FieldMetadataServiceV2.deleteOneField (#13744)

# Introduction
- Migrated the `deleteOneField` handler to new workspace migration v2
style
- Refactored the build to expect `flatObjectMetadataMaps` that he
instantly translate at the be beginning
Commented `ObjectMetadataServiceV2` as it's still not implemented
neither used

packages/twenty-server/src/engine/metadata-modules/flat-object-metadata-maps/constant/empty-flat-object-metadata-maps.constant.ts

@@ -0,0 +1,6 @@
+import { type FlatObjectMetadataMaps } from 'src/engine/metadata-modules/flat-object-metadata-maps/types/flat-object-metadata-maps.type';
+
+export const EMPTY_FLAT_OBJECT_METADATA_MAPS = {
+  byId: {},
+  idByNameSingular: {},
+} as const satisfies FlatObjectMetadataMaps;

packages/twenty-server/src/engine/metadata-modules/flat-object-metadata-maps/utils/extract-flat-object-metadata-maps-out-of-flat-object-metadata-maps-or-throw.util.ts

@@ -1,5 +1,6 @@
 import { isDefined } from 'twenty-shared/utils';
 
+import { EMPTY_FLAT_OBJECT_METADATA_MAPS } from 'src/engine/metadata-modules/flat-object-metadata-maps/constant/empty-flat-object-metadata-maps.constant';
 import {
   FlatObjectMetadataMapsException,
   FlatObjectMetadataMapsExceptionCode,
@@ -17,11 +18,6 @@ export const extractFlatObjectMetadataMapsOutOfFlatObjectMetadataMapsOrThrow =
     flatObjectMetadataMaps: sourceFlatObjectMetadataMaps,
     objectMetadataIds,
   }: ExtractFlatObjectMetadataMapsOutOfFlatObjectMetadataMapsOrThrowArgs): FlatObjectMetadataMaps => {
-    const emptyFlatObjectMetadataMaps: FlatObjectMetadataMaps = {
-      byId: {},
-      idByNameSingular: {},
-    };
-
     return objectMetadataIds.reduce(
       (flatObjectMetadataMaps, objectMetadataId) => {
         const flatObjectMetadataWithFlatFieldMaps =
@@ -41,6 +37,6 @@ export const extractFlatObjectMetadataMapsOutOfFlatObjectMetadataMapsOrThrow =
           },
         );
       },
-      emptyFlatObjectMetadataMaps,
+      EMPTY_FLAT_OBJECT_METADATA_MAPS,
     );
   };

packages/twenty-server/src/engine/metadata-modules/flat-object-metadata-maps/utils/find-flat-field-metadata-in-flat-object-metadata-maps-with-field-id-only.util.ts

@@ -0,0 +1,32 @@
+import { isDefined } from 'twenty-shared/utils';
+
+import { type FlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-metadata/types/flat-field-metadata.type';
+import { type FlatObjectMetadataMaps } from 'src/engine/metadata-modules/flat-object-metadata-maps/types/flat-object-metadata-maps.type';
+
+export type FindFlatFieldMetadataInFlatObjectMetadataMapsWithOnlyFieldIdArgs = {
+  fieldMetadataId: string;
+  flatObjectMetadataMaps: FlatObjectMetadataMaps;
+};
+// TODO add tests
+export const findFlatFieldMetadataInFlatObjectMetadataMapsWithOnlyFieldId = ({
+  flatObjectMetadataMaps,
+  fieldMetadataId,
+}: FindFlatFieldMetadataInFlatObjectMetadataMapsWithOnlyFieldIdArgs):
+  | FlatFieldMetadata
+  | undefined => {
+  const flatObjectMetadataWithFlatFieldMapsArray = Object.values(
+    flatObjectMetadataMaps.byId,
+  ).filter(isDefined);
+
+  const matchingFlatObjectMetadataWithFlatFieldMaps =
+    flatObjectMetadataWithFlatFieldMapsArray.find(
+      (flatObjectMetadataWithFlatFieldMaps) =>
+        isDefined(
+          flatObjectMetadataWithFlatFieldMaps.fieldsById[fieldMetadataId],
+        ),
+    );
+
+  return matchingFlatObjectMetadataWithFlatFieldMaps?.fieldsById[
+    fieldMetadataId
+  ];
+};