morph fix for release 1.4 (#14029)

DataLoader Specific update du to Morph relations that have many rows

Fixes https://github.com/twentyhq/twenty/issues/14018

packages/twenty-server/src/engine/dataloaders/dataloader.service.ts

@@ -250,7 +250,9 @@ export class DataloaderService {
             });
           });
 
-          return filterMorphRelationDuplicateFieldsDTO(fields);
+          return filterMorphRelationDuplicateFieldsDTO<FieldMetadataDTO>(
+            fields,
+          );
         });
 
         return fieldMetadataCollection;

packages/twenty-server/src/engine/dataloaders/utils/filter-morph-relation-duplicate-fields.util.ts

@@ -1,7 +1,7 @@
-import { type FieldMetadataDTO } from 'src/engine/metadata-modules/field-metadata/dtos/field-metadata.dto';
-
-export const filterMorphRelationDuplicateFieldsDTO = (
-  fields: FieldMetadataDTO[],
+export const filterMorphRelationDuplicateFieldsDTO = <
+  T extends { name: string; id: string },
+>(
+  fields: T[],
 ) => {
   return fields.filter((currentField) => {
     return !fields.some(

packages/twenty-server/src/engine/metadata-modules/field-metadata/services/field-metadata-relation.service.ts

@@ -10,6 +10,7 @@ import { v4 } from 'uuid';
 import { type FieldMetadataSettings } from 'src/engine/metadata-modules/field-metadata/interfaces/field-metadata-settings.interface';
 import { RelationType } from 'src/engine/metadata-modules/field-metadata/interfaces/relation-type.interface';
 
+import { filterMorphRelationDuplicateFieldsDTO } from 'src/engine/dataloaders/utils/filter-morph-relation-duplicate-fields.util';
 import { type CreateFieldInput } from 'src/engine/metadata-modules/field-metadata/dtos/create-field.input';
 import { type UpdateFieldInput } from 'src/engine/metadata-modules/field-metadata/dtos/update-field.input';
 import { type FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
@@ -18,6 +19,7 @@ import {
   FieldMetadataExceptionCode,
 } from 'src/engine/metadata-modules/field-metadata/field-metadata.exception';
 import { computeRelationFieldJoinColumnName } from 'src/engine/metadata-modules/field-metadata/utils/compute-relation-field-join-column-name.util';
+import { isFieldMetadataTypeMorphRelation } from 'src/engine/metadata-modules/field-metadata/utils/is-field-metadata-type-morph-relation.util';
 import { prepareCustomFieldMetadataForCreation } from 'src/engine/metadata-modules/field-metadata/utils/prepare-field-metadata-for-creation.util';
 import { validateRelationCreationPayloadOrThrow } from 'src/engine/metadata-modules/field-metadata/utils/validate-relation-creation-payload-or-throw.util';
 import { type ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
@@ -272,6 +274,37 @@ export class FieldMetadataRelationService {
         );
       }
 
+      // Morph relation specific:
+      // to keep the fieldMetadata API simple
+      // we decided to override the targetFieldMetadata with the existing one
+      // in case the relation target is a morph relation
+      const isRelationTargetMorphRelation =
+        isFieldMetadataTypeMorphRelation(targetFieldMetadata);
+
+      const targetObjectMetadataFields = Object.values(
+        targetObjectMetadata.fieldsById,
+      );
+
+      const targetObjectMetadataWithoutDuplicates =
+        filterMorphRelationDuplicateFieldsDTO<FieldMetadataEntity>(
+          targetObjectMetadataFields,
+        );
+      const targetFieldMetadataSelected =
+        targetObjectMetadataWithoutDuplicates.find(
+          (fieldMetadata) => fieldMetadata.name === targetFieldMetadata.name,
+        );
+
+      if (!isDefined(targetFieldMetadataSelected)) {
+        throw new FieldMetadataException(
+          `Target field metadata not found for field metadata ${id}`,
+          FieldMetadataExceptionCode.FIELD_METADATA_RELATION_MALFORMED,
+        );
+      }
+
+      const targetFieldMetadataOverride = isRelationTargetMorphRelation
+        ? targetFieldMetadataSelected
+        : targetFieldMetadata;
+
       return {
         sourceObjectMetadata:
           getObjectMetadataFromObjectMetadataItemWithFieldMaps(
@@ -282,7 +315,7 @@ export class FieldMetadataRelationService {
           getObjectMetadataFromObjectMetadataItemWithFieldMaps(
             targetObjectMetadata,
           ) as ObjectMetadataEntity,
-        targetFieldMetadata: targetFieldMetadata as FieldMetadataEntity,
+        targetFieldMetadata: targetFieldMetadataOverride as FieldMetadataEntity,
       };
     });
   }