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---
title: Vztahy
description: Propojte objekty obousměrnými relacemi MANY_TO_ONE / ONE_TO_MANY.
icon: diagram-project
---
Relace propojují dva objekty. Ve Twenty jsou relace vždy **obousměrné** — každá relace má dvě strany a každá strana je deklarována jako pole, které odkazuje na tu druhou.
| Typ vztahu | Popis | Má cizí klíč? |
| ------------- | --------------------------------------------------------------------- | ---------------------- |
| `MANY_TO_ONE` | Mnoho záznamů tohoto objektu ukazuje na jeden záznam cílového objektu | Ano (`joinColumnName`) |
| `ONE_TO_MANY` | Jeden záznam tohoto objektu má mnoho záznamů cílového objektu | Ne (inverzní strana) |
## Jak fungují relace
Každá relace vyžaduje dvě pole, která na sebe vzájemně odkazují:
1. Strana MANY_TO_ONE — je na objektu, který drží cizí klíč.
2. Strana ONE_TO_MANY — je na objektu, který vlastní kolekci.
Obě pole používají `FieldType.RELATION` a vzájemně se odkazují prostřednictvím `relationTargetFieldMetadataUniversalIdentifier`.
## Příklad: Pohlednice má mnoho příjemců
`PostCard` lze odeslat mnoha záznamům `PostCardRecipient`. Každý příjemce náleží přesně jedné pohlednici.
**Krok 1: Definujte stranu ONE_TO_MANY na PostCard** (strana "one"):
```ts src/fields/post-card-recipients-on-post-card.field.ts
import { defineField, FieldType, RelationType } from 'twenty-sdk/define';
import { POST_CARD_UNIVERSAL_IDENTIFIER } from '../objects/post-card.object';
import { POST_CARD_RECIPIENT_UNIVERSAL_IDENTIFIER } from '../objects/post-card-recipient.object';
// Export so the other side can reference it
export const POST_CARD_RECIPIENTS_FIELD_ID = 'a1111111-1111-1111-1111-111111111111';
// Import from the other side
import { POST_CARD_FIELD_ID } from './post-card-on-post-card-recipient.field';
export default defineField({
universalIdentifier: POST_CARD_RECIPIENTS_FIELD_ID,
objectUniversalIdentifier: POST_CARD_UNIVERSAL_IDENTIFIER,
type: FieldType.RELATION,
name: 'postCardRecipients',
label: 'Post Card Recipients',
icon: 'IconUsers',
relationTargetObjectMetadataUniversalIdentifier: POST_CARD_RECIPIENT_UNIVERSAL_IDENTIFIER,
relationTargetFieldMetadataUniversalIdentifier: POST_CARD_FIELD_ID,
universalSettings: {
relationType: RelationType.ONE_TO_MANY,
},
});
```
**Krok 2: Definujte stranu MANY_TO_ONE na PostCardRecipient** (strana "many" — drží cizí klíč):
```ts src/fields/post-card-on-post-card-recipient.field.ts
import { defineField, FieldType, RelationType, OnDeleteAction } from 'twenty-sdk/define';
import { POST_CARD_UNIVERSAL_IDENTIFIER } from '../objects/post-card.object';
import { POST_CARD_RECIPIENT_UNIVERSAL_IDENTIFIER } from '../objects/post-card-recipient.object';
// Export so the other side can reference it
export const POST_CARD_FIELD_ID = 'b2222222-2222-2222-2222-222222222222';
// Import from the other side
import { POST_CARD_RECIPIENTS_FIELD_ID } from './post-card-recipients-on-post-card.field';
export default defineField({
universalIdentifier: POST_CARD_FIELD_ID,
objectUniversalIdentifier: POST_CARD_RECIPIENT_UNIVERSAL_IDENTIFIER,
type: FieldType.RELATION,
name: 'postCard',
label: 'Post Card',
icon: 'IconMail',
relationTargetObjectMetadataUniversalIdentifier: POST_CARD_UNIVERSAL_IDENTIFIER,
relationTargetFieldMetadataUniversalIdentifier: POST_CARD_RECIPIENTS_FIELD_ID,
universalSettings: {
relationType: RelationType.MANY_TO_ONE,
onDelete: OnDeleteAction.CASCADE,
joinColumnName: 'postCardId',
},
});
```
<Note>
**Cyklické importy:** obě relační pole odkazují na `universalIdentifier` toho druhého. Abyste předešli problémům s cyklickými importy, exportujte ID polí jako pojmenované konstanty z každého souboru a v druhém je importujte. Build systém je vyřeší v době kompilace.
</Note>
## Propojovací vztahy
Propojovací objekt spojuje jeden zdrojový záznam s jedním nebo více cílovými záznamy. Například `PostCardRecipient` může obsahovat vztah `postCard` i vztah `recipient`. V poli `ONE_TO_MANY` zdrojového objektu nastavte `junctionTargetFieldUniversalIdentifier` na pole vztahu v propojovacím objektu, které ukazuje na cíl:
```ts
export default defineField({
universalIdentifier: POST_CARD_RECIPIENTS_FIELD_ID,
objectUniversalIdentifier: POST_CARD_UNIVERSAL_IDENTIFIER,
type: FieldType.RELATION,
name: 'postCardRecipients',
label: 'Post Card Recipients',
relationTargetObjectMetadataUniversalIdentifier:
POST_CARD_RECIPIENT_UNIVERSAL_IDENTIFIER,
relationTargetFieldMetadataUniversalIdentifier: POST_CARD_FIELD_ID,
universalSettings: {
relationType: RelationType.ONE_TO_MANY,
junctionTargetFieldUniversalIdentifier: RECIPIENT_FIELD_ID,
},
});
```
`RECIPIENT_FIELD_ID` musí identifikovat vztah `MANY_TO_ONE` nebo morfní vztah v propojovacím objektu. Systému Twenty udává, který související záznam je cílem, když funkce, jako je [rozvětvení aktivity časové osy](/l/cs/developers/extend/apps/data/timeline-activity-types#automatic-and-explicit-events), prochází propojovacím objektem.
## Vazby na standardní objekty
Chcete-li vytvořit relaci s vestavěným objektem Twenty (Person, Company atd.), použijte `STANDARD_OBJECT_UNIVERSAL_IDENTIFIERS`:
```ts src/fields/person-on-self-hosting-user.field.ts
import {
defineField,
FieldType,
RelationType,
OnDeleteAction,
STANDARD_OBJECT_UNIVERSAL_IDENTIFIERS,
} from 'twenty-sdk/define';
import { SELF_HOSTING_USER_UNIVERSAL_IDENTIFIER } from '../objects/self-hosting-user.object';
export const PERSON_FIELD_ID = 'c3333333-3333-3333-3333-333333333333';
export const SELF_HOSTING_USER_REVERSE_FIELD_ID = 'd4444444-4444-4444-4444-444444444444';
export default defineField({
universalIdentifier: PERSON_FIELD_ID,
objectUniversalIdentifier: SELF_HOSTING_USER_UNIVERSAL_IDENTIFIER,
type: FieldType.RELATION,
name: 'person',
label: 'Person',
description: 'Person matching with the self hosting user',
isNullable: true,
relationTargetObjectMetadataUniversalIdentifier:
STANDARD_OBJECT_UNIVERSAL_IDENTIFIERS.person.universalIdentifier,
relationTargetFieldMetadataUniversalIdentifier: SELF_HOSTING_USER_REVERSE_FIELD_ID,
universalSettings: {
relationType: RelationType.MANY_TO_ONE,
onDelete: OnDeleteAction.SET_NULL,
joinColumnName: 'personId',
},
});
```
## Vlastnosti relačních polí
| Vlastnost | Povinné | Popis |
| ---------------------------------------------------------- | --------------------------------- | ------------------------------------------------------------------------------------------------- |
| `type` | Ano | Musí být `FieldType.RELATION` |
| `relationTargetObjectMetadataUniversalIdentifier` | Ano | `universalIdentifier` cílového objektu |
| `relationTargetFieldMetadataUniversalIdentifier` | Ano | `universalIdentifier` odpovídajícího pole na cílovém objektu |
| `universalSettings.relationType` | Ano | `RelationType.MANY_TO_ONE` nebo `RelationType.ONE_TO_MANY` |
| `universalSettings.onDelete` | Pouze MANY_TO_ONE | Co se stane, když je smazán odkazovaný záznam: `CASCADE`, `SET_NULL`, `RESTRICT` nebo `NO_ACTION` |
| `universalSettings.joinColumnName` | Pouze MANY_TO_ONE | Název databázového sloupce pro cizí klíč (např. `postCardId`) |
| `universalSettings.junctionTargetFieldUniversalIdentifier` | Pouze pro propojovací ONE_TO_MANY | Pole vztahu v propojovacím objektu, které ukazuje na cíl rozvětvení |
## Vložená relační pole
Relaci můžete také deklarovat přímo uvnitř [`defineObject`](/l/cs/developers/extend/apps/data/objects). Pokud je pole vložené, vynechejte `objectUniversalIdentifier` — dědí se z nadřazeného objektu:
```ts
export default defineObject({
universalIdentifier: '...',
nameSingular: 'postCardRecipient',
// ...
fields: [
{
universalIdentifier: POST_CARD_FIELD_ID,
type: FieldType.RELATION,
name: 'postCard',
label: 'Post Card',
relationTargetObjectMetadataUniversalIdentifier: POST_CARD_UNIVERSAL_IDENTIFIER,
relationTargetFieldMetadataUniversalIdentifier: POST_CARD_RECIPIENTS_FIELD_ID,
universalSettings: {
relationType: RelationType.MANY_TO_ONE,
onDelete: OnDeleteAction.CASCADE,
joinColumnName: 'postCardId',
},
},
// … other fields
],
});
```