Thanks Michael for your attention! понедельник, 2 февраля 2015 г., 2:56:51 UTC+5 пользователь Michael Bayer написал: > > > > Юрий Пайков <dia...@cry5tal.in <javascript:>> wrote: > > > Well, I added "echo=True" and saw the queries - no additional were made. > > Then I added > > populate_existing() > > > > and out of the blue I started to get the desired result, but frankly I > don't quite understand why. What side-effects this could bring? > > it means the parent records in question were already loaded, and already > present in the identity map for your session - the collections were there > already, and the contains_eager had no effect on their contents. > > > > > > > > > суббота, 31 января 2015 г., 21:22:08 UTC+5 пользователь Michael Bayer > написал: > > > > Anyway, yes, contains_eager says, “populate these collections”. the > usage looks correct, so the echo=True, or even echo=‘debug’ which will show > you the result rows coming in, will show you where its going wrong. > > > > or if those collections were already populated previously within that > Session, that would affect it also. you can say query.populate_existing() > to force it to re-load everything. > > > > > > and out of the blue I started to get the desired result, but frankly I > don't quite understand why > > > > > > суббота, 31 января 2015 г., 21:22:08 UTC+5 пользователь Michael Bayer > написал: > > > > Anyway, yes, contains_eager says, “populate these collections”. the > usage looks correct, so the echo=True, or even echo=‘debug’ which will show > you the result rows coming in, will show you where its going wrong. > > > > or if those collections were already populated previously within that > Session, that would affect it also. you can say query.populate_existing() > to force it to re-load everything. > > > > > > > > -- > > 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. >
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