Handle relations between same objects (#4137)

* Handle relations between same objects

* Simplify conditions

---------

Co-authored-by: Thomas Trompette <thomast@twenty.com>

packages/twenty-server/src/workspace/utils/__tests__/deduce-relation-direction.spec.ts

@@ -1,5 +1,7 @@
+import { FieldMetadataInterface } from 'src/metadata/field-metadata/interfaces/field-metadata.interface';
 import { RelationMetadataInterface } from 'src/metadata/field-metadata/interfaces/relation-metadata.interface';
 
+import { FieldMetadataType } from 'src/metadata/field-metadata/field-metadata.entity';
 import { RelationMetadataType } from 'src/metadata/relation-metadata/relation-metadata.entity';
 import {
   deduceRelationDirection,
@@ -7,39 +9,61 @@ import {
 } from 'src/workspace/utils/deduce-relation-direction.util';
 
 describe('deduceRelationDirection', () => {
-  it('should return FROM when the current object Metadata ID matches fromObjectMetadataId', () => {
-    const currentObjectId = 'from_object_id';
+  it('should return FROM when the current object Metadata ID matches fromObjectMetadataId and id matches fromFieldMetadataId', () => {
+    const fieldMetadata: FieldMetadataInterface = {
+      id: 'field_id',
+      objectMetadataId: 'from_object_id',
+      type: FieldMetadataType.RELATION,
+      name: 'field_name',
+      label: 'Field Name',
+      description: 'Field Description',
+      targetColumnMap: {
+        default: 'default_column',
+      },
+    };
+
     const relationMetadata = {
       id: 'relation_id',
-      fromObjectMetadataId: currentObjectId,
+      fromObjectMetadataId: fieldMetadata.objectMetadataId,
       toObjectMetadataId: 'to_object_id',
-      fromFieldMetadataId: 'from_field_id',
+      fromFieldMetadataId: fieldMetadata.id,
       toFieldMetadataId: 'to_field_id',
       relationType: RelationMetadataType.ONE_TO_ONE,
     };
 
     const result = deduceRelationDirection(
-      currentObjectId,
+      fieldMetadata,
       relationMetadata as RelationMetadataInterface,
     );
 
     expect(result).toBe(RelationDirection.FROM);
   });
 
-  it('should return TO when the current object Metadata ID matches toObjectMetadataId', () => {
+  it('should return TO when the current object Metadata ID matches toObjectMetadataId and id matches toFieldMetadataId', () => {
     // Arrange
-    const currentObjectId = 'to_object_id';
+    const fieldMetadata: FieldMetadataInterface = {
+      id: 'field_id',
+      objectMetadataId: 'to_object_id',
+      type: FieldMetadataType.RELATION,
+      name: 'field_name',
+      label: 'Field Name',
+      description: 'Field Description',
+      targetColumnMap: {
+        default: 'default_column',
+      },
+    };
+
     const relationMetadata = {
       id: 'relation_id',
       fromObjectMetadataId: 'from_object_id',
-      toObjectMetadataId: currentObjectId,
+      toObjectMetadataId: fieldMetadata.objectMetadataId,
       fromFieldMetadataId: 'from_field_id',
-      toFieldMetadataId: 'to_field_id',
+      toFieldMetadataId: fieldMetadata.id,
       relationType: RelationMetadataType.ONE_TO_ONE,
     };
 
     const result = deduceRelationDirection(
-      currentObjectId,
+      fieldMetadata,
       relationMetadata as RelationMetadataInterface,
     );
 
@@ -47,7 +71,18 @@ describe('deduceRelationDirection', () => {
   });
 
   it('should throw an error when the current object Metadata ID does not match any object metadata ID', () => {
-    const currentObjectId = 'unrelated_object_id';
+    const fieldMetadata: FieldMetadataInterface = {
+      id: 'field_id',
+      objectMetadataId: 'unrelated_object_id',
+      type: FieldMetadataType.RELATION,
+      name: 'field_name',
+      label: 'Field Name',
+      description: 'Field Description',
+      targetColumnMap: {
+        default: 'default_column',
+      },
+    };
+
     const relationMetadata = {
       id: 'relation_id',
       fromObjectMetadataId: 'from_object_id',
@@ -59,11 +94,11 @@ describe('deduceRelationDirection', () => {
 
     expect(() =>
       deduceRelationDirection(
-        currentObjectId,
+        fieldMetadata,
         relationMetadata as RelationMetadataInterface,
       ),
     ).toThrow(
-      `Relation metadata ${relationMetadata.id} is not related to object ${currentObjectId}`,
+      `Relation metadata ${relationMetadata.id} is not related to object ${fieldMetadata.objectMetadataId}`,
     );
   });
 });

packages/twenty-server/src/workspace/utils/deduce-relation-direction.util.ts

@@ -1,3 +1,4 @@
+import { FieldMetadataInterface } from 'src/metadata/field-metadata/interfaces/field-metadata.interface';
 import { RelationMetadataInterface } from 'src/metadata/field-metadata/interfaces/relation-metadata.interface';
 
 export enum RelationDirection {
@@ -6,18 +7,24 @@ export enum RelationDirection {
 }
 
 export const deduceRelationDirection = (
-  currentObjectId: string,
+  fieldMetadata: FieldMetadataInterface,
   relationMetadata: RelationMetadataInterface,
 ): RelationDirection => {
-  if (relationMetadata.fromObjectMetadataId === currentObjectId) {
+  if (
+    relationMetadata.fromObjectMetadataId === fieldMetadata.objectMetadataId &&
+    relationMetadata.fromFieldMetadataId === fieldMetadata.id
+  ) {
     return RelationDirection.FROM;
   }
 
-  if (relationMetadata.toObjectMetadataId === currentObjectId) {
+  if (
+    relationMetadata.toObjectMetadataId === fieldMetadata.objectMetadataId &&
+    relationMetadata.toFieldMetadataId === fieldMetadata.id
+  ) {
     return RelationDirection.TO;
   }
 
   throw new Error(
-    `Relation metadata ${relationMetadata.id} is not related to object ${currentObjectId}`,
+    `Relation metadata ${relationMetadata.id} is not related to object ${fieldMetadata.objectMetadataId}`,
   );
 };

packages/twenty-server/src/workspace/workspace-health/services/relation-metadata.health.service.ts

@@ -55,7 +55,7 @@ export class RelationMetadataHealthService {
       }
 
       const relationDirection = deduceRelationDirection(
-        objectMetadata.id,
+        fieldMetadata,
         relationMetadata,
       );
 

packages/twenty-server/src/workspace/workspace-query-builder/factories/relation-field-alias.factory.ts

@@ -72,7 +72,7 @@ export class RelationFieldAliasFactory {
     }
 
     const relationDirection = deduceRelationDirection(
-      fieldMetadata.objectMetadataId,
+      fieldMetadata,
       relationMetadata,
     );
     // Retrieve the referenced object metadata based on the relation direction

packages/twenty-server/src/workspace/workspace-schema-builder/factories/extend-object-type-definition.factory.ts

@@ -128,7 +128,7 @@ export class ExtendObjectTypeDefinitionFactory {
       }
 
       const relationDirection = deduceRelationDirection(
-        fieldMetadata.objectMetadataId,
+        fieldMetadata,
         relationMetadata,
       );
       const relationType = this.relationTypeFactory.create(