Ok, I've only put one() here for an example. I saw the query, there is no LIMIT. And it selects only filtered results, as i wanted. But I' m still unsure if i get it right about how SQLalchemy treat contains_eager-does it load data for mentioned relationships only from query which we declare this option to?
Отправлено с моего Андроида -----Original Message----- From: Michael Bayer <mike...@zzzcomputing.com> To: sqlalchemy@googlegroups.com Sent: сб, 31 янв 2015 20:51 Subject: Re: [sqlalchemy] Is it possible to populate relationship's collection with only query-filtered results using contains_eager()? Юрий Пайков <dia...@cry5tal.in> wrote: > When I do a query like this > > result = session.query(A).\ > join(A.bs).\ > join(B.cs).\ > filter_by(C.somedata.in_([4455, 4466])).\ > options(contains_eager(A.bs).contains_eager(B.cs)).one() > > and list related C objects > > for b in result.bs: > b.cs > > I get all related to B C objects instead of only those with 4455, 4466 values > - even though I filtered the output of the statement. turn on echo=True that will show what SQL is being emitted. That one() might be adding a LIMIT to the query that you don’t want, and the contains_eager() might be failing to connect to the collections, and thus they are lazy loaded after the fact. > > So eager loading when used with contains_eager() - as I understand - > shouldn't load other related objects apart from those which are selected by > statement. Still I get Cs with values other that 4455, 4466(i.e. all the > collection) :( Could any suggest from where come other Cs? Thanks in advance > > > -- > 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. -- You received this message because you are subscribed to a topic in the Google Groups "sqlalchemy" group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/sqlalchemy/Kpzqn81Kbcc/unsubscribe. To unsubscribe from this group and all its topics, 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. -- 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.
