) SetNillableOwnerID(id *int) *PetUpdateOne {
+	if id != nil {
+		_u = _u.SetOwnerID(*id)
+	}
+	return _u
+}
+
+// SetOwner sets the "owner" edge to the User entity.
+func (_u *PetUpdateOne) SetOwner(v *User) *PetUpdateOne {
+	return _u.SetOwnerID(v.ID)
+}
+
+// Mutation returns the PetMutation object of the builder.
+func (_u *PetUpdateOne) Mutation() *PetMutation {
+	return _u.mutation
+}
+
+// ClearFriends clears all "friends" edges to the Pet entity.
+func (_u *PetUpdateOne) ClearFriends() *PetUpdateOne {
+	_u.mutation.ClearFriends()
+	return _u
+}
+
+// RemoveFriendIDs removes the "friends" edge to Pet entities by IDs.
+func (_u *PetUpdateOne) RemoveFriendIDs(ids ...int) *PetUpdateOne {
+	_u.mutation.RemoveFriendIDs(ids...)
+	return _u
+}
+
+// RemoveFriends removes "friends" edges to Pet entities.
+func (_u *PetUpdateOne) RemoveFriends(v ...*Pet) *PetUpdateOne {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.RemoveFriendIDs(ids...)
+}
+
+// ClearOwner clears the "owner" edge to the User entity.
+func (_u *PetUpdateOne) ClearOwner() *PetUpdateOne {
+	_u.mutation.ClearOwner()
+	return _u
+}
+
+// Where appends a list predicates to the PetUpdate builder.
+func (_u *PetUpdateOne) Where(ps ...predicate.Pet) *PetUpdateOne {
+	_u.mutation.Where(ps...)
+	return _u
+}
+
+// Select allows selecting one or more fields (columns) of the returned entity.
+// The default is selecting all fields defined in the entity schema.
+func (_u *PetUpdateOne) Select(field string, fields ...string) *PetUpdateOne {
+	_u.fields = append([]string{field}, fields...)
+	return _u
+}
+
+// Save executes the query and returns the updated Pet entity.
+func (_u *PetUpdateOne) Save(ctx context.Context) (*Pet, error) {
+	return withHooks(ctx, _u.sqlSave, _u.mutation, _u.hooks)
+}
+
+// SaveX is like Save, but panics if an error occurs.
+func (_u *PetUpdateOne) SaveX(ctx context.Context) *Pet {
+	node, err := _u.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return node
+}
+
+// Exec executes the query on the entity.
+func (_u *PetUpdateOne) Exec(ctx context.Context) error {
+	_, err := _u.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_u *PetUpdateOne) ExecX(ctx context.Context) {
+	if err := _u.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
+
+func (_u *PetUpdateOne) sqlSave(ctx context.Context) (_node *Pet, err error) {
+	_spec := sqlgraph.NewUpdateSpec(pet.Table, pet.Columns, sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt))
+	id, ok := _u.mutation.ID()
+	if !ok {
+		return nil, &ValidationError{Name: "id", err: errors.New(`ent: missing "Pet.id" for update`)}
+	}
+	_spec.Node.ID.Value = id
+	if fields := _u.fields; len(fields) > 0 {
+		_spec.Node.Columns = make([]string, 0, len(fields))
+		_spec.Node.Columns = append(_spec.Node.Columns, pet.FieldID)
+		for _, f := range fields {
+			if !pet.ValidColumn(f) {
+				return nil, &ValidationError{Name: f, err: fmt.Errorf("ent: invalid field %q for query", f)}
+			}
+			if f != pet.FieldID {
+				_spec.Node.Columns = append(_spec.Node.Columns, f)
+			}
+		}
+	}
+	if ps := _u.mutation.Predicates(); len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	if value, ok := _u.mutation.Name(); ok {
+		_spec.SetField(pet.FieldName, field.TypeString, value)
+	}
+	if _u.mutation.FriendsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   pet.FriendsTable,
+			Columns: pet.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.RemovedFriendsIDs(); len(nodes) > 0 && !_u.mutation.FriendsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   pet.FriendsTable,
+			Columns: pet.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.FriendsIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   pet.FriendsTable,
+			Columns: pet.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	if _u.mutation.OwnerCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2O,
+			Inverse: true,
+			Table:   pet.OwnerTable,
+			Columns: []string{pet.OwnerColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.OwnerIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2O,
+			Inverse: true,
+			Table:   pet.OwnerTable,
+			Columns: []string{pet.OwnerColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	_node = &Pet{config: _u.config}
+	_spec.Assign = _node.assignValues
+	_spec.ScanValues = _node.scanValues
+	if err = sqlgraph.UpdateNode(ctx, _u.driver, _spec); err != nil {
+		if _, ok := err.(*sqlgraph.NotFoundError); ok {
+			err = &NotFoundError{pet.Label}
+		} else if sqlgraph.IsConstraintError(err) {
+			err = &ConstraintError{msg: err.Error(), wrap: err}
+		}
+		return nil, err
+	}
+	_u.mutation.done = true
+	return _node, nil
+}

examples/traversal/ent/predicate/predicate.go

@@ -0,0 +1,20 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package predicate
+
+import (
+	"entgo.io/ent/dialect/sql"
+)
+
+// Group is the predicate function for group builders.
+type Group func(*sql.Selector)
+
+// Pet is the predicate function for pet builders.
+type Pet func(*sql.Selector)
+
+// User is the predicate function for user builders.
+type User func(*sql.Selector)

examples/traversal/ent/runtime.go

@@ -0,0 +1,13 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+// The init function reads all schema descriptors with runtime code
+// (default values, validators, hooks and policies) and stitches it
+// to their package variables.
+func init() {
+}

examples/traversal/ent/runtime/runtime.go

@@ -0,0 +1,13 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package runtime
+
+// The schema-stitching logic is generated in entgo.io/ent/examples/traversal/ent/runtime.go
+
+const (
+	Version = "v0.0.0-00010101000000-000000000000" // Version of ent codegen.
+)

examples/traversal/ent/schema/group.go

@@ -0,0 +1,32 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+package schema
+
+import (
+	"entgo.io/ent"
+	"entgo.io/ent/schema/edge"
+	"entgo.io/ent/schema/field"
+)
+
+// Group holds the schema definition for the Group entity.
+type Group struct {
+	ent.Schema
+}
+
+// Fields of the Group.
+func (Group) Fields() []ent.Field {
+	return []ent.Field{
+		field.String("name"),
+	}
+}
+
+// Edges of the Group.
+func (Group) Edges() []ent.Edge {
+	return []ent.Edge{
+		edge.To("users", User.Type),
+		edge.To("admin", User.Type).
+			Unique(),
+	}
+}

examples/traversal/ent/schema/pet.go

@@ -0,0 +1,33 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+package schema
+
+import (
+	"entgo.io/ent"
+	"entgo.io/ent/schema/edge"
+	"entgo.io/ent/schema/field"
+)
+
+// Pet holds the schema definition for the Pet entity.
+type Pet struct {
+	ent.Schema
+}
+
+// Fields of the Pet.
+func (Pet) Fields() []ent.Field {
+	return []ent.Field{
+		field.String("name"),
+	}
+}
+
+// Edges of the Pet.
+func (Pet) Edges() []ent.Edge {
+	return []ent.Edge{
+		edge.To("friends", Pet.Type),
+		edge.From("owner", User.Type).
+			Ref("pets").
+			Unique(),
+	}
+}

examples/traversal/ent/schema/user.go

@@ -0,0 +1,36 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+package schema
+
+import (
+	"entgo.io/ent"
+	"entgo.io/ent/schema/edge"
+	"entgo.io/ent/schema/field"
+)
+
+// User holds the schema definition for the User entity.
+type User struct {
+	ent.Schema
+}
+
+// Fields of the User.
+func (User) Fields() []ent.Field {
+	return []ent.Field{
+		field.Int("age"),
+		field.String("name"),
+	}
+}
+
+// Edges of the User.
+func (User) Edges() []ent.Edge {
+	return []ent.Edge{
+		edge.To("pets", Pet.Type),
+		edge.To("friends", User.Type),
+		edge.From("groups", Group.Type).
+			Ref("users"),
+		edge.From("manage", Group.Type).
+			Ref("admin"),
+	}
+}

examples/traversal/ent/tx.go

@@ -0,0 +1,220 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"sync"
+
+	"entgo.io/ent/dialect"
+)
+
+// Tx is a transactional client that is created by calling Client.Tx().
+type Tx struct {
+	config
+	// Group is the client for interacting with the Group builders.
+	Group *GroupClient
+	// Pet is the client for interacting with the Pet builders.
+	Pet *PetClient
+	// User is the client for interacting with the User builders.
+	User *UserClient
+
+	// lazily loaded.
+	client     *Client
+	clientOnce sync.Once
+	// ctx lives for the life of the transaction. It is
+	// the same context used by the underlying connection.
+	ctx context.Context
+}
+
+type (
+	// Committer is the interface that wraps the Commit method.
+	Committer interface {
+		Commit(context.Context, *Tx) error
+	}
+
+	// The CommitFunc type is an adapter to allow the use of ordinary
+	// function as a Committer. If f is a function with the appropriate
+	// signature, CommitFunc(f) is a Committer that calls f.
+	CommitFunc func(context.Context, *Tx) error
+
+	// CommitHook defines the "commit middleware". A function that gets a Committer
+	// and returns a Committer. For example:
+	//
+	//	hook := func(next ent.Committer) ent.Committer {
+	//		return ent.CommitFunc(func(ctx context.Context, tx *ent.Tx) error {
+	//			// Do some stuff before.
+	//			if err := next.Commit(ctx, tx); err != nil {
+	//				return err
+	//			}
+	//			// Do some stuff after.
+	//			return nil
+	//		})
+	//	}
+	//
+	CommitHook func(Committer) Committer
+)
+
+// Commit calls f(ctx, m).
+func (f CommitFunc) Commit(ctx context.Context, tx *Tx) error {
+	return f(ctx, tx)
+}
+
+// Commit commits the transaction.
+func (tx *Tx) Commit() error {
+	txDriver := tx.config.driver.(*txDriver)
+	var fn Committer = CommitFunc(func(context.Context, *Tx) error {
+		return txDriver.tx.Commit()
+	})
+	txDriver.mu.Lock()
+	hooks := append([]CommitHook(nil), txDriver.onCommit...)
+	txDriver.mu.Unlock()
+	for i := len(hooks) - 1; i >= 0; i-- {
+		fn = hooks[i](fn)
+	}
+	return fn.Commit(tx.ctx, tx)
+}
+
+// OnCommit adds a hook to call on commit.
+func (tx *Tx) OnCommit(f CommitHook) {
+	txDriver := tx.config.driver.(*txDriver)
+	txDriver.mu.Lock()
+	txDriver.onCommit = append(txDriver.onCommit, f)
+	txDriver.mu.Unlock()
+}
+
+type (
+	// Rollbacker is the interface that wraps the Rollback method.
+	Rollbacker interface {
+		Rollback(context.Context, *Tx) error
+	}
+
+	// The RollbackFunc type is an adapter to allow the use of ordinary
+	// function as a Rollbacker. If f is a function with the appropriate
+	// signature, RollbackFunc(f) is a Rollbacker that calls f.
+	RollbackFunc func(context.Context, *Tx) error
+
+	// RollbackHook defines the "rollback middleware". A function that gets a Rollbacker
+	// and returns a Rollbacker. For example:
+	//
+	//	hook := func(next ent.Rollbacker) ent.Rollbacker {
+	//		return ent.RollbackFunc(func(ctx context.Context, tx *ent.Tx) error {
+	//			// Do some stuff before.
+	//			if err := next.Rollback(ctx, tx); err != nil {
+	//				return err
+	//			}
+	//			// Do some stuff after.
+	//			return nil
+	//		})
+	//	}
+	//
+	RollbackHook func(Rollbacker) Rollbacker
+)
+
+// Rollback calls f(ctx, m).
+func (f RollbackFunc) Rollback(ctx context.Context, tx *Tx) error {
+	return f(ctx, tx)
+}
+
+// Rollback rollbacks the transaction.
+func (tx *Tx) Rollback() error {
+	txDriver := tx.config.driver.(*txDriver)
+	var fn Rollbacker = RollbackFunc(func(context.Context, *Tx) error {
+		return txDriver.tx.Rollback()
+	})
+	txDriver.mu.Lock()
+	hooks := append([]RollbackHook(nil), txDriver.onRollback...)
+	txDriver.mu.Unlock()
+	for i := len(hooks) - 1; i >= 0; i-- {
+		fn = hooks[i](fn)
+	}
+	return fn.Rollback(tx.ctx, tx)
+}
+
+// OnRollback adds a hook to call on rollback.
+func (tx *Tx) OnRollback(f RollbackHook) {
+	txDriver := tx.config.driver.(*txDriver)
+	txDriver.mu.Lock()
+	txDriver.onRollback = append(txDriver.onRollback, f)
+	txDriver.mu.Unlock()
+}
+
+// Client returns a Client that binds to current transaction.
+func (tx *Tx) Client() *Client {
+	tx.clientOnce.Do(func() {
+		tx.client = &Client{config: tx.config}
+		tx.client.init()
+	})
+	return tx.client
+}
+
+func (tx *Tx) init() {
+	tx.Group = NewGroupClient(tx.config)
+	tx.Pet = NewPetClient(tx.config)
+	tx.User = NewUserClient(tx.config)
+}
+
+// txDriver wraps the given dialect.Tx with a nop dialect.Driver implementation.
+// The idea is to support transactions without adding any extra code to the builders.
+// When a builder calls to driver.Tx(), it gets the same dialect.Tx instance.
+// Commit and Rollback are nop for the internal builders and the user must call one
+// of them in order to commit or rollback the transaction.
+//
+// If a closed transaction is embedded in one of the generated entities, and the entity
+// applies a query, for example: Group.QueryXXX(), the query will be executed
+// through the driver which created this transaction.
+//
+// Note that txDriver is not goroutine safe.
+type txDriver struct {
+	// the driver we started the transaction from.
+	drv dialect.Driver
+	// tx is the underlying transaction.
+	tx dialect.Tx
+	// completion hooks.
+	mu         sync.Mutex
+	onCommit   []CommitHook
+	onRollback []RollbackHook
+}
+
+// newTx creates a new transactional driver.
+func newTx(ctx context.Context, drv dialect.Driver) (*txDriver, error) {
+	tx, err := drv.Tx(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return &txDriver{tx: tx, drv: drv}, nil
+}
+
+// Tx returns the transaction wrapper (txDriver) to avoid Commit or Rollback calls
+// from the internal builders. Should be called only by the internal builders.
+func (tx *txDriver) Tx(context.Context) (dialect.Tx, error) { return tx, nil }
+
+// Dialect returns the dialect of the driver we started the transaction from.
+func (tx *txDriver) Dialect() string { return tx.drv.Dialect() }
+
+// Close is a nop close.
+func (*txDriver) Close() error { return nil }
+
+// Commit is a nop commit for the internal builders.
+// User must call `Tx.Commit` in order to commit the transaction.
+func (*txDriver) Commit() error { return nil }
+
+// Rollback is a nop rollback for the internal builders.
+// User must call `Tx.Rollback` in order to rollback the transaction.
+func (*txDriver) Rollback() error { return nil }
+
+// Exec calls tx.Exec.
+func (tx *txDriver) Exec(ctx context.Context, query string, args, v any) error {
+	return tx.tx.Exec(ctx, query, args, v)
+}
+
+// Query calls tx.Query.
+func (tx *txDriver) Query(ctx context.Context, query string, args, v any) error {
+	return tx.tx.Query(ctx, query, args, v)
+}
+
+var _ dialect.Driver = (*txDriver)(nil)

examples/traversal/ent/user.go

@@ -0,0 +1,192 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"fmt"
+	"strings"
+
+	"entgo.io/ent"
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/examples/traversal/ent/user"
+)
+
+// User is the model entity for the User schema.
+type User struct {
+	config `json:"-"`
+	// ID of the ent.
+	ID int `json:"id,omitempty"`
+	// Age holds the value of the "age" field.
+	Age int `json:"age,omitempty"`
+	// Name holds the value of the "name" field.
+	Name string `json:"name,omitempty"`
+	// Edges holds the relations/edges for other nodes in the graph.
+	// The values are being populated by the UserQuery when eager-loading is set.
+	Edges        UserEdges `json:"edges"`
+	selectValues sql.SelectValues
+}
+
+// UserEdges holds the relations/edges for other nodes in the graph.
+type UserEdges struct {
+	// Pets holds the value of the pets edge.
+	Pets []*Pet `json:"pets,omitempty"`
+	// Friends holds the value of the friends edge.
+	Friends []*User `json:"friends,omitempty"`
+	// Groups holds the value of the groups edge.
+	Groups []*Group `json:"groups,omitempty"`
+	// Manage holds the value of the manage edge.
+	Manage []*Group `json:"manage,omitempty"`
+	// loadedTypes holds the information for reporting if a
+	// type was loaded (or requested) in eager-loading or not.
+	loadedTypes [4]bool
+}
+
+// PetsOrErr returns the Pets value or an error if the edge
+// was not loaded in eager-loading.
+func (e UserEdges) PetsOrErr() ([]*Pet, error) {
+	if e.loadedTypes[0] {
+		return e.Pets, nil
+	}
+	return nil, &NotLoadedError{edge: "pets"}
+}
+
+// FriendsOrErr returns the Friends value or an error if the edge
+// was not loaded in eager-loading.
+func (e UserEdges) FriendsOrErr() ([]*User, error) {
+	if e.loadedTypes[1] {
+		return e.Friends, nil
+	}
+	return nil, &NotLoadedError{edge: "friends"}
+}
+
+// GroupsOrErr returns the Groups value or an error if the edge
+// was not loaded in eager-loading.
+func (e UserEdges) GroupsOrErr() ([]*Group, error) {
+	if e.loadedTypes[2] {
+		return e.Groups, nil
+	}
+	return nil, &NotLoadedError{edge: "groups"}
+}
+
+// ManageOrErr returns the Manage value or an error if the edge
+// was not loaded in eager-loading.
+func (e UserEdges) ManageOrErr() ([]*Group, error) {
+	if e.loadedTypes[3] {
+		return e.Manage, nil
+	}
+	return nil, &NotLoadedError{edge: "manage"}
+}
+
+// scanValues returns the types for scanning values from sql.Rows.
+func (*User) scanValues(columns []string) ([]any, error) {
+	values := make([]any, len(columns))
+	for i := range columns {
+		switch columns[i] {
+		case user.FieldID, user.FieldAge:
+			values[i] = new(sql.NullInt64)
+		case user.FieldName:
+			values[i] = new(sql.NullString)
+		default:
+			values[i] = new(sql.UnknownType)
+		}
+	}
+	return values, nil
+}
+
+// assignValues assigns the values that were returned from sql.Rows (after scanning)
+// to the User fields.
+func (_m *User) assignValues(columns []string, values []any) error {
+	if m, n := len(values), len(columns); m < n {
+		return fmt.Errorf("mismatch number of scan values: %d != %d", m, n)
+	}
+	for i := range columns {
+		switch columns[i] {
+		case user.FieldID:
+			value, ok := values[i].(*sql.NullInt64)
+			if !ok {
+				return fmt.Errorf("unexpected type %T for field id", value)
+			}
+			_m.ID = int(value.Int64)
+		case user.FieldAge:
+			if value, ok := values[i].(*sql.NullInt64); !ok {
+				return fmt.Errorf("unexpected type %T for field age", values[i])
+			} else if value.Valid {
+				_m.Age = int(value.Int64)
+			}
+		case user.FieldName:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field name", values[i])
+			} else if value.Valid {
+				_m.Name = value.String
+			}
+		default:
+			_m.selectValues.Set(columns[i], values[i])
+		}
+	}
+	return nil
+}
+
+// Value returns the ent.Value that was dynamically selected and assigned to the User.
+// This includes values selected through modifiers, order, etc.
+func (_m *User) Value(name string) (ent.Value, error) {
+	return _m.selectValues.Get(name)
+}
+
+// QueryPets queries the "pets" edge of the User entity.
+func (_m *User) QueryPets() *PetQuery {
+	return NewUserClient(_m.config).QueryPets(_m)
+}
+
+// QueryFriends queries the "friends" edge of the User entity.
+func (_m *User) QueryFriends() *UserQuery {
+	return NewUserClient(_m.config).QueryFriends(_m)
+}
+
+// QueryGroups queries the "groups" edge of the User entity.
+func (_m *User) QueryGroups() *GroupQuery {
+	return NewUserClient(_m.config).QueryGroups(_m)
+}
+
+// QueryManage queries the "manage" edge of the User entity.
+func (_m *User) QueryManage() *GroupQuery {
+	return NewUserClient(_m.config).QueryManage(_m)
+}
+
+// Update returns a builder for updating this User.
+// Note that you need to call User.Unwrap() before calling this method if this User
+// was returned from a transaction, and the transaction was committed or rolled back.
+func (_m *User) Update() *UserUpdateOne {
+	return NewUserClient(_m.config).UpdateOne(_m)
+}
+
+// Unwrap unwraps the User entity that was returned from a transaction after it was closed,
+// so that all future queries will be executed through the driver which created the transaction.
+func (_m *User) Unwrap() *User {
+	_tx, ok := _m.config.driver.(*txDriver)
+	if !ok {
+		panic("ent: User is not a transactional entity")
+	}
+	_m.config.driver = _tx.drv
+	return _m
+}
+
+// String implements the fmt.Stringer.
+func (_m *User) String() string {
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v, ", _m.ID))
+	builder.WriteString("age=")
+	builder.WriteString(fmt.Sprintf("%v", _m.Age))
+	builder.WriteString(", ")
+	builder.WriteString("name=")
+	builder.WriteString(_m.Name)
+	builder.WriteByte(')')
+	return builder.String()
+}
+
+// Users is a parsable slice of User.
+type Users []*User

examples/traversal/ent/user/mutation.go

@@ -0,0 +1,646 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package user
+
+import (
+	"context"
+	"fmt"
+
+	"entgo.io/ent"
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+)
+
+// Mutation represents an operation that mutates the User nodes in the graph.
+type Mutation struct {
+	op             ent.Op
+	typ            string
+	age            *int
+	addage         *int
+	name           *string
+	clearedFields  map[string]struct{}
+	pets           map[int]struct{}
+	removedpets    map[int]struct{}
+	clearedpets    bool
+	friends        map[int]struct{}
+	removedfriends map[int]struct{}
+	clearedfriends bool
+	groups         map[int]struct{}
+	removedgroups  map[int]struct{}
+	clearedgroups  bool
+	manage         map[int]struct{}
+	removedmanage  map[int]struct{}
+	clearedmanage  bool
+	predicates     []predicate.User
+}
+
+// NewMutation creates a new Mutation for the User entity.
+func NewMutation(op ent.Op) *Mutation {
+	return &Mutation{
+		op:            op,
+		typ:           "User",
+		clearedFields: make(map[string]struct{}),
+	}
+}
+
+// Predicates returns the list of predicates set on the mutation.
+func (m *Mutation) Predicates() []predicate.User {
+	return m.predicates
+}
+
+// SetAge sets the "age" field.
+func (m *Mutation) SetAge(i int) {
+	m.age = &i
+	m.addage = nil
+}
+
+// Age returns the value of the "age" field in the mutation.
+func (m *Mutation) Age() (r int, exists bool) {
+	v := m.age
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// AddAge adds i to the "age" field.
+func (m *Mutation) AddAge(i int) {
+	if m.addage != nil {
+		*m.addage += i
+	} else {
+		m.addage = &i
+	}
+}
+
+// AddedAge returns the value that was added to the "age" field in this mutation.
+func (m *Mutation) AddedAge() (r int, exists bool) {
+	v := m.addage
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// ResetAge resets all changes to the "age" field.
+func (m *Mutation) ResetAge() {
+	m.age = nil
+	m.addage = nil
+}
+
+// SetName sets the "name" field.
+func (m *Mutation) SetName(s string) {
+	m.name = &s
+}
+
+// Name returns the value of the "name" field in the mutation.
+func (m *Mutation) Name() (r string, exists bool) {
+	v := m.name
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// ResetName resets all changes to the "name" field.
+func (m *Mutation) ResetName() {
+	m.name = nil
+}
+
+// AddPetIDs adds the "pets" edge to the Pet entity by ids.
+func (m *Mutation) AddPetIDs(ids ...int) {
+	if m.pets == nil {
+		m.pets = make(map[int]struct{})
+	}
+	for i := range ids {
+		m.pets[ids[i]] = struct{}{}
+	}
+}
+
+// ClearPets clears the "pets" edge to the Pet entity.
+func (m *Mutation) ClearPets() {
+	m.clearedpets = true
+}
+
+// PetsCleared reports if the "pets" edge to the Pet entity was cleared.
+func (m *Mutation) PetsCleared() bool {
+	return m.clearedpets
+}
+
+// RemovePetIDs removes the "pets" edge to the Pet entity by IDs.
+func (m *Mutation) RemovePetIDs(ids ...int) {
+	if m.removedpets == nil {
+		m.removedpets = make(map[int]struct{})
+	}
+	for i := range ids {
+		delete(m.pets, ids[i])
+		m.removedpets[ids[i]] = struct{}{}
+	}
+}
+
+// RemovedPets returns the removed IDs of the "pets" edge to the Pet entity.
+func (m *Mutation) RemovedPetsIDs() (ids []int) {
+	for id := range m.removedpets {
+		ids = append(ids, id)
+	}
+	return
+}
+
+// PetsIDs returns the "pets" edge IDs in the mutation.
+func (m *Mutation) PetsIDs() (ids []int) {
+	for id := range m.pets {
+		ids = append(ids, id)
+	}
+	return
+}
+
+// ResetPets resets all changes to the "pets" edge.
+func (m *Mutation) ResetPets() {
+	m.pets = nil
+	m.clearedpets = false
+	m.removedpets = nil
+}
+
+// AddFriendIDs adds the "friends" edge to the User entity by ids.
+func (m *Mutation) AddFriendIDs(ids ...int) {
+	if m.friends == nil {
+		m.friends = make(map[int]struct{})
+	}
+	for i := range ids {
+		m.friends[ids[i]] = struct{}{}
+	}
+}
+
+// ClearFriends clears the "friends" edge to the User entity.
+func (m *Mutation) ClearFriends() {
+	m.clearedfriends = true
+}
+
+// FriendsCleared reports if the "friends" edge to the User entity was cleared.
+func (m *Mutation) FriendsCleared() bool {
+	return m.clearedfriends
+}
+
+// RemoveFriendIDs removes the "friends" edge to the User entity by IDs.
+func (m *Mutation) RemoveFriendIDs(ids ...int) {
+	if m.removedfriends == nil {
+		m.removedfriends = make(map[int]struct{})
+	}
+	for i := range ids {
+		delete(m.friends, ids[i])
+		m.removedfriends[ids[i]] = struct{}{}
+	}
+}
+
+// RemovedFriends returns the removed IDs of the "friends" edge to the User entity.
+func (m *Mutation) RemovedFriendsIDs() (ids []int) {
+	for id := range m.removedfriends {
+		ids = append(ids, id)
+	}
+	return
+}
+
+// FriendsIDs returns the "friends" edge IDs in the mutation.
+func (m *Mutation) FriendsIDs() (ids []int) {
+	for id := range m.friends {
+		ids = append(ids, id)
+	}
+	return
+}
+
+// ResetFriends resets all changes to the "friends" edge.
+func (m *Mutation) ResetFriends() {
+	m.friends = nil
+	m.clearedfriends = false
+	m.removedfriends = nil
+}
+
+// AddGroupIDs adds the "groups" edge to the Group entity by ids.
+func (m *Mutation) AddGroupIDs(ids ...int) {
+	if m.groups == nil {
+		m.groups = make(map[int]struct{})
+	}
+	for i := range ids {
+		m.groups[ids[i]] = struct{}{}
+	}
+}
+
+// ClearGroups clears the "groups" edge to the Group entity.
+func (m *Mutation) ClearGroups() {
+	m.clearedgroups = true
+}
+
+// GroupsCleared reports if the "groups" edge to the Group entity was cleared.
+func (m *Mutation) GroupsCleared() bool {
+	return m.clearedgroups
+}
+
+// RemoveGroupIDs removes the "groups" edge to the Group entity by IDs.
+func (m *Mutation) RemoveGroupIDs(ids ...int) {
+	if m.removedgroups == nil {
+		m.removedgroups = make(map[int]struct{})
+	}
+	for i := range ids {
+		delete(m.groups, ids[i])
+		m.removedgroups[ids[i]] = struct{}{}
+	}
+}
+
+// RemovedGroups returns the removed IDs of the "groups" edge to the Group entity.
+func (m *Mutation) RemovedGroupsIDs() (ids []int) {
+	for id := range m.removedgroups {
+		ids = append(ids, id)
+	}
+	return
+}
+
+// GroupsIDs returns the "groups" edge IDs in the mutation.
+func (m *Mutation) GroupsIDs() (ids []int) {
+	for id := range m.groups {
+		ids = append(ids, id)
+	}
+	return
+}
+
+// ResetGroups resets all changes to the "groups" edge.
+func (m *Mutation) ResetGroups() {
+	m.groups = nil
+	m.clearedgroups = false
+	m.removedgroups = nil
+}
+
+// AddManageIDs adds the "manage" edge to the Group entity by ids.
+func (m *Mutation) AddManageIDs(ids ...int) {
+	if m.manage == nil {
+		m.manage = make(map[int]struct{})
+	}
+	for i := range ids {
+		m.manage[ids[i]] = struct{}{}
+	}
+}
+
+// ClearManage clears the "manage" edge to the Group entity.
+func (m *Mutation) ClearManage() {
+	m.clearedmanage = true
+}
+
+// ManageCleared reports if the "manage" edge to the Group entity was cleared.
+func (m *Mutation) ManageCleared() bool {
+	return m.clearedmanage
+}
+
+// RemoveManageIDs removes the "manage" edge to the Group entity by IDs.
+func (m *Mutation) RemoveManageIDs(ids ...int) {
+	if m.removedmanage == nil {
+		m.removedmanage = make(map[int]struct{})
+	}
+	for i := range ids {
+		delete(m.manage, ids[i])
+		m.removedmanage[ids[i]] = struct{}{}
+	}
+}
+
+// RemovedManage returns the removed IDs of the "manage" edge to the Group entity.
+func (m *Mutation) RemovedManageIDs() (ids []int) {
+	for id := range m.removedmanage {
+		ids = append(ids, id)
+	}
+	return
+}
+
+// ManageIDs returns the "manage" edge IDs in the mutation.
+func (m *Mutation) ManageIDs() (ids []int) {
+	for id := range m.manage {
+		ids = append(ids, id)
+	}
+	return
+}
+
+// ResetManage resets all changes to the "manage" edge.
+func (m *Mutation) ResetManage() {
+	m.manage = nil
+	m.clearedmanage = false
+	m.removedmanage = nil
+}
+
+// Where appends a list predicates to the Mutation builder.
+func (m *Mutation) Where(ps ...predicate.User) {
+	m.predicates = append(m.predicates, ps...)
+}
+
+// WhereP appends storage-level predicates to the Mutation builder. Using this method,
+// users can use type-assertion to append predicates that do not depend on any generated package.
+func (m *Mutation) WhereP(ps ...func(*sql.Selector)) {
+	p := make([]predicate.User, len(ps))
+	for i := range ps {
+		p[i] = ps[i]
+	}
+	m.Where(p...)
+}
+
+// Op returns the operation name.
+func (m *Mutation) Op() ent.Op {
+	return m.op
+}
+
+// SetOp allows setting the mutation operation.
+func (m *Mutation) SetOp(op ent.Op) {
+	m.op = op
+}
+
+// Type returns the node type of this mutation (User).
+func (m *Mutation) Type() string {
+	return m.typ
+}
+
+// Fields returns all fields that were changed during this mutation. Note that in
+// order to get all numeric fields that were incremented/decremented, call
+// AddedFields().
+func (m *Mutation) Fields() []string {
+	fields := make([]string, 0, 2)
+	if m.age != nil {
+		fields = append(fields, FieldAge)
+	}
+	if m.name != nil {
+		fields = append(fields, FieldName)
+	}
+	return fields
+}
+
+// Field returns the value of a field with the given name. The second boolean
+// return value indicates that this field was not set, or was not defined in the
+// schema.
+func (m *Mutation) Field(name string) (ent.Value, bool) {
+	switch name {
+	case FieldAge:
+		return m.Age()
+	case FieldName:
+		return m.Name()
+	}
+	return nil, false
+}
+
+// OldField returns the old value of the field from the database. An error is
+// returned if the mutation operation is not UpdateOne, or the query to the
+// database failed.
+func (m *Mutation) OldField(ctx context.Context, name string) (ent.Value, error) {
+	return nil, fmt.Errorf("unknown User field %s", name)
+}
+
+// SetField sets the value of a field with the given name. It returns an error if
+// the field is not defined in the schema, or if the type mismatched the field
+// type.
+func (m *Mutation) SetField(name string, value ent.Value) error {
+	switch name {
+	case FieldAge:
+		v, ok := value.(int)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.SetAge(v)
+		return nil
+	case FieldName:
+		v, ok := value.(string)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.SetName(v)
+		return nil
+	}
+	return fmt.Errorf("unknown User field %s", name)
+}
+
+// AddedFields returns all numeric fields that were incremented/decremented during
+// this mutation.
+func (m *Mutation) AddedFields() []string {
+	var fields []string
+	if m.addage != nil {
+		fields = append(fields, FieldAge)
+	}
+	return fields
+}
+
+// AddedField returns the numeric value that was incremented/decremented on a field
+// with the given name. The second boolean return value indicates that this field
+// was not set, or was not defined in the schema.
+func (m *Mutation) AddedField(name string) (ent.Value, bool) {
+	switch name {
+	case FieldAge:
+		return m.AddedAge()
+	}
+	return nil, false
+}
+
+// AddField adds the value to the field with the given name. It returns an error if
+// the field is not defined in the schema, or if the type mismatched the field
+// type.
+func (m *Mutation) AddField(name string, value ent.Value) error {
+	switch name {
+	case FieldAge:
+		v, ok := value.(int)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.AddAge(v)
+		return nil
+	}
+	return fmt.Errorf("unknown User numeric field %s", name)
+}
+
+// ClearedFields returns all nullable fields that were cleared during this
+// mutation.
+func (m *Mutation) ClearedFields() []string {
+	return nil
+}
+
+// FieldCleared returns a boolean indicating if a field with the given name was
+// cleared in this mutation.
+func (m *Mutation) FieldCleared(name string) bool {
+	_, ok := m.clearedFields[name]
+	return ok
+}
+
+// ClearField clears the value of the field with the given name. It returns an
+// error if the field is not defined in the schema.
+func (m *Mutation) ClearField(name string) error {
+	return fmt.Errorf("unknown User nullable field %s", name)
+}
+
+// ResetField resets all changes in the mutation for the field with the given name.
+// It returns an error if the field is not defined in the schema.
+func (m *Mutation) ResetField(name string) error {
+	switch name {
+	case FieldAge:
+		m.ResetAge()
+		return nil
+	case FieldName:
+		m.ResetName()
+		return nil
+	}
+	return fmt.Errorf("unknown User field %s", name)
+}
+
+// AddedEdges returns all edge names that were set/added in this mutation.
+func (m *Mutation) AddedEdges() []string {
+	edges := make([]string, 0, 4)
+	if m.pets != nil {
+		edges = append(edges, EdgePets)
+	}
+	if m.friends != nil {
+		edges = append(edges, EdgeFriends)
+	}
+	if m.groups != nil {
+		edges = append(edges, EdgeGroups)
+	}
+	if m.manage != nil {
+		edges = append(edges, EdgeManage)
+	}
+	return edges
+}
+
+// AddedIDs returns all IDs (to other nodes) that were added for the given edge
+// name in this mutation.
+func (m *Mutation) AddedIDs(name string) []ent.Value {
+	switch name {
+	case EdgePets:
+		ids := make([]ent.Value, 0, len(m.pets))
+		for id := range m.pets {
+			ids = append(ids, id)
+		}
+		return ids
+	case EdgeFriends:
+		ids := make([]ent.Value, 0, len(m.friends))
+		for id := range m.friends {
+			ids = append(ids, id)
+		}
+		return ids
+	case EdgeGroups:
+		ids := make([]ent.Value, 0, len(m.groups))
+		for id := range m.groups {
+			ids = append(ids, id)
+		}
+		return ids
+	case EdgeManage:
+		ids := make([]ent.Value, 0, len(m.manage))
+		for id := range m.manage {
+			ids = append(ids, id)
+		}
+		return ids
+	}
+	return nil
+}
+
+// RemovedEdges returns all edge names that were removed in this mutation.
+func (m *Mutation) RemovedEdges() []string {
+	edges := make([]string, 0, 4)
+	if m.removedpets != nil {
+		edges = append(edges, EdgePets)
+	}
+	if m.removedfriends != nil {
+		edges = append(edges, EdgeFriends)
+	}
+	if m.removedgroups != nil {
+		edges = append(edges, EdgeGroups)
+	}
+	if m.removedmanage != nil {
+		edges = append(edges, EdgeManage)
+	}
+	return edges
+}
+
+// RemovedIDs returns all IDs (to other nodes) that were removed for the edge with
+// the given name in this mutation.
+func (m *Mutation) RemovedIDs(name string) []ent.Value {
+	switch name {
+	case EdgePets:
+		ids := make([]ent.Value, 0, len(m.removedpets))
+		for id := range m.removedpets {
+			ids = append(ids, id)
+		}
+		return ids
+	case EdgeFriends:
+		ids := make([]ent.Value, 0, len(m.removedfriends))
+		for id := range m.removedfriends {
+			ids = append(ids, id)
+		}
+		return ids
+	case EdgeGroups:
+		ids := make([]ent.Value, 0, len(m.removedgroups))
+		for id := range m.removedgroups {
+			ids = append(ids, id)
+		}
+		return ids
+	case EdgeManage:
+		ids := make([]ent.Value, 0, len(m.removedmanage))
+		for id := range m.removedmanage {
+			ids = append(ids, id)
+		}
+		return ids
+	}
+	return nil
+}
+
+// ClearedEdges returns all edge names that were cleared in this mutation.
+func (m *Mutation) ClearedEdges() []string {
+	edges := make([]string, 0, 4)
+	if m.clearedpets {
+		edges = append(edges, EdgePets)
+	}
+	if m.clearedfriends {
+		edges = append(edges, EdgeFriends)
+	}
+	if m.clearedgroups {
+		edges = append(edges, EdgeGroups)
+	}
+	if m.clearedmanage {
+		edges = append(edges, EdgeManage)
+	}
+	return edges
+}
+
+// EdgeCleared returns a boolean which indicates if the edge with the given name
+// was cleared in this mutation.
+func (m *Mutation) EdgeCleared(name string) bool {
+	switch name {
+	case EdgePets:
+		return m.clearedpets
+	case EdgeFriends:
+		return m.clearedfriends
+	case EdgeGroups:
+		return m.clearedgroups
+	case EdgeManage:
+		return m.clearedmanage
+	}
+	return false
+}
+
+// ClearEdge clears the value of the edge with the given name. It returns an error
+// if that edge is not defined in the schema.
+func (m *Mutation) ClearEdge(name string) error {
+	switch name {
+	}
+	return fmt.Errorf("unknown User unique edge %s", name)
+}
+
+// ResetEdge resets all changes to the edge with the given name in this mutation.
+// It returns an error if the edge is not defined in the schema.
+func (m *Mutation) ResetEdge(name string) error {
+	switch name {
+	case EdgePets:
+		m.ResetPets()
+		return nil
+	case EdgeFriends:
+		m.ResetFriends()
+		return nil
+	case EdgeGroups:
+		m.ResetGroups()
+		return nil
+	case EdgeManage:
+		m.ResetManage()
+		return nil
+	}
+	return fmt.Errorf("unknown User edge %s", name)
+}

examples/traversal/ent/user/user.go

@@ -0,0 +1,182 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package user
+
+import (
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+)
+
+const (
+	// Label holds the string label denoting the user type in the database.
+	Label = "user"
+	// FieldID holds the string denoting the id field in the database.
+	FieldID = "id"
+	// FieldAge holds the string denoting the age field in the database.
+	FieldAge = "age"
+	// FieldName holds the string denoting the name field in the database.
+	FieldName = "name"
+	// EdgePets holds the string denoting the pets edge name in mutations.
+	EdgePets = "pets"
+	// EdgeFriends holds the string denoting the friends edge name in mutations.
+	EdgeFriends = "friends"
+	// EdgeGroups holds the string denoting the groups edge name in mutations.
+	EdgeGroups = "groups"
+	// EdgeManage holds the string denoting the manage edge name in mutations.
+	EdgeManage = "manage"
+	// Table holds the table name of the user in the database.
+	Table = "users"
+	// PetsTable is the table that holds the pets relation/edge.
+	PetsTable = "pets"
+	// PetsInverseTable is the table name for the Pet entity.
+	// It exists in this package in order to avoid circular dependency with the "pet" package.
+	PetsInverseTable = "pets"
+	// PetsColumn is the table column denoting the pets relation/edge.
+	PetsColumn = "user_pets"
+	// FriendsTable is the table that holds the friends relation/edge. The primary key declared below.
+	FriendsTable = "user_friends"
+	// GroupsTable is the table that holds the groups relation/edge. The primary key declared below.
+	GroupsTable = "group_users"
+	// GroupsInverseTable is the table name for the Group entity.
+	// It exists in this package in order to avoid circular dependency with the "group" package.
+	GroupsInverseTable = "groups"
+	// ManageTable is the table that holds the manage relation/edge.
+	ManageTable = "groups"
+	// ManageInverseTable is the table name for the Group entity.
+	// It exists in this package in order to avoid circular dependency with the "group" package.
+	ManageInverseTable = "groups"
+	// ManageColumn is the table column denoting the manage relation/edge.
+	ManageColumn = "group_admin"
+)
+
+// Columns holds all SQL columns for user fields.
+var Columns = []string{
+	FieldID,
+	FieldAge,
+	FieldName,
+}
+
+var (
+	// FriendsPrimaryKey and FriendsColumn2 are the table columns denoting the
+	// primary key for the friends relation (M2M).
+	FriendsPrimaryKey = []string{"user_id", "friend_id"}
+	// GroupsPrimaryKey and GroupsColumn2 are the table columns denoting the
+	// primary key for the groups relation (M2M).
+	GroupsPrimaryKey = []string{"group_id", "user_id"}
+)
+
+// ValidColumn reports if the column name is valid (part of the table columns).
+func ValidColumn(column string) bool {
+	for i := range Columns {
+		if column == Columns[i] {
+			return true
+		}
+	}
+	return false
+}
+
+// OrderOption defines the ordering options for the User queries.
+type OrderOption func(*sql.Selector)
+
+// ByID orders the results by the id field.
+func ByID(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldID, opts...).ToFunc()
+}
+
+// ByAge orders the results by the age field.
+func ByAge(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldAge, opts...).ToFunc()
+}
+
+// ByName orders the results by the name field.
+func ByName(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldName, opts...).ToFunc()
+}
+
+// ByPetsCount orders the results by pets count.
+func ByPetsCount(opts ...sql.OrderTermOption) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborsCount(s, newPetsStep(), opts...)
+	}
+}
+
+// ByPets orders the results by pets terms.
+func ByPets(term sql.OrderTerm, terms ...sql.OrderTerm) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborTerms(s, newPetsStep(), append([]sql.OrderTerm{term}, terms...)...)
+	}
+}
+
+// ByFriendsCount orders the results by friends count.
+func ByFriendsCount(opts ...sql.OrderTermOption) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborsCount(s, newFriendsStep(), opts...)
+	}
+}
+
+// ByFriends orders the results by friends terms.
+func ByFriends(term sql.OrderTerm, terms ...sql.OrderTerm) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborTerms(s, newFriendsStep(), append([]sql.OrderTerm{term}, terms...)...)
+	}
+}
+
+// ByGroupsCount orders the results by groups count.
+func ByGroupsCount(opts ...sql.OrderTermOption) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborsCount(s, newGroupsStep(), opts...)
+	}
+}
+
+// ByGroups orders the results by groups terms.
+func ByGroups(term sql.OrderTerm, terms ...sql.OrderTerm) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborTerms(s, newGroupsStep(), append([]sql.OrderTerm{term}, terms...)...)
+	}
+}
+
+// ByManageCount orders the results by manage count.
+func ByManageCount(opts ...sql.OrderTermOption) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborsCount(s, newManageStep(), opts...)
+	}
+}
+
+// ByManage orders the results by manage terms.
+func ByManage(term sql.OrderTerm, terms ...sql.OrderTerm) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborTerms(s, newManageStep(), append([]sql.OrderTerm{term}, terms...)...)
+	}
+}
+func newPetsStep() *sqlgraph.Step {
+	return sqlgraph.NewStep(
+		sqlgraph.From(Table, FieldID),
+		sqlgraph.To(PetsInverseTable, FieldID),
+		sqlgraph.Edge(sqlgraph.O2M, false, PetsTable, PetsColumn),
+	)
+}
+func newFriendsStep() *sqlgraph.Step {
+	return sqlgraph.NewStep(
+		sqlgraph.From(Table, FieldID),
+		sqlgraph.To(Table, FieldID),
+		sqlgraph.Edge(sqlgraph.M2M, false, FriendsTable, FriendsPrimaryKey...),
+	)
+}
+func newGroupsStep() *sqlgraph.Step {
+	return sqlgraph.NewStep(
+		sqlgraph.From(Table, FieldID),
+		sqlgraph.To(GroupsInverseTable, FieldID),
+		sqlgraph.Edge(sqlgraph.M2M, true, GroupsTable, GroupsPrimaryKey...),
+	)
+}
+func newManageStep() *sqlgraph.Step {
+	return sqlgraph.NewStep(
+		sqlgraph.From(Table, FieldID),
+		sqlgraph.To(ManageInverseTable, FieldID),
+		sqlgraph.Edge(sqlgraph.O2M, true, ManageTable, ManageColumn),
+	)
+}

examples/traversal/ent/user/where.go

@@ -0,0 +1,280 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package user
+
+import (
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+)
+
+// ID filters vertices based on their ID field.
+func ID(id int) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldID, id))
+}
+
+// IDEQ applies the EQ predicate on the ID field.
+func IDEQ(id int) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldID, id))
+}
+
+// IDNEQ applies the NEQ predicate on the ID field.
+func IDNEQ(id int) predicate.User {
+	return predicate.User(sql.FieldNEQ(FieldID, id))
+}
+
+// IDIn applies the In predicate on the ID field.
+func IDIn(ids ...int) predicate.User {
+	return predicate.User(sql.FieldIn(FieldID, ids...))
+}
+
+// IDNotIn applies the NotIn predicate on the ID field.
+func IDNotIn(ids ...int) predicate.User {
+	return predicate.User(sql.FieldNotIn(FieldID, ids...))
+}
+
+// IDGT applies the GT predicate on the ID field.
+func IDGT(id int) predicate.User {
+	return predicate.User(sql.FieldGT(FieldID, id))
+}
+
+// IDGTE applies the GTE predicate on the ID field.
+func IDGTE(id int) predicate.User {
+	return predicate.User(sql.FieldGTE(FieldID, id))
+}
+
+// IDLT applies the LT predicate on the ID field.
+func IDLT(id int) predicate.User {
+	return predicate.User(sql.FieldLT(FieldID, id))
+}
+
+// IDLTE applies the LTE predicate on the ID field.
+func IDLTE(id int) predicate.User {
+	return predicate.User(sql.FieldLTE(FieldID, id))
+}
+
+// Age applies equality check predicate on the "age" field. It's identical to AgeEQ.
+func Age(v int) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldAge, v))
+}
+
+// Name applies equality check predicate on the "name" field. It's identical to NameEQ.
+func Name(v string) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldName, v))
+}
+
+// AgeEQ applies the EQ predicate on the "age" field.
+func AgeEQ(v int) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldAge, v))
+}
+
+// AgeNEQ applies the NEQ predicate on the "age" field.
+func AgeNEQ(v int) predicate.User {
+	return predicate.User(sql.FieldNEQ(FieldAge, v))
+}
+
+// AgeIn applies the In predicate on the "age" field.
+func AgeIn(vs ...int) predicate.User {
+	return predicate.User(sql.FieldIn(FieldAge, vs...))
+}
+
+// AgeNotIn applies the NotIn predicate on the "age" field.
+func AgeNotIn(vs ...int) predicate.User {
+	return predicate.User(sql.FieldNotIn(FieldAge, vs...))
+}
+
+// AgeGT applies the GT predicate on the "age" field.
+func AgeGT(v int) predicate.User {
+	return predicate.User(sql.FieldGT(FieldAge, v))
+}
+
+// AgeGTE applies the GTE predicate on the "age" field.
+func AgeGTE(v int) predicate.User {
+	return predicate.User(sql.FieldGTE(FieldAge, v))
+}
+
+// AgeLT applies the LT predicate on the "age" field.
+func AgeLT(v int) predicate.User {
+	return predicate.User(sql.FieldLT(FieldAge, v))
+}
+
+// AgeLTE applies the LTE predicate on the "age" field.
+func AgeLTE(v int) predicate.User {
+	return predicate.User(sql.FieldLTE(FieldAge, v))
+}
+
+// NameEQ applies the EQ predicate on the "name" field.
+func NameEQ(v string) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldName, v))
+}
+
+// NameNEQ applies the NEQ predicate on the "name" field.
+func NameNEQ(v string) predicate.User {
+	return predicate.User(sql.FieldNEQ(FieldName, v))
+}
+
+// NameIn applies the In predicate on the "name" field.
+func NameIn(vs ...string) predicate.User {
+	return predicate.User(sql.FieldIn(FieldName, vs...))
+}
+
+// NameNotIn applies the NotIn predicate on the "name" field.
+func NameNotIn(vs ...string) predicate.User {
+	return predicate.User(sql.FieldNotIn(FieldName, vs...))
+}
+
+// NameGT applies the GT predicate on the "name" field.
+func NameGT(v string) predicate.User {
+	return predicate.User(sql.FieldGT(FieldName, v))
+}
+
+// NameGTE applies the GTE predicate on the "name" field.
+func NameGTE(v string) predicate.User {
+	return predicate.User(sql.FieldGTE(FieldName, v))
+}
+
+// NameLT applies the LT predicate on the "name" field.
+func NameLT(v string) predicate.User {
+	return predicate.User(sql.FieldLT(FieldName, v))
+}
+
+// NameLTE applies the LTE predicate on the "name" field.
+func NameLTE(v string) predicate.User {
+	return predicate.User(sql.FieldLTE(FieldName, v))
+}
+
+// NameContains applies the Contains predicate on the "name" field.
+func NameContains(v string) predicate.User {
+	return predicate.User(sql.FieldContains(FieldName, v))
+}
+
+// NameHasPrefix applies the HasPrefix predicate on the "name" field.
+func NameHasPrefix(v string) predicate.User {
+	return predicate.User(sql.FieldHasPrefix(FieldName, v))
+}
+
+// NameHasSuffix applies the HasSuffix predicate on the "name" field.
+func NameHasSuffix(v string) predicate.User {
+	return predicate.User(sql.FieldHasSuffix(FieldName, v))
+}
+
+// NameEqualFold applies the EqualFold predicate on the "name" field.
+func NameEqualFold(v string) predicate.User {
+	return predicate.User(sql.FieldEqualFold(FieldName, v))
+}
+
+// NameContainsFold applies the ContainsFold predicate on the "name" field.
+func NameContainsFold(v string) predicate.User {
+	return predicate.User(sql.FieldContainsFold(FieldName, v))
+}
+
+// HasPets applies the HasEdge predicate on the "pets" edge.
+func HasPets() predicate.User {
+	return predicate.User(func(s *sql.Selector) {
+		step := sqlgraph.NewStep(
+			sqlgraph.From(Table, FieldID),
+			sqlgraph.Edge(sqlgraph.O2M, false, PetsTable, PetsColumn),
+		)
+		sqlgraph.HasNeighbors(s, step)
+	})
+}
+
+// HasPetsWith applies the HasEdge predicate on the "pets" edge with a given conditions (other predicates).
+func HasPetsWith(preds ...predicate.Pet) predicate.User {
+	return predicate.User(func(s *sql.Selector) {
+		step := newPetsStep()
+		sqlgraph.HasNeighborsWith(s, step, func(s *sql.Selector) {
+			for _, p := range preds {
+				p(s)
+			}
+		})
+	})
+}
+
+// HasFriends applies the HasEdge predicate on the "friends" edge.
+func HasFriends() predicate.User {
+	return predicate.User(func(s *sql.Selector) {
+		step := sqlgraph.NewStep(
+			sqlgraph.From(Table, FieldID),
+			sqlgraph.Edge(sqlgraph.M2M, false, FriendsTable, FriendsPrimaryKey...),
+		)
+		sqlgraph.HasNeighbors(s, step)
+	})
+}
+
+// HasFriendsWith applies the HasEdge predicate on the "friends" edge with a given conditions (other predicates).
+func HasFriendsWith(preds ...predicate.User) predicate.User {
+	return predicate.User(func(s *sql.Selector) {
+		step := newFriendsStep()
+		sqlgraph.HasNeighborsWith(s, step, func(s *sql.Selector) {
+			for _, p := range preds {
+				p(s)
+			}
+		})
+	})
+}
+
+// HasGroups applies the HasEdge predicate on the "groups" edge.
+func HasGroups() predicate.User {
+	return predicate.User(func(s *sql.Selector) {
+		step := sqlgraph.NewStep(
+			sqlgraph.From(Table, FieldID),
+			sqlgraph.Edge(sqlgraph.M2M, true, GroupsTable, GroupsPrimaryKey...),
+		)
+		sqlgraph.HasNeighbors(s, step)
+	})
+}
+
+// HasGroupsWith applies the HasEdge predicate on the "groups" edge with a given conditions (other predicates).
+func HasGroupsWith(preds ...predicate.Group) predicate.User {
+	return predicate.User(func(s *sql.Selector) {
+		step := newGroupsStep()
+		sqlgraph.HasNeighborsWith(s, step, func(s *sql.Selector) {
+			for _, p := range preds {
+				p(s)
+			}
+		})
+	})
+}
+
+// HasManage applies the HasEdge predicate on the "manage" edge.
+func HasManage() predicate.User {
+	return predicate.User(func(s *sql.Selector) {
+		step := sqlgraph.NewStep(
+			sqlgraph.From(Table, FieldID),
+			sqlgraph.Edge(sqlgraph.O2M, true, ManageTable, ManageColumn),
+		)
+		sqlgraph.HasNeighbors(s, step)
+	})
+}
+
+// HasManageWith applies the HasEdge predicate on the "manage" edge with a given conditions (other predicates).
+func HasManageWith(preds ...predicate.Group) predicate.User {
+	return predicate.User(func(s *sql.Selector) {
+		step := newManageStep()
+		sqlgraph.HasNeighborsWith(s, step, func(s *sql.Selector) {
+			for _, p := range preds {
+				p(s)
+			}
+		})
+	})
+}
+
+// And groups predicates with the AND operator between them.
+func And(predicates ...predicate.User) predicate.User {
+	return predicate.User(sql.AndPredicates(predicates...))
+}
+
+// Or groups predicates with the OR operator between them.
+func Or(predicates ...predicate.User) predicate.User {
+	return predicate.User(sql.OrPredicates(predicates...))
+}
+
+// Not applies the not operator on the given predicate.
+func Not(p predicate.User) predicate.User {
+	return predicate.User(sql.NotPredicates(p))
+}

examples/traversal/ent/user_create.go

@@ -0,0 +1,326 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/group"
+	"entgo.io/ent/examples/traversal/ent/pet"
+	"entgo.io/ent/examples/traversal/ent/user"
+	"entgo.io/ent/schema/field"
+)
+
+// UserCreate is the builder for creating a User entity.
+type UserCreate struct {
+	config
+	mutation *UserMutation
+	hooks    []Hook
+}
+
+// SetAge sets the "age" field.
+func (_c *UserCreate) SetAge(v int) *UserCreate {
+	_c.mutation.SetAge(v)
+	return _c
+}
+
+// SetName sets the "name" field.
+func (_c *UserCreate) SetName(v string) *UserCreate {
+	_c.mutation.SetName(v)
+	return _c
+}
+
+// AddPetIDs adds the "pets" edge to the Pet entity by IDs.
+func (_c *UserCreate) AddPetIDs(ids ...int) *UserCreate {
+	_c.mutation.AddPetIDs(ids...)
+	return _c
+}
+
+// AddPets adds the "pets" edges to the Pet entity.
+func (_c *UserCreate) AddPets(v ...*Pet) *UserCreate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _c.AddPetIDs(ids...)
+}
+
+// AddFriendIDs adds the "friends" edge to the User entity by IDs.
+func (_c *UserCreate) AddFriendIDs(ids ...int) *UserCreate {
+	_c.mutation.AddFriendIDs(ids...)
+	return _c
+}
+
+// AddFriends adds the "friends" edges to the User entity.
+func (_c *UserCreate) AddFriends(v ...*User) *UserCreate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _c.AddFriendIDs(ids...)
+}
+
+// AddGroupIDs adds the "groups" edge to the Group entity by IDs.
+func (_c *UserCreate) AddGroupIDs(ids ...int) *UserCreate {
+	_c.mutation.AddGroupIDs(ids...)
+	return _c
+}
+
+// AddGroups adds the "groups" edges to the Group entity.
+func (_c *UserCreate) AddGroups(v ...*Group) *UserCreate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _c.AddGroupIDs(ids...)
+}
+
+// AddManageIDs adds the "manage" edge to the Group entity by IDs.
+func (_c *UserCreate) AddManageIDs(ids ...int) *UserCreate {
+	_c.mutation.AddManageIDs(ids...)
+	return _c
+}
+
+// AddManage adds the "manage" edges to the Group entity.
+func (_c *UserCreate) AddManage(v ...*Group) *UserCreate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _c.AddManageIDs(ids...)
+}
+
+// Mutation returns the UserMutation object of the builder.
+func (_c *UserCreate) Mutation() *UserMutation {
+	return _c.mutation
+}
+
+// Save creates the User in the database.
+func (_c *UserCreate) Save(ctx context.Context) (*User, error) {
+	return withHooks(ctx, _c.sqlSave, _c.mutation, _c.hooks)
+}
+
+// SaveX calls Save and panics if Save returns an error.
+func (_c *UserCreate) SaveX(ctx context.Context) *User {
+	v, err := _c.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Exec executes the query.
+func (_c *UserCreate) Exec(ctx context.Context) error {
+	_, err := _c.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_c *UserCreate) ExecX(ctx context.Context) {
+	if err := _c.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
+
+// check runs all checks and user-defined validators on the builder.
+func (_c *UserCreate) check() error {
+	if _, ok := _c.mutation.Age(); !ok {
+		return &ValidationError{Name: "age", err: errors.New(`ent: missing required field "User.age"`)}
+	}
+	if _, ok := _c.mutation.Name(); !ok {
+		return &ValidationError{Name: "name", err: errors.New(`ent: missing required field "User.name"`)}
+	}
+	return nil
+}
+
+func (_c *UserCreate) sqlSave(ctx context.Context) (*User, error) {
+	if err := _c.check(); err != nil {
+		return nil, err
+	}
+	_node, _spec := _c.createSpec()
+	if err := sqlgraph.CreateNode(ctx, _c.driver, _spec); err != nil {
+		if sqlgraph.IsConstraintError(err) {
+			err = &ConstraintError{msg: err.Error(), wrap: err}
+		}
+		return nil, err
+	}
+	id := _spec.ID.Value.(int64)
+	_node.ID = int(id)
+	_c.mutation.id = &_node.ID
+	_c.mutation.done = true
+	return _node, nil
+}
+
+func (_c *UserCreate) createSpec() (*User, *sqlgraph.CreateSpec) {
+	var (
+		_node = &User{config: _c.config}
+		_spec = sqlgraph.NewCreateSpec(user.Table, sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt))
+	)
+	if value, ok := _c.mutation.Age(); ok {
+		_spec.SetField(user.FieldAge, field.TypeInt, value)
+		_node.Age = value
+	}
+	if value, ok := _c.mutation.Name(); ok {
+		_spec.SetField(user.FieldName, field.TypeString, value)
+		_node.Name = value
+	}
+	if nodes := _c.mutation.PetsIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: false,
+			Table:   user.PetsTable,
+			Columns: []string{user.PetsColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges = append(_spec.Edges, edge)
+	}
+	if nodes := _c.mutation.FriendsIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   user.FriendsTable,
+			Columns: user.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges = append(_spec.Edges, edge)
+	}
+	if nodes := _c.mutation.GroupsIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: true,
+			Table:   user.GroupsTable,
+			Columns: user.GroupsPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges = append(_spec.Edges, edge)
+	}
+	if nodes := _c.mutation.ManageIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: true,
+			Table:   user.ManageTable,
+			Columns: []string{user.ManageColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges = append(_spec.Edges, edge)
+	}
+	return _node, _spec
+}
+
+// UserCreateBulk is the builder for creating many User entities in bulk.
+type UserCreateBulk struct {
+	config
+	err      error
+	builders []*UserCreate
+}
+
+// Save creates the User entities in the database.
+func (_c *UserCreateBulk) Save(ctx context.Context) ([]*User, error) {
+	if _c.err != nil {
+		return nil, _c.err
+	}
+	specs := make([]*sqlgraph.CreateSpec, len(_c.builders))
+	nodes := make([]*User, len(_c.builders))
+	mutators := make([]Mutator, len(_c.builders))
+	for i := range _c.builders {
+		func(i int, root context.Context) {
+			builder := _c.builders[i]
+			var mut Mutator = MutateFunc(func(ctx context.Context, m Mutation) (Value, error) {
+				mutation, ok := m.(*UserMutation)
+				if !ok {
+					return nil, fmt.Errorf("unexpected mutation type %T", m)
+				}
+				if err := builder.check(); err != nil {
+					return nil, err
+				}
+				builder.mutation = mutation
+				var err error
+				nodes[i], specs[i] = builder.createSpec()
+				if i < len(mutators)-1 {
+					_, err = mutators[i+1].Mutate(root, _c.builders[i+1].mutation)
+				} else {
+					spec := &sqlgraph.BatchCreateSpec{Nodes: specs}
+					// Invoke the actual operation on the latest mutation in the chain.
+					if err = sqlgraph.BatchCreate(ctx, _c.driver, spec); err != nil {
+						if sqlgraph.IsConstraintError(err) {
+							err = &ConstraintError{msg: err.Error(), wrap: err}
+						}
+					}
+				}
+				if err != nil {
+					return nil, err
+				}
+				mutation.id = &nodes[i].ID
+				if specs[i].ID.Value != nil {
+					id := specs[i].ID.Value.(int64)
+					nodes[i].ID = int(id)
+				}
+				mutation.done = true
+				return nodes[i], nil
+			})
+			for i := len(builder.hooks) - 1; i >= 0; i-- {
+				mut = builder.hooks[i](mut)
+			}
+			mutators[i] = mut
+		}(i, ctx)
+	}
+	if len(mutators) > 0 {
+		if _, err := mutators[0].Mutate(ctx, _c.builders[0].mutation); err != nil {
+			return nil, err
+		}
+	}
+	return nodes, nil
+}
+
+// SaveX is like Save, but panics if an error occurs.
+func (_c *UserCreateBulk) SaveX(ctx context.Context) []*User {
+	v, err := _c.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Exec executes the query.
+func (_c *UserCreateBulk) Exec(ctx context.Context) error {
+	_, err := _c.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_c *UserCreateBulk) ExecX(ctx context.Context) {
+	if err := _c.Exec(ctx); err != nil {
+		panic(err)
+	}
+}

examples/traversal/ent/user_delete.go

@@ -0,0 +1,92 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+	"entgo.io/ent/examples/traversal/ent/user"
+	"entgo.io/ent/schema/field"
+)
+
+// UserDelete is the builder for deleting a User entity.
+type UserDelete struct {
+	config
+	hooks    []Hook
+	mutation *UserMutation
+}
+
+// Where appends a list predicates to the UserDelete builder.
+func (_d *UserDelete) Where(ps ...predicate.User) *UserDelete {
+	_d.mutation.Where(ps...)
+	return _d
+}
+
+// Exec executes the deletion query and returns how many vertices were deleted.
+func (_d *UserDelete) Exec(ctx context.Context) (int, error) {
+	return withHooks(ctx, _d.sqlExec, _d.mutation, _d.hooks)
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_d *UserDelete) ExecX(ctx context.Context) int {
+	n, err := _d.Exec(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}
+
+func (_d *UserDelete) sqlExec(ctx context.Context) (int, error) {
+	_spec := sqlgraph.NewDeleteSpec(user.Table, sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt))
+	if ps := _d.mutation.Predicates(); len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	affected, err := sqlgraph.DeleteNodes(ctx, _d.driver, _spec)
+	if err != nil && sqlgraph.IsConstraintError(err) {
+		err = &ConstraintError{msg: err.Error(), wrap: err}
+	}
+	_d.mutation.done = true
+	return affected, err
+}
+
+// UserDeleteOne is the builder for deleting a single User entity.
+type UserDeleteOne struct {
+	_d *UserDelete
+}
+
+// Where appends a list predicates to the UserDelete builder.
+func (_d *UserDeleteOne) Where(ps ...predicate.User) *UserDeleteOne {
+	_d._d.mutation.Where(ps...)
+	return _d
+}
+
+// Exec executes the deletion query.
+func (_d *UserDeleteOne) Exec(ctx context.Context) error {
+	n, err := _d._d.Exec(ctx)
+	switch {
+	case err != nil:
+		return err
+	case n == 0:
+		return &NotFoundError{user.Label}
+	default:
+		return nil
+	}
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_d *UserDeleteOne) ExecX(ctx context.Context) {
+	if err := _d.Exec(ctx); err != nil {
+		panic(err)
+	}
+}

examples/traversal/ent/user_query.go

@@ -0,0 +1,894 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"database/sql/driver"
+	"fmt"
+	"math"
+
+	"entgo.io/ent"
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/group"
+	"entgo.io/ent/examples/traversal/ent/pet"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+	"entgo.io/ent/examples/traversal/ent/user"
+	"entgo.io/ent/schema/field"
+)
+
+// UserQuery is the builder for querying User entities.
+type UserQuery struct {
+	config
+	ctx         *QueryContext
+	order       []user.OrderOption
+	inters      []Interceptor
+	predicates  []predicate.User
+	withPets    *PetQuery
+	withFriends *UserQuery
+	withGroups  *GroupQuery
+	withManage  *GroupQuery
+	// intermediate query (i.e. traversal path).
+	sql  *sql.Selector
+	path func(context.Context) (*sql.Selector, error)
+}
+
+// Where adds a new predicate for the UserQuery builder.
+func (_q *UserQuery) Where(ps ...predicate.User) *UserQuery {
+	_q.predicates = append(_q.predicates, ps...)
+	return _q
+}
+
+// Limit the number of records to be returned by this query.
+func (_q *UserQuery) Limit(limit int) *UserQuery {
+	_q.ctx.Limit = &limit
+	return _q
+}
+
+// Offset to start from.
+func (_q *UserQuery) Offset(offset int) *UserQuery {
+	_q.ctx.Offset = &offset
+	return _q
+}
+
+// Unique configures the query builder to filter duplicate records on query.
+// By default, unique is set to true, and can be disabled using this method.
+func (_q *UserQuery) Unique(unique bool) *UserQuery {
+	_q.ctx.Unique = &unique
+	return _q
+}
+
+// Order specifies how the records should be ordered.
+func (_q *UserQuery) Order(o ...user.OrderOption) *UserQuery {
+	_q.order = append(_q.order, o...)
+	return _q
+}
+
+// QueryPets chains the current query on the "pets" edge.
+func (_q *UserQuery) QueryPets() *PetQuery {
+	query := (&PetClient{config: _q.config}).Query()
+	query.path = func(ctx context.Context) (fromU *sql.Selector, err error) {
+		if err := _q.prepareQuery(ctx); err != nil {
+			return nil, err
+		}
+		selector := _q.sqlQuery(ctx)
+		if err := selector.Err(); err != nil {
+			return nil, err
+		}
+		step := sqlgraph.NewStep(
+			sqlgraph.From(user.Table, user.FieldID, selector),
+			sqlgraph.To(pet.Table, pet.FieldID),
+			sqlgraph.Edge(sqlgraph.O2M, false, user.PetsTable, user.PetsColumn),
+		)
+		fromU = sqlgraph.SetNeighbors(_q.driver.Dialect(), step)
+		return fromU, nil
+	}
+	return query
+}
+
+// QueryFriends chains the current query on the "friends" edge.
+func (_q *UserQuery) QueryFriends() *UserQuery {
+	query := (&UserClient{config: _q.config}).Query()
+	query.path = func(ctx context.Context) (fromU *sql.Selector, err error) {
+		if err := _q.prepareQuery(ctx); err != nil {
+			return nil, err
+		}
+		selector := _q.sqlQuery(ctx)
+		if err := selector.Err(); err != nil {
+			return nil, err
+		}
+		step := sqlgraph.NewStep(
+			sqlgraph.From(user.Table, user.FieldID, selector),
+			sqlgraph.To(user.Table, user.FieldID),
+			sqlgraph.Edge(sqlgraph.M2M, false, user.FriendsTable, user.FriendsPrimaryKey...),
+		)
+		fromU = sqlgraph.SetNeighbors(_q.driver.Dialect(), step)
+		return fromU, nil
+	}
+	return query
+}
+
+// QueryGroups chains the current query on the "groups" edge.
+func (_q *UserQuery) QueryGroups() *GroupQuery {
+	query := (&GroupClient{config: _q.config}).Query()
+	query.path = func(ctx context.Context) (fromU *sql.Selector, err error) {
+		if err := _q.prepareQuery(ctx); err != nil {
+			return nil, err
+		}
+		selector := _q.sqlQuery(ctx)
+		if err := selector.Err(); err != nil {
+			return nil, err
+		}
+		step := sqlgraph.NewStep(
+			sqlgraph.From(user.Table, user.FieldID, selector),
+			sqlgraph.To(group.Table, group.FieldID),
+			sqlgraph.Edge(sqlgraph.M2M, true, user.GroupsTable, user.GroupsPrimaryKey...),
+		)
+		fromU = sqlgraph.SetNeighbors(_q.driver.Dialect(), step)
+		return fromU, nil
+	}
+	return query
+}
+
+// QueryManage chains the current query on the "manage" edge.
+func (_q *UserQuery) QueryManage() *GroupQuery {
+	query := (&GroupClient{config: _q.config}).Query()
+	query.path = func(ctx context.Context) (fromU *sql.Selector, err error) {
+		if err := _q.prepareQuery(ctx); err != nil {
+			return nil, err
+		}
+		selector := _q.sqlQuery(ctx)
+		if err := selector.Err(); err != nil {
+			return nil, err
+		}
+		step := sqlgraph.NewStep(
+			sqlgraph.From(user.Table, user.FieldID, selector),
+			sqlgraph.To(group.Table, group.FieldID),
+			sqlgraph.Edge(sqlgraph.O2M, true, user.ManageTable, user.ManageColumn),
+		)
+		fromU = sqlgraph.SetNeighbors(_q.driver.Dialect(), step)
+		return fromU, nil
+	}
+	return query
+}
+
+// First returns the first User entity from the query.
+// Returns a *NotFoundError when no User was found.
+func (_q *UserQuery) First(ctx context.Context) (*User, error) {
+	nodes, err := _q.Limit(1).All(setContextOp(ctx, _q.ctx, ent.OpQueryFirst))
+	if err != nil {
+		return nil, err
+	}
+	if len(nodes) == 0 {
+		return nil, &NotFoundError{user.Label}
+	}
+	return nodes[0], nil
+}
+
+// FirstX is like First, but panics if an error occurs.
+func (_q *UserQuery) FirstX(ctx context.Context) *User {
+	node, err := _q.First(ctx)
+	if err != nil && !IsNotFound(err) {
+		panic(err)
+	}
+	return node
+}
+
+// FirstID returns the first User ID from the query.
+// Returns a *NotFoundError when no User ID was found.
+func (_q *UserQuery) FirstID(ctx context.Context) (id int, err error) {
+	var ids []int
+	if ids, err = _q.Limit(1).IDs(setContextOp(ctx, _q.ctx, ent.OpQueryFirstID)); err != nil {
+		return
+	}
+	if len(ids) == 0 {
+		err = &NotFoundError{user.Label}
+		return
+	}
+	return ids[0], nil
+}
+
+// FirstIDX is like FirstID, but panics if an error occurs.
+func (_q *UserQuery) FirstIDX(ctx context.Context) int {
+	id, err := _q.FirstID(ctx)
+	if err != nil && !IsNotFound(err) {
+		panic(err)
+	}
+	return id
+}
+
+// Only returns a single User entity found by the query, ensuring it only returns one.
+// Returns a *NotSingularError when more than one User entity is found.
+// Returns a *NotFoundError when no User entities are found.
+func (_q *UserQuery) Only(ctx context.Context) (*User, error) {
+	nodes, err := _q.Limit(2).All(setContextOp(ctx, _q.ctx, ent.OpQueryOnly))
+	if err != nil {
+		return nil, err
+	}
+	switch len(nodes) {
+	case 1:
+		return nodes[0], nil
+	case 0:
+		return nil, &NotFoundError{user.Label}
+	default:
+		return nil, &NotSingularError{user.Label}
+	}
+}
+
+// OnlyX is like Only, but panics if an error occurs.
+func (_q *UserQuery) OnlyX(ctx context.Context) *User {
+	node, err := _q.Only(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return node
+}
+
+// OnlyID is like Only, but returns the only User ID in the query.
+// Returns a *NotSingularError when more than one User ID is found.
+// Returns a *NotFoundError when no entities are found.
+func (_q *UserQuery) OnlyID(ctx context.Context) (id int, err error) {
+	var ids []int
+	if ids, err = _q.Limit(2).IDs(setContextOp(ctx, _q.ctx, ent.OpQueryOnlyID)); err != nil {
+		return
+	}
+	switch len(ids) {
+	case 1:
+		id = ids[0]
+	case 0:
+		err = &NotFoundError{user.Label}
+	default:
+		err = &NotSingularError{user.Label}
+	}
+	return
+}
+
+// OnlyIDX is like OnlyID, but panics if an error occurs.
+func (_q *UserQuery) OnlyIDX(ctx context.Context) int {
+	id, err := _q.OnlyID(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return id
+}
+
+// All executes the query and returns a list of Users.
+func (_q *UserQuery) All(ctx context.Context) ([]*User, error) {
+	ctx = setContextOp(ctx, _q.ctx, ent.OpQueryAll)
+	if err := _q.prepareQuery(ctx); err != nil {
+		return nil, err
+	}
+	qr := querierAll[[]*User, *UserQuery]()
+	return withInterceptors[[]*User](ctx, _q, qr, _q.inters)
+}
+
+// AllX is like All, but panics if an error occurs.
+func (_q *UserQuery) AllX(ctx context.Context) []*User {
+	nodes, err := _q.All(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return nodes
+}
+
+// IDs executes the query and returns a list of User IDs.
+func (_q *UserQuery) IDs(ctx context.Context) (ids []int, err error) {
+	if _q.ctx.Unique == nil && _q.path != nil {
+		_q.Unique(true)
+	}
+	ctx = setContextOp(ctx, _q.ctx, ent.OpQueryIDs)
+	if err = _q.Select(user.FieldID).Scan(ctx, &ids); err != nil {
+		return nil, err
+	}
+	return ids, nil
+}
+
+// IDsX is like IDs, but panics if an error occurs.
+func (_q *UserQuery) IDsX(ctx context.Context) []int {
+	ids, err := _q.IDs(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return ids
+}
+
+// Count returns the count of the given query.
+func (_q *UserQuery) Count(ctx context.Context) (int, error) {
+	ctx = setContextOp(ctx, _q.ctx, ent.OpQueryCount)
+	if err := _q.prepareQuery(ctx); err != nil {
+		return 0, err
+	}
+	return withInterceptors[int](ctx, _q, querierCount[*UserQuery](), _q.inters)
+}
+
+// CountX is like Count, but panics if an error occurs.
+func (_q *UserQuery) CountX(ctx context.Context) int {
+	count, err := _q.Count(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return count
+}
+
+// Exist returns true if the query has elements in the graph.
+func (_q *UserQuery) Exist(ctx context.Context) (bool, error) {
+	ctx = setContextOp(ctx, _q.ctx, ent.OpQueryExist)
+	switch _, err := _q.FirstID(ctx); {
+	case IsNotFound(err):
+		return false, nil
+	case err != nil:
+		return false, fmt.Errorf("ent: check existence: %w", err)
+	default:
+		return true, nil
+	}
+}
+
+// ExistX is like Exist, but panics if an error occurs.
+func (_q *UserQuery) ExistX(ctx context.Context) bool {
+	exist, err := _q.Exist(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return exist
+}
+
+// Clone returns a duplicate of the UserQuery builder, including all associated steps. It can be
+// used to prepare common query builders and use them differently after the clone is made.
+func (_q *UserQuery) Clone() *UserQuery {
+	if _q == nil {
+		return nil
+	}
+	return &UserQuery{
+		config:      _q.config,
+		ctx:         _q.ctx.Clone(),
+		order:       append([]user.OrderOption{}, _q.order...),
+		inters:      append([]Interceptor{}, _q.inters...),
+		predicates:  append([]predicate.User{}, _q.predicates...),
+		withPets:    _q.withPets.Clone(),
+		withFriends: _q.withFriends.Clone(),
+		withGroups:  _q.withGroups.Clone(),
+		withManage:  _q.withManage.Clone(),
+		// clone intermediate query.
+		sql:  _q.sql.Clone(),
+		path: _q.path,
+	}
+}
+
+// WithPets tells the query-builder to eager-load the nodes that are connected to
+// the "pets" edge. The optional arguments are used to configure the query builder of the edge.
+func (_q *UserQuery) WithPets(opts ...func(*PetQuery)) *UserQuery {
+	query := (&PetClient{config: _q.config}).Query()
+	for _, opt := range opts {
+		opt(query)
+	}
+	_q.withPets = query
+	return _q
+}
+
+// WithFriends tells the query-builder to eager-load the nodes that are connected to
+// the "friends" edge. The optional arguments are used to configure the query builder of the edge.
+func (_q *UserQuery) WithFriends(opts ...func(*UserQuery)) *UserQuery {
+	query := (&UserClient{config: _q.config}).Query()
+	for _, opt := range opts {
+		opt(query)
+	}
+	_q.withFriends = query
+	return _q
+}
+
+// WithGroups tells the query-builder to eager-load the nodes that are connected to
+// the "groups" edge. The optional arguments are used to configure the query builder of the edge.
+func (_q *UserQuery) WithGroups(opts ...func(*GroupQuery)) *UserQuery {
+	query := (&GroupClient{config: _q.config}).Query()
+	for _, opt := range opts {
+		opt(query)
+	}
+	_q.withGroups = query
+	return _q
+}
+
+// WithManage tells the query-builder to eager-load the nodes that are connected to
+// the "manage" edge. The optional arguments are used to configure the query builder of the edge.
+func (_q *UserQuery) WithManage(opts ...func(*GroupQuery)) *UserQuery {
+	query := (&GroupClient{config: _q.config}).Query()
+	for _, opt := range opts {
+		opt(query)
+	}
+	_q.withManage = query
+	return _q
+}
+
+// GroupBy is used to group vertices by one or more fields/columns.
+// It is often used with aggregate functions, like: count, max, mean, min, sum.
+//
+// Example:
+//
+//	var v []struct {
+//		Age int `json:"age,omitempty"`
+//		Count int `json:"count,omitempty"`
+//	}
+//
+//	client.User.Query().
+//		GroupBy(user.FieldAge).
+//		Aggregate(ent.Count()).
+//		Scan(ctx, &v)
+func (_q *UserQuery) GroupBy(field string, fields ...string) *UserGroupBy {
+	_q.ctx.Fields = append([]string{field}, fields...)
+	grbuild := &UserGroupBy{build: _q}
+	grbuild.flds = &_q.ctx.Fields
+	grbuild.label = user.Label
+	grbuild.scan = grbuild.Scan
+	return grbuild
+}
+
+// Select allows the selection one or more fields/columns for the given query,
+// instead of selecting all fields in the entity.
+//
+// Example:
+//
+//	var v []struct {
+//		Age int `json:"age,omitempty"`
+//	}
+//
+//	client.User.Query().
+//		Select(user.FieldAge).
+//		Scan(ctx, &v)
+func (_q *UserQuery) Select(fields ...string) *UserSelect {
+	_q.ctx.Fields = append(_q.ctx.Fields, fields...)
+	sbuild := &UserSelect{UserQuery: _q}
+	sbuild.label = user.Label
+	sbuild.flds, sbuild.scan = &_q.ctx.Fields, sbuild.Scan
+	return sbuild
+}
+
+// Aggregate returns a UserSelect configured with the given aggregations.
+func (_q *UserQuery) Aggregate(fns ...AggregateFunc) *UserSelect {
+	return _q.Select().Aggregate(fns...)
+}
+
+func (_q *UserQuery) prepareQuery(ctx context.Context) error {
+	for _, inter := range _q.inters {
+		if inter == nil {
+			return fmt.Errorf("ent: uninitialized interceptor (forgotten import ent/runtime?)")
+		}
+		if trv, ok := inter.(Traverser); ok {
+			if err := trv.Traverse(ctx, _q); err != nil {
+				return err
+			}
+		}
+	}
+	for _, f := range _q.ctx.Fields {
+		if !user.ValidColumn(f) {
+			return &ValidationError{Name: f, err: fmt.Errorf("ent: invalid field %q for query", f)}
+		}
+	}
+	if _q.path != nil {
+		prev, err := _q.path(ctx)
+		if err != nil {
+			return err
+		}
+		_q.sql = prev
+	}
+	return nil
+}
+
+func (_q *UserQuery) sqlAll(ctx context.Context, hooks ...queryHook) ([]*User, error) {
+	var (
+		nodes       = []*User{}
+		_spec       = _q.querySpec()
+		loadedTypes = [4]bool{
+			_q.withPets != nil,
+			_q.withFriends != nil,
+			_q.withGroups != nil,
+			_q.withManage != nil,
+		}
+	)
+	_spec.ScanValues = func(columns []string) ([]any, error) {
+		return (*User).scanValues(nil, columns)
+	}
+	_spec.Assign = func(columns []string, values []any) error {
+		node := &User{config: _q.config}
+		nodes = append(nodes, node)
+		node.Edges.loadedTypes = loadedTypes
+		return node.assignValues(columns, values)
+	}
+	for i := range hooks {
+		hooks[i](ctx, _spec)
+	}
+	if err := sqlgraph.QueryNodes(ctx, _q.driver, _spec); err != nil {
+		return nil, err
+	}
+	if len(nodes) == 0 {
+		return nodes, nil
+	}
+	if query := _q.withPets; query != nil {
+		if err := _q.loadPets(ctx, query, nodes,
+			func(n *User) { n.Edges.Pets = []*Pet{} },
+			func(n *User, e *Pet) { n.Edges.Pets = append(n.Edges.Pets, e) }); err != nil {
+			return nil, err
+		}
+	}
+	if query := _q.withFriends; query != nil {
+		if err := _q.loadFriends(ctx, query, nodes,
+			func(n *User) { n.Edges.Friends = []*User{} },
+			func(n *User, e *User) { n.Edges.Friends = append(n.Edges.Friends, e) }); err != nil {
+			return nil, err
+		}
+	}
+	if query := _q.withGroups; query != nil {
+		if err := _q.loadGroups(ctx, query, nodes,
+			func(n *User) { n.Edges.Groups = []*Group{} },
+			func(n *User, e *Group) { n.Edges.Groups = append(n.Edges.Groups, e) }); err != nil {
+			return nil, err
+		}
+	}
+	if query := _q.withManage; query != nil {
+		if err := _q.loadManage(ctx, query, nodes,
+			func(n *User) { n.Edges.Manage = []*Group{} },
+			func(n *User, e *Group) { n.Edges.Manage = append(n.Edges.Manage, e) }); err != nil {
+			return nil, err
+		}
+	}
+	return nodes, nil
+}
+
+func (_q *UserQuery) loadPets(ctx context.Context, query *PetQuery, nodes []*User, init func(*User), assign func(*User, *Pet)) error {
+	fks := make([]driver.Value, 0, len(nodes))
+	nodeids := make(map[int]*User)
+	for i := range nodes {
+		fks = append(fks, nodes[i].ID)
+		nodeids[nodes[i].ID] = nodes[i]
+		if init != nil {
+			init(nodes[i])
+		}
+	}
+	query.withFKs = true
+	query.Where(predicate.Pet(func(s *sql.Selector) {
+		s.Where(sql.InValues(s.C(user.PetsColumn), fks...))
+	}))
+	neighbors, err := query.All(ctx)
+	if err != nil {
+		return err
+	}
+	for _, n := range neighbors {
+		fk := n.user_pets
+		if fk == nil {
+			return fmt.Errorf(`foreign-key "user_pets" is nil for node %v`, n.ID)
+		}
+		node, ok := nodeids[*fk]
+		if !ok {
+			return fmt.Errorf(`unexpected referenced foreign-key "user_pets" returned %v for node %v`, *fk, n.ID)
+		}
+		assign(node, n)
+	}
+	return nil
+}
+func (_q *UserQuery) loadFriends(ctx context.Context, query *UserQuery, nodes []*User, init func(*User), assign func(*User, *User)) error {
+	edgeIDs := make([]driver.Value, len(nodes))
+	byID := make(map[int]*User)
+	nids := make(map[int]map[*User]struct{})
+	for i, node := range nodes {
+		edgeIDs[i] = node.ID
+		byID[node.ID] = node
+		if init != nil {
+			init(node)
+		}
+	}
+	query.Where(func(s *sql.Selector) {
+		joinT := sql.Table(user.FriendsTable)
+		s.Join(joinT).On(s.C(user.FieldID), joinT.C(user.FriendsPrimaryKey[1]))
+		s.Where(sql.InValues(joinT.C(user.FriendsPrimaryKey[0]), edgeIDs...))
+		columns := s.SelectedColumns()
+		s.Select(joinT.C(user.FriendsPrimaryKey[0]))
+		s.AppendSelect(columns...)
+		s.SetDistinct(false)
+	})
+	if err := query.prepareQuery(ctx); err != nil {
+		return err
+	}
+	qr := QuerierFunc(func(ctx context.Context, q Query) (Value, error) {
+		return query.sqlAll(ctx, func(_ context.Context, spec *sqlgraph.QuerySpec) {
+			assign := spec.Assign
+			values := spec.ScanValues
+			spec.ScanValues = func(columns []string) ([]any, error) {
+				values, err := values(columns[1:])
+				if err != nil {
+					return nil, err
+				}
+				return append([]any{new(sql.NullInt64)}, values...), nil
+			}
+			spec.Assign = func(columns []string, values []any) error {
+				outValue := int(values[0].(*sql.NullInt64).Int64)
+				inValue := int(values[1].(*sql.NullInt64).Int64)
+				if nids[inValue] == nil {
+					nids[inValue] = map[*User]struct{}{byID[outValue]: {}}
+					return assign(columns[1:], values[1:])
+				}
+				nids[inValue][byID[outValue]] = struct{}{}
+				return nil
+			}
+		})
+	})
+	neighbors, err := withInterceptors[[]*User](ctx, query, qr, query.inters)
+	if err != nil {
+		return err
+	}
+	for _, n := range neighbors {
+		nodes, ok := nids[n.ID]
+		if !ok {
+			return fmt.Errorf(`unexpected "friends" node returned %v`, n.ID)
+		}
+		for kn := range nodes {
+			assign(kn, n)
+		}
+	}
+	return nil
+}
+func (_q *UserQuery) loadGroups(ctx context.Context, query *GroupQuery, nodes []*User, init func(*User), assign func(*User, *Group)) error {
+	edgeIDs := make([]driver.Value, len(nodes))
+	byID := make(map[int]*User)
+	nids := make(map[int]map[*User]struct{})
+	for i, node := range nodes {
+		edgeIDs[i] = node.ID
+		byID[node.ID] = node
+		if init != nil {
+			init(node)
+		}
+	}
+	query.Where(func(s *sql.Selector) {
+		joinT := sql.Table(user.GroupsTable)
+		s.Join(joinT).On(s.C(group.FieldID), joinT.C(user.GroupsPrimaryKey[0]))
+		s.Where(sql.InValues(joinT.C(user.GroupsPrimaryKey[1]), edgeIDs...))
+		columns := s.SelectedColumns()
+		s.Select(joinT.C(user.GroupsPrimaryKey[1]))
+		s.AppendSelect(columns...)
+		s.SetDistinct(false)
+	})
+	if err := query.prepareQuery(ctx); err != nil {
+		return err
+	}
+	qr := QuerierFunc(func(ctx context.Context, q Query) (Value, error) {
+		return query.sqlAll(ctx, func(_ context.Context, spec *sqlgraph.QuerySpec) {
+			assign := spec.Assign
+			values := spec.ScanValues
+			spec.ScanValues = func(columns []string) ([]any, error) {
+				values, err := values(columns[1:])
+				if err != nil {
+					return nil, err
+				}
+				return append([]any{new(sql.NullInt64)}, values...), nil
+			}
+			spec.Assign = func(columns []string, values []any) error {
+				outValue := int(values[0].(*sql.NullInt64).Int64)
+				inValue := int(values[1].(*sql.NullInt64).Int64)
+				if nids[inValue] == nil {
+					nids[inValue] = map[*User]struct{}{byID[outValue]: {}}
+					return assign(columns[1:], values[1:])
+				}
+				nids[inValue][byID[outValue]] = struct{}{}
+				return nil
+			}
+		})
+	})
+	neighbors, err := withInterceptors[[]*Group](ctx, query, qr, query.inters)
+	if err != nil {
+		return err
+	}
+	for _, n := range neighbors {
+		nodes, ok := nids[n.ID]
+		if !ok {
+			return fmt.Errorf(`unexpected "groups" node returned %v`, n.ID)
+		}
+		for kn := range nodes {
+			assign(kn, n)
+		}
+	}
+	return nil
+}
+func (_q *UserQuery) loadManage(ctx context.Context, query *GroupQuery, nodes []*User, init func(*User), assign func(*User, *Group)) error {
+	fks := make([]driver.Value, 0, len(nodes))
+	nodeids := make(map[int]*User)
+	for i := range nodes {
+		fks = append(fks, nodes[i].ID)
+		nodeids[nodes[i].ID] = nodes[i]
+		if init != nil {
+			init(nodes[i])
+		}
+	}
+	query.withFKs = true
+	query.Where(predicate.Group(func(s *sql.Selector) {
+		s.Where(sql.InValues(s.C(user.ManageColumn), fks...))
+	}))
+	neighbors, err := query.All(ctx)
+	if err != nil {
+		return err
+	}
+	for _, n := range neighbors {
+		fk := n.group_admin
+		if fk == nil {
+			return fmt.Errorf(`foreign-key "group_admin" is nil for node %v`, n.ID)
+		}
+		node, ok := nodeids[*fk]
+		if !ok {
+			return fmt.Errorf(`unexpected referenced foreign-key "group_admin" returned %v for node %v`, *fk, n.ID)
+		}
+		assign(node, n)
+	}
+	return nil
+}
+
+func (_q *UserQuery) sqlCount(ctx context.Context) (int, error) {
+	_spec := _q.querySpec()
+	_spec.Node.Columns = _q.ctx.Fields
+	if len(_q.ctx.Fields) > 0 {
+		_spec.Unique = _q.ctx.Unique != nil && *_q.ctx.Unique
+	}
+	return sqlgraph.CountNodes(ctx, _q.driver, _spec)
+}
+
+func (_q *UserQuery) querySpec() *sqlgraph.QuerySpec {
+	_spec := sqlgraph.NewQuerySpec(user.Table, user.Columns, sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt))
+	_spec.From = _q.sql
+	if unique := _q.ctx.Unique; unique != nil {
+		_spec.Unique = *unique
+	} else if _q.path != nil {
+		_spec.Unique = true
+	}
+	if fields := _q.ctx.Fields; len(fields) > 0 {
+		_spec.Node.Columns = make([]string, 0, len(fields))
+		_spec.Node.Columns = append(_spec.Node.Columns, user.FieldID)
+		for i := range fields {
+			if fields[i] != user.FieldID {
+				_spec.Node.Columns = append(_spec.Node.Columns, fields[i])
+			}
+		}
+	}
+	if ps := _q.predicates; len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	if limit := _q.ctx.Limit; limit != nil {
+		_spec.Limit = *limit
+	}
+	if offset := _q.ctx.Offset; offset != nil {
+		_spec.Offset = *offset
+	}
+	if ps := _q.order; len(ps) > 0 {
+		_spec.Order = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	return _spec
+}
+
+func (_q *UserQuery) sqlQuery(ctx context.Context) *sql.Selector {
+	builder := sql.Dialect(_q.driver.Dialect())
+	t1 := builder.Table(user.Table)
+	columns := _q.ctx.Fields
+	if len(columns) == 0 {
+		columns = user.Columns
+	}
+	selector := builder.Select(t1.Columns(columns...)...).From(t1)
+	if _q.sql != nil {
+		selector = _q.sql
+		selector.Select(selector.Columns(columns...)...)
+	}
+	if _q.ctx.Unique != nil && *_q.ctx.Unique {
+		selector.Distinct()
+	}
+	for _, p := range _q.predicates {
+		p(selector)
+	}
+	for _, p := range _q.order {
+		p(selector)
+	}
+	if offset := _q.ctx.Offset; offset != nil {
+		// limit is mandatory for offset clause. We start
+		// with default value, and override it below if needed.
+		selector.Offset(*offset).Limit(math.MaxInt32)
+	}
+	if limit := _q.ctx.Limit; limit != nil {
+		selector.Limit(*limit)
+	}
+	return selector
+}
+
+// UserGroupBy is the group-by builder for User entities.
+type UserGroupBy struct {
+	selector
+	build *UserQuery
+}
+
+// Aggregate adds the given aggregation functions to the group-by query.
+func (_g *UserGroupBy) Aggregate(fns ...AggregateFunc) *UserGroupBy {
+	_g.fns = append(_g.fns, fns...)
+	return _g
+}
+
+// Scan applies the selector query and scans the result into the given value.
+func (_g *UserGroupBy) Scan(ctx context.Context, v any) error {
+	ctx = setContextOp(ctx, _g.build.ctx, ent.OpQueryGroupBy)
+	if err := _g.build.prepareQuery(ctx); err != nil {
+		return err
+	}
+	return scanWithInterceptors[*UserQuery, *UserGroupBy](ctx, _g.build, _g, _g.build.inters, v)
+}
+
+func (_g *UserGroupBy) sqlScan(ctx context.Context, root *UserQuery, v any) error {
+	selector := root.sqlQuery(ctx).Select()
+	aggregation := make([]string, 0, len(_g.fns))
+	for _, fn := range _g.fns {
+		aggregation = append(aggregation, fn(selector))
+	}
+	if len(selector.SelectedColumns()) == 0 {
+		columns := make([]string, 0, len(*_g.flds)+len(_g.fns))
+		for _, f := range *_g.flds {
+			columns = append(columns, selector.C(f))
+		}
+		columns = append(columns, aggregation...)
+		selector.Select(columns...)
+	}
+	selector.GroupBy(selector.Columns(*_g.flds...)...)
+	if err := selector.Err(); err != nil {
+		return err
+	}
+	rows := &sql.Rows{}
+	query, args := selector.Query()
+	if err := _g.build.driver.Query(ctx, query, args, rows); err != nil {
+		return err
+	}
+	defer rows.Close()
+	return sql.ScanSlice(rows, v)
+}
+
+// UserSelect is the builder for selecting fields of User entities.
+type UserSelect struct {
+	*UserQuery
+	selector
+}
+
+// Aggregate adds the given aggregation functions to the selector query.
+func (_s *UserSelect) Aggregate(fns ...AggregateFunc) *UserSelect {
+	_s.fns = append(_s.fns, fns...)
+	return _s
+}
+
+// Scan applies the selector query and scans the result into the given value.
+func (_s *UserSelect) Scan(ctx context.Context, v any) error {
+	ctx = setContextOp(ctx, _s.ctx, ent.OpQuerySelect)
+	if err := _s.prepareQuery(ctx); err != nil {
+		return err
+	}
+	return scanWithInterceptors[*UserQuery, *UserSelect](ctx, _s.UserQuery, _s, _s.inters, v)
+}
+
+func (_s *UserSelect) sqlScan(ctx context.Context, root *UserQuery, v any) error {
+	selector := root.sqlQuery(ctx)
+	aggregation := make([]string, 0, len(_s.fns))
+	for _, fn := range _s.fns {
+		aggregation = append(aggregation, fn(selector))
+	}
+	switch n := len(*_s.selector.flds); {
+	case n == 0 && len(aggregation) > 0:
+		selector.Select(aggregation...)
+	case n != 0 && len(aggregation) > 0:
+		selector.AppendSelect(aggregation...)
+	}
+	rows := &sql.Rows{}
+	query, args := selector.Query()
+	if err := _s.driver.Query(ctx, query, args, rows); err != nil {
+		return err
+	}
+	defer rows.Close()
+	return sql.ScanSlice(rows, v)
+}

examples/traversal/ent/user_update.go

@@ -0,0 +1,917 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/traversal/ent/group"
+	"entgo.io/ent/examples/traversal/ent/pet"
+	"entgo.io/ent/examples/traversal/ent/predicate"
+	"entgo.io/ent/examples/traversal/ent/user"
+	"entgo.io/ent/schema/field"
+)
+
+// UserUpdate is the builder for updating User entities.
+type UserUpdate struct {
+	config
+	hooks    []Hook
+	mutation *UserMutation
+}
+
+// Where appends a list predicates to the UserUpdate builder.
+func (_u *UserUpdate) Where(ps ...predicate.User) *UserUpdate {
+	_u.mutation.Where(ps...)
+	return _u
+}
+
+// SetAge sets the "age" field.
+func (_u *UserUpdate) SetAge(v int) *UserUpdate {
+	_u.mutation.ResetAge()
+	_u.mutation.SetAge(v)
+	return _u
+}
+
+// SetNillableAge sets the "age" field if the given value is not nil.
+func (_u *UserUpdate) SetNillableAge(v *int) *UserUpdate {
+	if v != nil {
+		_u.SetAge(*v)
+	}
+	return _u
+}
+
+// AddAge adds value to the "age" field.
+func (_u *UserUpdate) AddAge(v int) *UserUpdate {
+	_u.mutation.AddAge(v)
+	return _u
+}
+
+// SetName sets the "name" field.
+func (_u *UserUpdate) SetName(v string) *UserUpdate {
+	_u.mutation.SetName(v)
+	return _u
+}
+
+// SetNillableName sets the "name" field if the given value is not nil.
+func (_u *UserUpdate) SetNillableName(v *string) *UserUpdate {
+	if v != nil {
+		_u.SetName(*v)
+	}
+	return _u
+}
+
+// AddPetIDs adds the "pets" edge to the Pet entity by IDs.
+func (_u *UserUpdate) AddPetIDs(ids ...int) *UserUpdate {
+	_u.mutation.AddPetIDs(ids...)
+	return _u
+}
+
+// AddPets adds the "pets" edges to the Pet entity.
+func (_u *UserUpdate) AddPets(v ...*Pet) *UserUpdate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.AddPetIDs(ids...)
+}
+
+// AddFriendIDs adds the "friends" edge to the User entity by IDs.
+func (_u *UserUpdate) AddFriendIDs(ids ...int) *UserUpdate {
+	_u.mutation.AddFriendIDs(ids...)
+	return _u
+}
+
+// AddFriends adds the "friends" edges to the User entity.
+func (_u *UserUpdate) AddFriends(v ...*User) *UserUpdate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.AddFriendIDs(ids...)
+}
+
+// AddGroupIDs adds the "groups" edge to the Group entity by IDs.
+func (_u *UserUpdate) AddGroupIDs(ids ...int) *UserUpdate {
+	_u.mutation.AddGroupIDs(ids...)
+	return _u
+}
+
+// AddGroups adds the "groups" edges to the Group entity.
+func (_u *UserUpdate) AddGroups(v ...*Group) *UserUpdate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.AddGroupIDs(ids...)
+}
+
+// AddManageIDs adds the "manage" edge to the Group entity by IDs.
+func (_u *UserUpdate) AddManageIDs(ids ...int) *UserUpdate {
+	_u.mutation.AddManageIDs(ids...)
+	return _u
+}
+
+// AddManage adds the "manage" edges to the Group entity.
+func (_u *UserUpdate) AddManage(v ...*Group) *UserUpdate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.AddManageIDs(ids...)
+}
+
+// Mutation returns the UserMutation object of the builder.
+func (_u *UserUpdate) Mutation() *UserMutation {
+	return _u.mutation
+}
+
+// ClearPets clears all "pets" edges to the Pet entity.
+func (_u *UserUpdate) ClearPets() *UserUpdate {
+	_u.mutation.ClearPets()
+	return _u
+}
+
+// RemovePetIDs removes the "pets" edge to Pet entities by IDs.
+func (_u *UserUpdate) RemovePetIDs(ids ...int) *UserUpdate {
+	_u.mutation.RemovePetIDs(ids...)
+	return _u
+}
+
+// RemovePets removes "pets" edges to Pet entities.
+func (_u *UserUpdate) RemovePets(v ...*Pet) *UserUpdate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.RemovePetIDs(ids...)
+}
+
+// ClearFriends clears all "friends" edges to the User entity.
+func (_u *UserUpdate) ClearFriends() *UserUpdate {
+	_u.mutation.ClearFriends()
+	return _u
+}
+
+// RemoveFriendIDs removes the "friends" edge to User entities by IDs.
+func (_u *UserUpdate) RemoveFriendIDs(ids ...int) *UserUpdate {
+	_u.mutation.RemoveFriendIDs(ids...)
+	return _u
+}
+
+// RemoveFriends removes "friends" edges to User entities.
+func (_u *UserUpdate) RemoveFriends(v ...*User) *UserUpdate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.RemoveFriendIDs(ids...)
+}
+
+// ClearGroups clears all "groups" edges to the Group entity.
+func (_u *UserUpdate) ClearGroups() *UserUpdate {
+	_u.mutation.ClearGroups()
+	return _u
+}
+
+// RemoveGroupIDs removes the "groups" edge to Group entities by IDs.
+func (_u *UserUpdate) RemoveGroupIDs(ids ...int) *UserUpdate {
+	_u.mutation.RemoveGroupIDs(ids...)
+	return _u
+}
+
+// RemoveGroups removes "groups" edges to Group entities.
+func (_u *UserUpdate) RemoveGroups(v ...*Group) *UserUpdate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.RemoveGroupIDs(ids...)
+}
+
+// ClearManage clears all "manage" edges to the Group entity.
+func (_u *UserUpdate) ClearManage() *UserUpdate {
+	_u.mutation.ClearManage()
+	return _u
+}
+
+// RemoveManageIDs removes the "manage" edge to Group entities by IDs.
+func (_u *UserUpdate) RemoveManageIDs(ids ...int) *UserUpdate {
+	_u.mutation.RemoveManageIDs(ids...)
+	return _u
+}
+
+// RemoveManage removes "manage" edges to Group entities.
+func (_u *UserUpdate) RemoveManage(v ...*Group) *UserUpdate {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.RemoveManageIDs(ids...)
+}
+
+// Save executes the query and returns the number of nodes affected by the update operation.
+func (_u *UserUpdate) Save(ctx context.Context) (int, error) {
+	return withHooks(ctx, _u.sqlSave, _u.mutation, _u.hooks)
+}
+
+// SaveX is like Save, but panics if an error occurs.
+func (_u *UserUpdate) SaveX(ctx context.Context) int {
+	affected, err := _u.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return affected
+}
+
+// Exec executes the query.
+func (_u *UserUpdate) Exec(ctx context.Context) error {
+	_, err := _u.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_u *UserUpdate) ExecX(ctx context.Context) {
+	if err := _u.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
+
+func (_u *UserUpdate) sqlSave(ctx context.Context) (_node int, err error) {
+	_spec := sqlgraph.NewUpdateSpec(user.Table, user.Columns, sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt))
+	if ps := _u.mutation.Predicates(); len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	if value, ok := _u.mutation.Age(); ok {
+		_spec.SetField(user.FieldAge, field.TypeInt, value)
+	}
+	if value, ok := _u.mutation.AddedAge(); ok {
+		_spec.AddField(user.FieldAge, field.TypeInt, value)
+	}
+	if value, ok := _u.mutation.Name(); ok {
+		_spec.SetField(user.FieldName, field.TypeString, value)
+	}
+	if _u.mutation.PetsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: false,
+			Table:   user.PetsTable,
+			Columns: []string{user.PetsColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.RemovedPetsIDs(); len(nodes) > 0 && !_u.mutation.PetsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: false,
+			Table:   user.PetsTable,
+			Columns: []string{user.PetsColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.PetsIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: false,
+			Table:   user.PetsTable,
+			Columns: []string{user.PetsColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	if _u.mutation.FriendsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   user.FriendsTable,
+			Columns: user.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.RemovedFriendsIDs(); len(nodes) > 0 && !_u.mutation.FriendsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   user.FriendsTable,
+			Columns: user.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.FriendsIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   user.FriendsTable,
+			Columns: user.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	if _u.mutation.GroupsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: true,
+			Table:   user.GroupsTable,
+			Columns: user.GroupsPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.RemovedGroupsIDs(); len(nodes) > 0 && !_u.mutation.GroupsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: true,
+			Table:   user.GroupsTable,
+			Columns: user.GroupsPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.GroupsIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: true,
+			Table:   user.GroupsTable,
+			Columns: user.GroupsPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	if _u.mutation.ManageCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: true,
+			Table:   user.ManageTable,
+			Columns: []string{user.ManageColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.RemovedManageIDs(); len(nodes) > 0 && !_u.mutation.ManageCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: true,
+			Table:   user.ManageTable,
+			Columns: []string{user.ManageColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.ManageIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: true,
+			Table:   user.ManageTable,
+			Columns: []string{user.ManageColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	if _node, err = sqlgraph.UpdateNodes(ctx, _u.driver, _spec); err != nil {
+		if _, ok := err.(*sqlgraph.NotFoundError); ok {
+			err = &NotFoundError{user.Label}
+		} else if sqlgraph.IsConstraintError(err) {
+			err = &ConstraintError{msg: err.Error(), wrap: err}
+		}
+		return 0, err
+	}
+	_u.mutation.done = true
+	return _node, nil
+}
+
+// UserUpdateOne is the builder for updating a single User entity.
+type UserUpdateOne struct {
+	config
+	fields   []string
+	hooks    []Hook
+	mutation *UserMutation
+}
+
+// SetAge sets the "age" field.
+func (_u *UserUpdateOne) SetAge(v int) *UserUpdateOne {
+	_u.mutation.ResetAge()
+	_u.mutation.SetAge(v)
+	return _u
+}
+
+// SetNillableAge sets the "age" field if the given value is not nil.
+func (_u *UserUpdateOne) SetNillableAge(v *int) *UserUpdateOne {
+	if v != nil {
+		_u.SetAge(*v)
+	}
+	return _u
+}
+
+// AddAge adds value to the "age" field.
+func (_u *UserUpdateOne) AddAge(v int) *UserUpdateOne {
+	_u.mutation.AddAge(v)
+	return _u
+}
+
+// SetName sets the "name" field.
+func (_u *UserUpdateOne) SetName(v string) *UserUpdateOne {
+	_u.mutation.SetName(v)
+	return _u
+}
+
+// SetNillableName sets the "name" field if the given value is not nil.
+func (_u *UserUpdateOne) SetNillableName(v *string) *UserUpdateOne {
+	if v != nil {
+		_u.SetName(*v)
+	}
+	return _u
+}
+
+// AddPetIDs adds the "pets" edge to the Pet entity by IDs.
+func (_u *UserUpdateOne) AddPetIDs(ids ...int) *UserUpdateOne {
+	_u.mutation.AddPetIDs(ids...)
+	return _u
+}
+
+// AddPets adds the "pets" edges to the Pet entity.
+func (_u *UserUpdateOne) AddPets(v ...*Pet) *UserUpdateOne {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.AddPetIDs(ids...)
+}
+
+// AddFriendIDs adds the "friends" edge to the User entity by IDs.
+func (_u *UserUpdateOne) AddFriendIDs(ids ...int) *UserUpdateOne {
+	_u.mutation.AddFriendIDs(ids...)
+	return _u
+}
+
+// AddFriends adds the "friends" edges to the User entity.
+func (_u *UserUpdateOne) AddFriends(v ...*User) *UserUpdateOne {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.AddFriendIDs(ids...)
+}
+
+// AddGroupIDs adds the "groups" edge to the Group entity by IDs.
+func (_u *UserUpdateOne) AddGroupIDs(ids ...int) *UserUpdateOne {
+	_u.mutation.AddGroupIDs(ids...)
+	return _u
+}
+
+// AddGroups adds the "groups" edges to the Group entity.
+func (_u *UserUpdateOne) AddGroups(v ...*Group) *UserUpdateOne {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.AddGroupIDs(ids...)
+}
+
+// AddManageIDs adds the "manage" edge to the Group entity by IDs.
+func (_u *UserUpdateOne) AddManageIDs(ids ...int) *UserUpdateOne {
+	_u.mutation.AddManageIDs(ids...)
+	return _u
+}
+
+// AddManage adds the "manage" edges to the Group entity.
+func (_u *UserUpdateOne) AddManage(v ...*Group) *UserUpdateOne {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.AddManageIDs(ids...)
+}
+
+// Mutation returns the UserMutation object of the builder.
+func (_u *UserUpdateOne) Mutation() *UserMutation {
+	return _u.mutation
+}
+
+// ClearPets clears all "pets" edges to the Pet entity.
+func (_u *UserUpdateOne) ClearPets() *UserUpdateOne {
+	_u.mutation.ClearPets()
+	return _u
+}
+
+// RemovePetIDs removes the "pets" edge to Pet entities by IDs.
+func (_u *UserUpdateOne) RemovePetIDs(ids ...int) *UserUpdateOne {
+	_u.mutation.RemovePetIDs(ids...)
+	return _u
+}
+
+// RemovePets removes "pets" edges to Pet entities.
+func (_u *UserUpdateOne) RemovePets(v ...*Pet) *UserUpdateOne {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.RemovePetIDs(ids...)
+}
+
+// ClearFriends clears all "friends" edges to the User entity.
+func (_u *UserUpdateOne) ClearFriends() *UserUpdateOne {
+	_u.mutation.ClearFriends()
+	return _u
+}
+
+// RemoveFriendIDs removes the "friends" edge to User entities by IDs.
+func (_u *UserUpdateOne) RemoveFriendIDs(ids ...int) *UserUpdateOne {
+	_u.mutation.RemoveFriendIDs(ids...)
+	return _u
+}
+
+// RemoveFriends removes "friends" edges to User entities.
+func (_u *UserUpdateOne) RemoveFriends(v ...*User) *UserUpdateOne {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.RemoveFriendIDs(ids...)
+}
+
+// ClearGroups clears all "groups" edges to the Group entity.
+func (_u *UserUpdateOne) ClearGroups() *UserUpdateOne {
+	_u.mutation.ClearGroups()
+	return _u
+}
+
+// RemoveGroupIDs removes the "groups" edge to Group entities by IDs.
+func (_u *UserUpdateOne) RemoveGroupIDs(ids ...int) *UserUpdateOne {
+	_u.mutation.RemoveGroupIDs(ids...)
+	return _u
+}
+
+// RemoveGroups removes "groups" edges to Group entities.
+func (_u *UserUpdateOne) RemoveGroups(v ...*Group) *UserUpdateOne {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.RemoveGroupIDs(ids...)
+}
+
+// ClearManage clears all "manage" edges to the Group entity.
+func (_u *UserUpdateOne) ClearManage() *UserUpdateOne {
+	_u.mutation.ClearManage()
+	return _u
+}
+
+// RemoveManageIDs removes the "manage" edge to Group entities by IDs.
+func (_u *UserUpdateOne) RemoveManageIDs(ids ...int) *UserUpdateOne {
+	_u.mutation.RemoveManageIDs(ids...)
+	return _u
+}
+
+// RemoveManage removes "manage" edges to Group entities.
+func (_u *UserUpdateOne) RemoveManage(v ...*Group) *UserUpdateOne {
+	ids := make([]int, len(v))
+	for i := range v {
+		ids[i] = v[i].ID
+	}
+	return _u.RemoveManageIDs(ids...)
+}
+
+// Where appends a list predicates to the UserUpdate builder.
+func (_u *UserUpdateOne) Where(ps ...predicate.User) *UserUpdateOne {
+	_u.mutation.Where(ps...)
+	return _u
+}
+
+// Select allows selecting one or more fields (columns) of the returned entity.
+// The default is selecting all fields defined in the entity schema.
+func (_u *UserUpdateOne) Select(field string, fields ...string) *UserUpdateOne {
+	_u.fields = append([]string{field}, fields...)
+	return _u
+}
+
+// Save executes the query and returns the updated User entity.
+func (_u *UserUpdateOne) Save(ctx context.Context) (*User, error) {
+	return withHooks(ctx, _u.sqlSave, _u.mutation, _u.hooks)
+}
+
+// SaveX is like Save, but panics if an error occurs.
+func (_u *UserUpdateOne) SaveX(ctx context.Context) *User {
+	node, err := _u.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return node
+}
+
+// Exec executes the query on the entity.
+func (_u *UserUpdateOne) Exec(ctx context.Context) error {
+	_, err := _u.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_u *UserUpdateOne) ExecX(ctx context.Context) {
+	if err := _u.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
+
+func (_u *UserUpdateOne) sqlSave(ctx context.Context) (_node *User, err error) {
+	_spec := sqlgraph.NewUpdateSpec(user.Table, user.Columns, sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt))
+	id, ok := _u.mutation.ID()
+	if !ok {
+		return nil, &ValidationError{Name: "id", err: errors.New(`ent: missing "User.id" for update`)}
+	}
+	_spec.Node.ID.Value = id
+	if fields := _u.fields; len(fields) > 0 {
+		_spec.Node.Columns = make([]string, 0, len(fields))
+		_spec.Node.Columns = append(_spec.Node.Columns, user.FieldID)
+		for _, f := range fields {
+			if !user.ValidColumn(f) {
+				return nil, &ValidationError{Name: f, err: fmt.Errorf("ent: invalid field %q for query", f)}
+			}
+			if f != user.FieldID {
+				_spec.Node.Columns = append(_spec.Node.Columns, f)
+			}
+		}
+	}
+	if ps := _u.mutation.Predicates(); len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	if value, ok := _u.mutation.Age(); ok {
+		_spec.SetField(user.FieldAge, field.TypeInt, value)
+	}
+	if value, ok := _u.mutation.AddedAge(); ok {
+		_spec.AddField(user.FieldAge, field.TypeInt, value)
+	}
+	if value, ok := _u.mutation.Name(); ok {
+		_spec.SetField(user.FieldName, field.TypeString, value)
+	}
+	if _u.mutation.PetsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: false,
+			Table:   user.PetsTable,
+			Columns: []string{user.PetsColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.RemovedPetsIDs(); len(nodes) > 0 && !_u.mutation.PetsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: false,
+			Table:   user.PetsTable,
+			Columns: []string{user.PetsColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.PetsIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: false,
+			Table:   user.PetsTable,
+			Columns: []string{user.PetsColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(pet.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	if _u.mutation.FriendsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   user.FriendsTable,
+			Columns: user.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.RemovedFriendsIDs(); len(nodes) > 0 && !_u.mutation.FriendsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   user.FriendsTable,
+			Columns: user.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.FriendsIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: false,
+			Table:   user.FriendsTable,
+			Columns: user.FriendsPrimaryKey,
+			Bidi:    true,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(user.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	if _u.mutation.GroupsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: true,
+			Table:   user.GroupsTable,
+			Columns: user.GroupsPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.RemovedGroupsIDs(); len(nodes) > 0 && !_u.mutation.GroupsCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: true,
+			Table:   user.GroupsTable,
+			Columns: user.GroupsPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.GroupsIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.M2M,
+			Inverse: true,
+			Table:   user.GroupsTable,
+			Columns: user.GroupsPrimaryKey,
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	if _u.mutation.ManageCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: true,
+			Table:   user.ManageTable,
+			Columns: []string{user.ManageColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.RemovedManageIDs(); len(nodes) > 0 && !_u.mutation.ManageCleared() {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: true,
+			Table:   user.ManageTable,
+			Columns: []string{user.ManageColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Clear = append(_spec.Edges.Clear, edge)
+	}
+	if nodes := _u.mutation.ManageIDs(); len(nodes) > 0 {
+		edge := &sqlgraph.EdgeSpec{
+			Rel:     sqlgraph.O2M,
+			Inverse: true,
+			Table:   user.ManageTable,
+			Columns: []string{user.ManageColumn},
+			Bidi:    false,
+			Target: &sqlgraph.EdgeTarget{
+				IDSpec: sqlgraph.NewFieldSpec(group.FieldID, field.TypeInt),
+			},
+		}
+		for _, k := range nodes {
+			edge.Target.Nodes = append(edge.Target.Nodes, k)
+		}
+		_spec.Edges.Add = append(_spec.Edges.Add, edge)
+	}
+	_node = &User{config: _u.config}
+	_spec.Assign = _node.assignValues
+	_spec.ScanValues = _node.scanValues
+	if err = sqlgraph.UpdateNode(ctx, _u.driver, _spec); err != nil {
+		if _, ok := err.(*sqlgraph.NotFoundError); ok {
+			err = &NotFoundError{user.Label}
+		} else if sqlgraph.IsConstraintError(err) {
+			err = &ConstraintError{msg: err.Error(), wrap: err}
+		}
+		return nil, err
+	}
+	_u.mutation.done = true
+	return _node, nil
+}

examples/traversal/example_test.go

@@ -0,0 +1,242 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+
+	"entgo.io/ent/examples/traversal/ent"
+	"entgo.io/ent/examples/traversal/ent/group"
+	"entgo.io/ent/examples/traversal/ent/pet"
+	"entgo.io/ent/examples/traversal/ent/user"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+func Example_traversal() {
+	client, err := ent.Open("sqlite3", "file:ent?mode=memory&cache=shared&_fk=1")
+	if err != nil {
+		log.Fatalf("failed opening connection to sqlite: %v", err)
+	}
+	defer client.Close()
+	ctx := context.Background()
+	// Run the auto migration tool.
+	if err := client.Schema.Create(ctx); err != nil {
+		log.Fatalf("failed creating schema resources: %v", err)
+	}
+	if err := Gen(ctx, client); err != nil {
+		log.Fatal(err)
+	}
+	if err := Traverse(ctx, client); err != nil {
+		log.Fatal(err)
+	}
+	if err := Traverse2(ctx, client); err != nil {
+		log.Fatal(err)
+	}
+	// Generate a group of entities in a transaction.
+	if err := GenTx(ctx, client); err != nil {
+		log.Fatal(err)
+	}
+	// Wrap an existing function ("Gen") in a transaction.
+	if err := WrapGen(ctx, client); err != nil {
+		log.Fatal(err)
+	}
+	// WithTx helper.
+	if err := WithTx(ctx, client, func(tx *ent.Tx) error {
+		return Gen(ctx, tx.Client())
+	}); err != nil {
+		log.Fatal(err)
+	}
+	// Output:
+	// Pets created: Pet(id=1, name=Pedro) Pet(id=2, name=Xabi) Pet(id=3, name=Coco)
+	// User(id=3, age=37, name=Alex)
+	// [Pet(id=1, name=Pedro) Pet(id=2, name=Xabi)]
+	// User(id=5, age=30, name=Ariel)
+	// Pets created: Pet(id=4, name=Pedro) Pet(id=5, name=Xabi) Pet(id=6, name=Coco)
+	// Pets created: Pet(id=7, name=Pedro) Pet(id=8, name=Xabi) Pet(id=9, name=Coco)
+}
+
+func Gen(ctx context.Context, client *ent.Client) error {
+	hub, err := client.Group.
+		Create().
+		SetName("Github").
+		Save(ctx)
+	if err != nil {
+		return fmt.Errorf("failed creating the group: %w", err)
+	}
+	// Create the admin of the group.
+	// Unlike `Save`, `SaveX` panics if an error occurs.
+	dan := client.User.
+		Create().
+		SetAge(29).
+		SetName("Dan").
+		AddManage(hub).
+		SaveX(ctx)
+
+	// Create "Ariel" and its pets.
+	a8m := client.User.
+		Create().
+		SetAge(30).
+		SetName("Ariel").
+		AddGroups(hub).
+		AddFriends(dan).
+		SaveX(ctx)
+	pedro := client.Pet.
+		Create().
+		SetName("Pedro").
+		SetOwner(a8m).
+		SaveX(ctx)
+	xabi := client.Pet.
+		Create().
+		SetName("Xabi").
+		SetOwner(a8m).
+		SaveX(ctx)
+
+	// Create "Alex" and its pets.
+	alex := client.User.
+		Create().
+		SetAge(37).
+		SetName("Alex").
+		SaveX(ctx)
+	coco := client.Pet.
+		Create().
+		SetName("Coco").
+		SetOwner(alex).
+		AddFriends(pedro).
+		SaveX(ctx)
+
+	fmt.Println("Pets created:", pedro, xabi, coco)
+	// Output:
+	// Pets created: Pet(id=1, name=Pedro) Pet(id=2, name=Xabi) Pet(id=3, name=Coco)
+	return nil
+}
+
+func Traverse(ctx context.Context, client *ent.Client) error {
+	owner, err := client.Group. // GroupClient.
+					Query().                     // Query builder.
+					Where(group.Name("Github")). // Filter only GitHub group (only 1).
+					QueryAdmin().                // Getting Dan.
+					QueryFriends().              // Getting Dan's friends: [Ariel].
+					QueryPets().                 // Their pets: [Pedro, Xabi].
+					QueryFriends().              // Pedro's friends: [Coco], Xabi's friends: [].
+					QueryOwner().                // Coco's owner: Alex.
+					Only(ctx)                    // Expect only one entity to return in the query.
+	if err != nil {
+		return fmt.Errorf("failed querying the owner: %w", err)
+	}
+	fmt.Println(owner)
+	// Output:
+	// User(id=3, age=37, name=Alex)
+	return nil
+}
+
+// Traverse2 example from the doc.
+func Traverse2(ctx context.Context, client *ent.Client) error {
+	pets, err := client.Pet.
+		Query().
+		Where(
+			pet.HasOwnerWith(
+				user.HasFriendsWith(
+					user.HasManage(),
+				),
+			),
+		).
+		All(ctx)
+	if err != nil {
+		return fmt.Errorf("failed querying the pets: %w", err)
+	}
+	fmt.Println(pets)
+	// Output:
+	// [Pet(id=1, name=Pedro) Pet(id=2, name=Xabi)]
+	return nil
+}
+
+// GenTx example from the doc.
+func GenTx(ctx context.Context, client *ent.Client) error {
+	tx, err := client.Tx(ctx)
+	if err != nil {
+		return fmt.Errorf("starting a transaction: %w", err)
+	}
+	hub, err := tx.Group.
+		Create().
+		SetName("Github").
+		Save(ctx)
+	if err != nil {
+		return rollback(tx, fmt.Errorf("failed creating the group: %w", err))
+	}
+	// Create the admin of the group.
+	dan, err := tx.User.
+		Create().
+		SetAge(29).
+		SetName("Dan").
+		AddManage(hub).
+		Save(ctx)
+	if err != nil {
+		return rollback(tx, err)
+	}
+	// Create user "Ariel".
+	a8m, err := tx.User.
+		Create().
+		SetAge(30).
+		SetName("Ariel").
+		AddGroups(hub).
+		AddFriends(dan).
+		Save(ctx)
+	if err != nil {
+		return rollback(tx, err)
+	}
+	fmt.Println(a8m)
+	// Output:
+	// User(id=1, age=30, name=Ariel)
+	return tx.Commit()
+}
+
+// WrapGen wraps the existing "Gen" function in a transaction.
+func WrapGen(ctx context.Context, client *ent.Client) error {
+	tx, err := client.Tx(ctx)
+	if err != nil {
+		return err
+	}
+	txClient := tx.Client()
+	// Use the same "Gen" as above, but give it the transactional client; no code changes to "Gen".
+	if err := Gen(ctx, txClient); err != nil {
+		return rollback(tx, err)
+	}
+	return tx.Commit()
+}
+
+// WithTx example from the doc.
+func WithTx(ctx context.Context, client *ent.Client, fn func(tx *ent.Tx) error) error {
+	tx, err := client.Tx(ctx)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if v := recover(); v != nil {
+			tx.Rollback()
+			panic(v)
+		}
+	}()
+	if err := fn(tx); err != nil {
+		if rerr := tx.Rollback(); rerr != nil {
+			err = fmt.Errorf("%w: rolling back transaction: %v", err, rerr)
+		}
+		return err
+	}
+	if err := tx.Commit(); err != nil {
+		return fmt.Errorf("committing transaction: %w", err)
+	}
+	return nil
+}
+
+// rollback calls to tx.Rollback and wraps the given error with the rollback error if occurred.
+func rollback(tx *ent.Tx, err error) error {
+	if rerr := tx.Rollback(); rerr != nil {
+		err = fmt.Errorf("%w: %v", err, rerr)
+	}
+	return err
+}