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

examples/o2mrecur/ent/mutation.go

@@ -0,0 +1,181 @@
+// 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/o2mrecur/ent/node"
+)
+
+const (
+	// Operation types.
+	OpCreate    = ent.OpCreate
+	OpDelete    = ent.OpDelete
+	OpDeleteOne = ent.OpDeleteOne
+	OpUpdate    = ent.OpUpdate
+	OpUpdateOne = ent.OpUpdateOne
+
+	// Node types.
+	TypeNode = "Node"
+)
+
+// NodeMutation represents an operation that mutates the Node nodes in the graph.
+type NodeMutation struct {
+	node.Mutation
+	config
+	id       *int
+	done     bool
+	oldValue func(context.Context) (*Node, error)
+}
+
+var _ ent.Mutation = (*NodeMutation)(nil)
+
+// nodeOption allows management of the mutation configuration using functional options.
+type nodeOption func(*NodeMutation)
+
+// newNodeMutation creates new mutation for the Node entity.
+func newNodeMutation(c config, op Op, opts ...nodeOption) *NodeMutation {
+	m := &NodeMutation{
+		Mutation: *node.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 *NodeMutation) ID() (id int, exists bool) {
+	if m.id == nil {
+		return
+	}
+	return *m.id, true
+}
+
+// withNodeID sets the ID field of the mutation.
+func withNodeID(id int) nodeOption {
+	return func(m *NodeMutation) {
+		var (
+			err   error
+			once  sync.Once
+			value *Node
+		)
+		m.oldValue = func(ctx context.Context) (*Node, error) {
+			once.Do(func() {
+				if m.done {
+					err = errors.New("querying old values post mutation is not allowed")
+				} else {
+					value, err = m.Client().Node.Get(ctx, id)
+				}
+			})
+			return value, err
+		}
+		m.id = &id
+	}
+}
+
+// withNode sets the old Node of the mutation.
+func withNode(node *Node) nodeOption {
+	return func(m *NodeMutation) {
+		m.oldValue = func(context.Context) (*Node, 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 NodeMutation) 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 NodeMutation) 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 *NodeMutation) 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().Node.Query().Where(m.Predicates()...).IDs(ctx)
+	default:
+		return nil, fmt.Errorf("IDs is not allowed on %s operations", m.Op())
+	}
+}
+
+// OldValue returns the old "value" field's value of the Node entity.
+// If the Node 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 *NodeMutation) OldValue(ctx context.Context) (v int, err error) {
+	if !m.Op().Is(OpUpdateOne) {
+		return v, errors.New("OldValue is only allowed on UpdateOne operations")
+	}
+	if _, exists := m.ID(); !exists || m.oldValue == nil {
+		return v, errors.New("OldValue requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldValue: %w", err)
+	}
+	return oldValue.Value, nil
+}
+
+// OldParentID returns the old "parent_id" field's value of the Node entity.
+// If the Node 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 *NodeMutation) OldParentID(ctx context.Context) (v int, err error) {
+	if !m.Op().Is(OpUpdateOne) {
+		return v, errors.New("OldParentID is only allowed on UpdateOne operations")
+	}
+	if _, exists := m.ID(); !exists || m.oldValue == nil {
+		return v, errors.New("OldParentID requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldParentID: %w", err)
+	}
+	return oldValue.ParentID, 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 *NodeMutation) OldField(ctx context.Context, name string) (ent.Value, error) {
+	switch name {
+	case node.FieldValue:
+		return m.OldValue(ctx)
+	case node.FieldParentID:
+		return m.OldParentID(ctx)
+	}
+	return nil, fmt.Errorf("unknown Node field %s", name)
+}