diff options
Diffstat (limited to 'lib/sqlalchemy/orm/query.py')
| -rw-r--r-- | lib/sqlalchemy/orm/query.py | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/sqlalchemy/orm/query.py b/lib/sqlalchemy/orm/query.py index 81be0e63c..0f5b8bf88 100644 --- a/lib/sqlalchemy/orm/query.py +++ b/lib/sqlalchemy/orm/query.py @@ -1843,6 +1843,12 @@ class Query(object): elif self._entities: left = self._entities[0].entity_zero_or_selectable + if left is None: + raise sa_exc.InvalidRequestError( + "Don't know how to join from %s; please use " + "select_from() to establish the left " + "entity/selectable of this join" % self._entities[0]) + if left is right and \ not create_aliases: raise sa_exc.InvalidRequestError( |