this is the association object pattern, as described at: http://www.sqlalchemy.org/docs/04/mappers.html#advdatamapping_relation_patterns_association
with that pattern, you should specifically *not* use the "secondary" argument on your mapper as the group_user_tbl will be explicitly mapped. After setting that up you may want to look at the association proxy which can smooth some of the clumsiness of dealing with an association object: http://www.sqlalchemy.org/docs/04/plugins.html#plugins_associationproxy On Feb 13, 2008, at 9:38 AM, g wrote: > > Say we have a many-to-many relation: > > mapper(Group, group_tbl, > properties={'users' : relation(User, secondary=group_user_tbl) } > ) > > group_user_tbl = Table('group_user', metadata, > Column('group_id', Integer, ForeignKey('group.group_id')), > Column('user_id', Integer, ForeignKey('user.user_id')), > Column('expiry', DateTime) > ) > > Is there any way to make the 'expiry' an attribute to the User of a > particular Group? > eg. > my_group = session.query(Group).get(30) > u = my_group.users[0] > exp = u.expiry > exp = datetime.datetime.now() > session.flush() > > --~--~---------~--~----~------------~-------~--~----~ 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 [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
