On Wed, Feb 25, 2015 at 06:10:55PM -0500, Michael Bayer wrote: > > > Julien Cigar <jci...@ulb.ac.be> wrote: > > > On Thu, Feb 19, 2015 at 11:31:10AM -0500, Michael Bayer wrote: > >> Julien Cigar <jci...@ulb.ac.be> wrote: > >> > >>> On Thu, Feb 19, 2015 at 02:45:43PM +0100, Julien Cigar wrote: > >>>> Hello, > >>>> > >>>> I'm using SQLAlchemy 0.9.8 with PostgreSQL and the reflection feature of > >>>> SQLAlchemy. > >>>> > >>>> I have the following tables (only relevant parts are show): > >>>> https://gist.github.com/silenius/390bb9937490730741f2 > >>>> > >>>> and the "problematic" mapper is the one of my association object: > >>>> https://gist.github.com/silenius/1559a7db65ed30a1b079 > >>>> > >>>> SQLAlchemy complains with the following error: > >>>> "sqlalchemy.exc.InvalidRequestError: One or more mappers failed to > >>>> initialize - can't proceed with initialization of other mappers. > >>>> Original exception was: Could not locate any simple equality expressions > >>>> involving locally mapped foreign key columns for primary join condition > >>>> 'pool_invite_result.pool_invite_pool_id = pool_invite.pool_id AND > >>>> pool_invite.pool_id = pool.id' on relationship PoolAccountResult.pool. > >>>> Ensure that referencing columns are associated with a ForeignKey or > >>>> ForeignKeyConstraint, or are annotated in the join condition with the > >>>> foreign() annotation. To allow comparison operators other than '==', the > >>>> relationship can be marked as viewonly=True." > >>>> > >>>> The problem is that in the PoolAccountResult mapper I want a > >>>> relationship to the Pool but the link is made through an intermediate > >>>> table (pool_invite) .. > >>>> > >>>> Any idea how to handle this with SQLAlchemy ? > >>>> > >>>> Thanks :) > >>>> > >>>> Julien > >>> > >>> ... and I'm answering to myself: it seems to work with > >>> https://gist.github.com/silenius/e7e59c96a7277fb5879f > >>> > >>> does it sound right ? > >> > >> Sure. Also, you could use automap which does figure these out in simple > >> cases: http://docs.sqlalchemy.org/en/rel_0_9/orm/extensions/automap.html > > > > always with this, any idea why SQLAlchemy inserts NULL and > > NULL for my two relationship (line 51-79) instead of the pool_obj and > > dup.owner ids (line 89-90), https://dpaste.de/1Trz ..? > > getting a 404 on that link.
Hi Mike, Thanks for your help! I took the time to make a complete test case, available from here https://gist.github.com/silenius/96d6ed2544d14753853f I'm using PostgreSQL, and I checked that all constraints are properly created on server-side but I haven't checked with sqllite:// > > > > > > > > > Thanks, > > Julien > > > > > >>>> -- > >>>> Julien Cigar > >>>> Belgian Biodiversity Platform (http://www.biodiversity.be) > >>>> PGP fingerprint: EEF9 F697 4B68 D275 7B11 6A25 B2BB 3710 A204 23C0 > >>>> No trees were killed in the creation of this message. > >>>> However, many electrons were terribly inconvenienced. > >>>> > >>>> -- > >>>> 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. > >>> > >>> > >>> > >>> -- > >>> Julien Cigar > >>> Belgian Biodiversity Platform (http://www.biodiversity.be) > >>> PGP fingerprint: EEF9 F697 4B68 D275 7B11 6A25 B2BB 3710 A204 23C0 > >>> No trees were killed in the creation of this message. > >>> However, many electrons were terribly inconvenienced. > >>> > >>> -- > >>> 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 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. > > > > -- > > Julien Cigar > > Belgian Biodiversity Platform (http://www.biodiversity.be) > > PGP fingerprint: EEF9 F697 4B68 D275 7B11 6A25 B2BB 3710 A204 23C0 > > No trees were killed in the creation of this message. > > However, many electrons were terribly inconvenienced. > > > > -- > > 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 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. -- Julien Cigar Belgian Biodiversity Platform (http://www.biodiversity.be) PGP fingerprint: EEF9 F697 4B68 D275 7B11 6A25 B2BB 3710 A204 23C0 No trees were killed in the creation of this message. However, many electrons were terribly inconvenienced. -- 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.
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