Support graphene-django-extensions nested ordering

pyproject.toml

@@ -291,6 +291,7 @@ omit = [
     "docs/*",
     ".venv/*",
     ".tox/*",
+    "example_project/*",
 ]
 exclude_lines = [
     "if TYPE_CHECKING:",

query_optimizer/optimizer.py

@@ -199,14 +199,7 @@ def paginate_prefetch_queryset(self, queryset: QuerySet, filter_info: GraphQLFil
         remote_field = field.remote_field
         field_name = remote_field.name if isinstance(field, models.ManyToManyField) else remote_field.attname
 
-        order_by: list[str] = (
-            # Use the `order_by` from the filter info, if available
-            [x for x in filter_info.get("filters", {}).get("order_by", "").split(",") if x]
-            # Use the model's `Meta.ordering` if no `order_by` is given
-            or copy(queryset.model._meta.ordering)
-            # No ordering if neither is available
-            or []
-        )
+        order_by = self.get_prefetch_ordering(filter_info, model=queryset.model)
 
         pagination_args = validate_pagination_args(
             after=filter_info.get("filters", {}).get("after"),
@@ -271,6 +264,26 @@ def paginate_prefetch_queryset(self, queryset: QuerySet, filter_info: GraphQLFil
             )
         )
 
+    def get_prefetch_ordering(self, filter_info: GraphQLFilterInfo, model: type[Model]) -> list[str]:
+        """Get the ordering for prefetch querysets."""
+        order_info: str | list[str] = filter_info.get("filters", {}).get("order_by", "")
+
+        # 'Graphene-django' uses a comma-separated string for ordering.
+        if isinstance(order_info, str):
+            order_info = order_info.split(",")
+        # 'Graphene-django-extensions' uses a list of enums.
+        elif isinstance(order_info, list):  # pragma: no cover
+            order_info = [str(x) for x in order_info]
+
+        return (
+            # Use the `order_by` from the filter info, if available
+            [x for x in order_info if x]
+            # Use the model's `Meta.ordering` if no `order_by` is given
+            or copy(model._meta.ordering)
+            # No ordering if neither is available
+            or []
+        )
+
     def filter_queryset(self, queryset: QuerySet, filter_info: GraphQLFilterInfo) -> QuerySet:
         """Run all filtering based on the object type matching the queryset's model."""
         # Run filtering hooks on object types if they exist.