I am trying to construct a filter against a table that has two references
to the same child table. But I am completely confused how to go about it.
I've seen lots of examples for using aliases, but I have not been able to
get any to work. So I'll just try to give my example simply, and ask what
Thank you all,
It turned out that combining SELECT FOR UPDATE and isolation_level
SERIALIZABLE and pyramid_tm 0.8 produced the expected result. IOW:
everything is now working correctly:
The only change to history_meta.py we ended up doing was the following:
```
#attr['version'] =
Clarification:
Originally, when we tried SELECT FOR UPDATE and isolation_level
SERIALIZABLE unsuccessfully, we were using pyramid_tm 0.7. As soon as we
upgraded to 0.8, it all started working correctly.
On Monday, December 8, 2014 6:15:26 PM UTC-6, HP3 wrote:
Thank you all,
It turned out
you’d use aliased and join twice as:
c1 = aliased(Child)
c2 = aliased(Child)
session.query(Parent).join(c1, Parent.child1).outerjoin(c2,
Parent.child2).filter(or_(c1.foo == ‘bar’, c2.foo = ‘bar’))
http://docs.sqlalchemy.org/en/rel_0_9/orm/tutorial.html#using-aliases
