Hmm, I already tried that but as far as I know SQLAlchemy doesn't automatically join in queries. So Job.dependencies doesn't work in a query if I didn't do something wrong.
Am Donnerstag, 17. April 2014 15:33:48 UTC+2 schrieb Michael Bayer: > > this is a bit of a brain teaser because I don’t know LINQ and we don’t > have an “all()” operator. Spent a few minutes trying to guess what the > heck “all()” would query for; in SQL, it’s very easy to check if a > collection contains some elements with some kind of criteria…but “all”, I > thought, how can you ever know that there’s not another row somewhere that > isn’t in the”all”, which gave me the “duh” moment. for all() you need to > check that there are “not any” of the *opposite* - e.g. no rows exist that > don’t match that criteria. We could add this operator really easily. > > But for now > > query(Job).filter(Job.status == > ‘queued’).filter(~Job.dependencies.any(Dependency.status != ‘done’)) > > > > On Apr 17, 2014, at 8:51 AM, Maik Riechert <maik.r...@arcor.de<javascript:>> > wrote: > > Hi everyone, > > I am really lost on a query I try to formulate. In LINQ it would probably > like that (haven't done LINQ in quite some time): > > from j in Job > where j.status == 'queued' and j.dependencies.all(d => d.status == 'done') > select j > > So, Job.dependencies is a self-referential many-to-many association which > describes dependencies between processing jobs. And now I try to find those > queued jobs whose dependencies are finished. > > I'm brand new to sqlalchemy, I appreciate any help :) > > Thanks > Maik > > -- > 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+...@googlegroups.com <javascript:>. > To post to this group, send email to sqlal...@googlegroups.com<javascript:> > . > Visit this group at http://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. > > > -- 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. For more options, visit https://groups.google.com/d/optout.
