fix: enforce the user to pass in property with id suffix for morph relations in Rest API (#18335)

REST API allowed users to pass in targetOpportunity, targetPerson,
targetCompany etc when trying to create a noteTarget or a taskTarget.
The request went through, we got back a 201, the record was created, but
the relationship was never established since the FK was empty in the
database.

This PR enforces users to send in the property with the `Id` suffix for
consistency. So, the user sends in targetOpportunityId, targetPersonId,
targetCompanyId etc.

<p align="center">
<img width="854" height="480" alt="image"
src="https://github.com/user-attachments/assets/ed50a623-68d4-4266-baf1-e94a657c3fd4"
/>
</p>

If the users try to send without the "Id" suffix, they get an error
explaining what to do.

<p align="center">
<img width="854" height="480" alt="image"
src="https://github.com/user-attachments/assets/8bab399b-7a04-4b6a-86b5-6f0e0b1ecd5d"
/>
</p>

Additionally, the documentation itself contains the correct property
names.

<p align="center">
<img width="854" height="480" alt="image"
src="https://github.com/user-attachments/assets/83e51cd6-8ef7-4a4d-8696-ab37cc4a9dd6"
/>
</p>

Finally, the filters also enforce this "Id" suffix convention in the GET
request.

<p align="center">
<img width="854" height="480" alt="image"
src="https://github.com/user-attachments/assets/168a2f09-1242-40fa-bd84-1f7d9c60357c"
/>
</p>

Edit: Updated error messages after the screenshots were taken to make
them a little generic. Secondly, this PR also fixes the issue of morph
relation ids and objects not appearing in the response (when depth is
1).

packages/twenty-server/src/engine/api/common/common-select-fields/utils/__tests__/get-all-selectable-fields.util.spec.ts

@@ -523,7 +523,7 @@ describe('getAllSelectableFields', () => {
       });
     });
 
-    it('should include MANY_TO_ONE relations without joinColumnName as regular fields', () => {
+    it('should compute join column name for MANY_TO_ONE relations without joinColumnName in settings', () => {
       const nameField = createMockField({
         id: 'field-1',
         name: 'name',
@@ -555,7 +555,7 @@ describe('getAllSelectableFields', () => {
 
       expect(result).toEqual({
         name: true,
-        company: true, // MANY_TO_ONE without joinColumnName are included as regular fields
+        companyId: true,
       });
     });
   });

packages/twenty-server/src/engine/api/common/common-select-fields/utils/get-all-selectable-fields.util.ts

@@ -8,9 +8,9 @@ import {
   type RestrictedFieldsPermissions,
   compositeTypeDefinitions,
 } from 'twenty-shared/types';
-import { isDefined } from 'twenty-shared/utils';
 
 import { isCompositeFieldMetadataType } from 'src/engine/metadata-modules/field-metadata/utils/is-composite-field-metadata-type.util';
+import { computeMorphOrRelationFieldJoinColumnName } from 'src/engine/metadata-modules/field-metadata/utils/compute-morph-or-relation-field-join-column-name.util';
 import { type FlatEntityMaps } from 'src/engine/metadata-modules/flat-entity/types/flat-entity-maps.type';
 import { findFlatEntityByIdInFlatEntityMapsOrThrow } from 'src/engine/metadata-modules/flat-entity/utils/find-flat-entity-by-id-in-flat-entity-maps-or-throw.util';
 import { type FlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-metadata/types/flat-field-metadata.type';
@@ -80,11 +80,18 @@ export const getAllSelectableFields = ({
 
       result[flatField.name] = compositeFields;
     } else if (
-      isFlatFieldMetadataOfType(flatField, FieldMetadataType.RELATION) &&
-      flatField.settings.relationType === RelationType.MANY_TO_ONE &&
-      isDefined(flatField.settings.joinColumnName)
+      (isFlatFieldMetadataOfType(flatField, FieldMetadataType.RELATION) ||
+        isFlatFieldMetadataOfType(
+          flatField,
+          FieldMetadataType.MORPH_RELATION,
+        )) &&
+      flatField.settings.relationType === RelationType.MANY_TO_ONE
     ) {
-      result[flatField.settings.joinColumnName] = true;
+      const joinColumnName = computeMorphOrRelationFieldJoinColumnName({
+        name: flatField.name,
+      });
+
+      result[joinColumnName] = true;
     } else {
       result[flatField.name] = true;
     }