Thank you Michael for quick response. On Tuesday, November 19, 2013 8:36:55 PM UTC-4, Michael Bayer wrote: > > > On Nov 19, 2013, at 7:11 PM, askel <dumm...@mail.ru <javascript:>> wrote: > > Hello everybody, > > I have a question I couldn't find answer on my own so I'll greatly > appreciate if someone could give me an answer. > > Considering simple model https://gist.github.com/momyc/7554839, why would > query like the following work: > > session.query(SourceA).join(SourceA.trans).filter(Trans.amount>0) > > while the following one fails to build join expression: > > session.query(SourceA).join(Trans).filter(Trans.amount>0) > > I suspect that this is because there is not ForeignKey in > class/mapper/table declaration. Or, perhaps, I missed something in building > that relationship. > > It's not a show stopper and I can definitely live with that but knowing > why would bring harmony back to this world :) > > > that would be correct, when you say query(A).join(B), the relationship() > construct isn’t used to resolve how to join those, only the ForeignKey that > exists between the two tables (if any). > > I suppose that’s something else that might be improved upon someday though > I’m sort of tapped on adding behavioral changes to 0.9…. > > >
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