When retrieving a field by name, handle a missed case when the cache cannot be

initialised yet.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@7478 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/options.py

@@ -248,7 +248,7 @@ class Options(object):
                 return self._name_map[name]
             except AttributeError:
                 cache = self.init_name_map()
-                return self._name_map[name]
+                return cache[name]
         except KeyError:
             raise FieldDoesNotExist('%s has no field named %r'
                     % (self.object_name, name))