fixup! feat: extract overridable permission methods from ObjectTagView

Author: wgu-taylor-payne

src/openedx_tagging/rest_api/v1/views.py

@@ -450,6 +450,8 @@ class ObjectTagView(
     serializer_class = ObjectTagSerializer
     # Serializer used in the result in `to_representation` in `ObjectTagsByTaxonomySerializer`
     minimal_serializer_class = ObjectTagMinimalSerializer
+    # Serializer used in `retrieve` to group object tags by taxonomy
+    taxonomy_serializer_class = ObjectTagsByTaxonomySerializer
     permission_classes = [ObjectTagObjectPermissions]
     lookup_field = "object_id"
     lookup_value_regex = r'[\w\.\+\-@:]+'
@@ -524,7 +526,7 @@ def retrieve(self, request, *args, **kwargs) -> Response:
         behavior we want.
         """
         object_tags = self.filter_queryset(self.get_queryset())
-        serializer = ObjectTagsByTaxonomySerializer(list(object_tags), context=self.get_serializer_context())
+        serializer = self.taxonomy_serializer_class(list(object_tags), context=self.get_serializer_context())
         response_data = serializer.data
         if self.kwargs["object_id"] not in response_data:
             # For consistency, the key with the object_id should always be present in the response, even if there