diff options
Diffstat (limited to 'lib/sqlalchemy/sql/visitors.py')
| -rw-r--r-- | lib/sqlalchemy/sql/visitors.py | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/lib/sqlalchemy/sql/visitors.py b/lib/sqlalchemy/sql/visitors.py index a5bd497ae..4471d4fb0 100644 --- a/lib/sqlalchemy/sql/visitors.py +++ b/lib/sqlalchemy/sql/visitors.py @@ -34,13 +34,10 @@ class VisitableType(type): """ def __init__(cls, clsname, bases, clsdict): - if cls.__name__ == 'Visitable': + if cls.__name__ == 'Visitable' or not hasattr(cls, '__visit_name__'): super(VisitableType, cls).__init__(clsname, bases, clsdict) return - assert hasattr(cls, '__visit_name__'), "`Visitable` descendants " \ - "should define `__visit_name__`" - # set up an optimized visit dispatch function # for use by the compiler visit_name = cls.__visit_name__ |