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
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