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 > >> -- >> 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.
