Ticket #11448: patch.diff

options.py

@@ -295 +295 @@
                 cache = self.init_name_map()
                 return cache[name]
         except KeyError:
-            raise FieldDoesNotExist('%s has no field named %r'
+            try:
+                #Try to rebuild the cache and get the value again
+                self._fill_fields_cache()
+                self._fill_m2m_cache()
+                self._fill_related_objects_cache()
+                self._fill_related_many_to_many_cache()
+                cache = self.init_name_map()
+                return cache[name]
+            except KeyError:
+                raise FieldDoesNotExist('%s has no field named %r'
                     % (self.object_name, name))
 
     def get_all_field_names(self):