Is there a way to declaratively create many to many relationships where the 'secondary' parameter for the relationship is deferred ?
I couldn't get this to work, e.g. class User(DeclarativeBase): id = Column(Integer, primary_key=True) name = Column(String(20)) groups = relation("Group", primaryjoin=("User.id == GroupMember.user_id"), secondaryjoin=("GroupMember.group_id == Group.id"), secondary="GroupMember") (the other classes are defined later). I was able to get around this with the following patch. --- a/sqlalchemy0.5/lib/sqlalchemy/orm/properties.py Mon Aug 31 22:37:21 2009 -0700 +++ b/sqlalchemy0.5/lib/sqlalchemy/orm/properties.py Tue Sep 01 22:11:07 2009 -0700 @@ -736,7 +745,11 @@ # accept callables for other attributes which may require deferred initialization for attr in ('order_by', 'primaryjoin', 'secondaryjoin', 'secondary', '_foreign_keys', 'remote_side'): if util.callable(getattr(self, attr)): - setattr(self, attr, getattr(self, attr)()) + called_value = getattr(self, attr)() + # the 'secondary' param requires a table, not a declarative class... + if attr == 'secondary' and hasattr(called_value, '__mapper__'): + called_value = called_value.__mapper__.mapped_table + setattr(self, attr, called_value) # in the case that InstrumentedAttributes were used to construct # primaryjoin or secondaryjoin, remove the "_orm_adapt" annotation so these - Jae --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---