[Extensibility] Support relation fields (#17056)

Closes https://github.com/twentyhq/core-team-issues/issues/2043

packages/twenty-shared/src/application/index.ts

@@ -15,6 +15,7 @@ export { DEFAULT_API_URL_NAME } from './constants/DefaultApiUrlName';
 export type { FieldManifest } from './fieldManifestType';
 export type { ObjectManifest } from './objectManifestType';
 export type { PackageJson } from './packageJsonType';
+export type { RelationFieldManifest } from './relationFieldManifestType';
 export type { RoleManifest } from './roleManifestType';
 export type {
   InputJsonSchema,

packages/twenty-shared/src/application/objectManifestType.ts

@@ -1,4 +1,5 @@
 import { type FieldManifest } from '@/application';
+import { type RelationFieldManifest } from '@/application/relationFieldManifestType';
 import { type SyncableEntityOptions } from '@/application/syncableEntityOptionsType';
 
 export type ObjectManifest = SyncableEntityOptions & {
@@ -8,5 +9,5 @@ export type ObjectManifest = SyncableEntityOptions & {
   labelPlural: string;
   description?: string;
   icon?: string;
-  fields: FieldManifest[];
+  fields: (FieldManifest | RelationFieldManifest)[];
 };

packages/twenty-shared/src/application/relationFieldManifestType.ts

@@ -0,0 +1,17 @@
+import { type SyncableEntityOptions } from '@/application/syncableEntityOptionsType';
+import { type FieldMetadataType } from '@/types';
+import { type RelationOnDeleteAction } from '@/types/RelationOnDeleteAction.type';
+import { type RelationType } from '@/types/RelationType';
+
+export type RelationFieldManifest = SyncableEntityOptions & {
+  name: string;
+  label: string;
+  description?: string;
+  icon?: string;
+  relationType: RelationType;
+  targetObjectUniversalIdentifier: string;
+  targetFieldLabel: string;
+  targetFieldIcon?: string;
+  onDelete?: RelationOnDeleteAction;
+  type: FieldMetadataType;
+};