On May 10, 2013, at 3:03 PM, Ladislav Lenart <lenart...@volny.cz> wrote:
> Hello. > > My main concern was that the query creates a cartesian product and I thought > the > warning might have something to do with it. It haven't. The problem is related > to the use of select_from(): > > q = session.query(cls, PersonalContact).select_from(q_cte_union) > q = q.join(cls, cls.id == q_cte_union.c.partner_id) > > This part renders the following SQL: > > SELECT * > FROM > q_cte > JOIN partner ON q_cte.partner_id = q_cte.partner_id > > As you can see, the JOIN condition is wrong though I have no idea why. The > following works, however: > > q = session.query(cls) > q = q.add_entity(PersonalContact) > q = q.join(q_cte_union, cls.id == q_cte_union.c.partner_id) > > Is my usage of select_from() bad for some reason? Do you know what's going > on? I > can provide you a fully runnable test case if you still need it (on Monday). > Note also that I use SA 0.7.9. Is this fixed in later versions? I've no idea why you're getting it without more context - if everything is generated from a query(), typically the "labels" are already applied, with the exception of some operations such as subquery() (maybe cte? not sure, I'd need to try it, hence an already existing example saves me lots of time tinkering around trying to guess what you're doing). Things have been improved in 0.8 regarding same-named columns but that only applies when the labels are already present. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
