I think you need to use the remote_side argument for the children relationship, since it's the same table
http://docs.sqlalchemy.org/en/rel_0_9/orm/relationships.html#adjacency-list-relationships On Thu, Feb 13, 2014 at 12:04 PM, Michael Bayer <mike...@zzzcomputing.com>wrote: > > On Feb 13, 2014, at 11:53 AM, Michael Hipp <mich...@redmule.com> wrote: > > > I'm trying to do something like this: > > > > class Animal(Base): > > __tablename__ = 'animals' > > id_ = Column(Integer, primary_key=True) > > > > sire_id = Column(Integer, ForeignKey('animals.id_')) > > dam_id = Column(Integer, ForeignKey('animals.id_')) > > > > sire = relationship('Animal', foreign_keys=[sire_id]) > > dam = relationship('Animal', foreign_keys=[dam_id]) > > children = relationship('Animal', foreign_keys=[sire_id, dam_id]) > > > > It gives: > > > > sqlalchemy.exc.AmbiguousForeignKeysError: Could not determine join > condition between parent/child tables on relationship Animal.first_owner - > there are multiple foreign key paths linking the tables. Specify the > 'foreign_keys' argument, providing a list of those columns which should be > counted as containing a foreign key reference to the parent table. > > > > I've spent lots of time here, but I'm just not seeing the answer for > this father-mother-children relationship. > > http://docs.sqlalchemy.org/en/rel_0_9/orm/relationships.html > > I don’t see a “first_owner” relationship defined above, so the above > example is not complete. > > The approach using “foreign_keys” is the correct approach to resolving > ambiguity in join conditions, however. > > If the documented approach is not working you’d need to provide a succinct > self-contained example I can run. > > > -- 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/groups/opt_out.
