Ticket #7342: 7342-r7568.diff

django/db/models/options.py

@@ -56 +56 @@
         # Next, apply any overridden values from 'class Meta'.
         if self.meta:
             meta_attrs = self.meta.__dict__.copy()
-            del meta_attrs['__module__']
-            del meta_attrs['__doc__']
+            for name in self.meta.__dict__:
+                # Ignore any private attributes that Django doesn't care about.
+                # NOTE: We can't modify a dictionary's contents while looping
+                # over it, so we loop over the *original* dictionary instead.
+                if name.startswith('_'):
+                    del meta_attrs[name]
             for attr_name in DEFAULT_NAMES:
                 if attr_name in meta_attrs:
                     setattr(self, attr_name, meta_attrs.pop(attr_name))