feat: display identifier field in Object Detail page for custom objects (#3329)

* feat: display identifier field in Object Detail page for custom objects

Closes #3301

* fix: show Name as object label identifier by default

* Minor improvements

---------

Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-front/src/modules/settings/data-model/utils/getFieldIdentifierType.ts

@@ -0,0 +1,28 @@
+import { FieldMetadataItem } from '@/object-metadata/types/FieldMetadataItem';
+import { ObjectMetadataItem } from '@/object-metadata/types/ObjectMetadataItem';
+import { isLabelIdentifierField } from '@/object-metadata/utils/isLabelIdentifierField';
+import { FieldIdentifierType } from '@/settings/data-model/types/FieldIdentifierType';
+
+export const getFieldIdentifierType = (
+  activeFieldMetadatItem: FieldMetadataItem,
+  activeObjectMetadataItem: ObjectMetadataItem,
+): FieldIdentifierType | undefined => {
+  const fieldIsLabelIdentifier = isLabelIdentifierField({
+    fieldMetadataItem: activeFieldMetadatItem,
+    objectMetadataItem: activeObjectMetadataItem,
+  });
+
+  if (fieldIsLabelIdentifier) {
+    return 'label';
+  }
+
+  const fieldIsImageIdentifier =
+    activeObjectMetadataItem.imageIdentifierFieldMetadataId ===
+    activeFieldMetadatItem.id;
+
+  if (fieldIsImageIdentifier) {
+    return 'image';
+  }
+
+  return undefined;
+};