Ticket #16458: 16458_admin_fix.diff

django/contrib/admin/util.py

@@ -133 +133 @@
         return qs.select_related(related.field.name)
 
     def _nested(self, obj, seen, format_callback):
-        if obj in seen:
+        if (obj.__class__, obj) in seen:
             return []
-        seen.add(obj)
+        seen.add((obj.__class__, obj))
         children = []
         for child in self.edges.get(obj, ()):
             children.extend(self._nested(child, seen, format_callback))