Hi. I have two database schemas, with a table from each I would like to join. The classes for one schema have been created as explicit declarative Bases, while the classes for the other were all created via automap Base. I have a foreign key joining the two tables. Sqlalchemy sees the foreign key, yet does not recognize it or use. Upon import of my Classes, I'm getting this error
NoForeignKeysError: Could not determine join condition between parent/child tables on relationship Cube.target - there are no foreign keys linking these tables. Ensure that referencing columns are associated with a ForeignKey or ForeignKeyConstraint, or specify a 'primaryjoin' expression. datadb.Cube is my declarative base and sampledb.MangaTarget is an automap base. Here are the foreign keys on datadb.Cube In [4]: datadb.Cube.__table__.foreign_keys Out[4]: {ForeignKey(u'mangadatadb.ifudesign.pk'), ForeignKey(u'mangasampledb.manga_target.pk'), ForeignKey(u'mangadatadb.pipeline_info.pk'), ForeignKey(u'mangadatadb.wavelength.pk')} I've created the relationship via Cube.target = relationship(sampledb.MangaTarget, backref='cubes') I've also tried explicitly adding a foreign_keys=[Cube.manga_target_pk] here, but that didn't work either. I initially created the constraint in my schema table with ALTER TABLE ONLY mangadatadb.cube ADD CONSTRAINT manga_target_fk FOREIGN KEY (manga_target_pk) REFERENCES mangasampledb.manga_target(pk) ON UPDATE CASCADE ON DELETE CASCADE; Can a relationship be created on a foreign key between a declarative base class and an automap base class? I tested out the relationships with an explicit declarative Base class for MangaTarget and everything works perfectly. However, explicitly declaring all the tables in my sampledb schema is not really an option, unfortunately. I'm at a loss here. If it should be possible, is there a procedure somewhere documented on how to get that working? Thanks for any help. Cheers, Brian -- 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 https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.