Ordering fix

Author: rohitvinnakota-codecov

graphql_api/helpers/connection.py

@@ -208,18 +208,27 @@ class DictCursorPaginator(CursorPaginator):
     def position_from_instance(self, instance):
         position = []
         for order in self.ordering:
-            parts = order.lstrip("-").split("__")
+            desc = order.startswith("-")
+            key = order.lstrip("-")
+            parts = key.split("__")
             attr = instance
-            while parts:
+            for part in parts:
                 try:
-                    attr = getattr(attr, parts[0])
-                except AttributeError as attr_err:
+                    attr = getattr(attr, part)
+                except AttributeError as e:
                     try:
-                        attr = attr[parts[0]]
+                        attr = attr[part]
                     except (KeyError, TypeError):
-                        raise attr_err from None
-                parts.pop(0)
-            position.append(str(attr))
+                        raise e from None
+
+            is_null = attr is None
+            if is_null:
+                # Make sure None sorts after everything else
+                sortable_value = (1, "")
+            else:
+                sortable_value = (0, attr)
+
+            position.append(sortable_value if not desc else ("DESC", sortable_value))
         return position