On 2/13/2014 11:04 AM, Michael Bayer wrote:
On Feb 13, 2014, at 11:53 AM, Michael Hipp <[email protected]> wrote:
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.
Sorry, it was tripping over a different error, here's the code with extras
removed (I think!):
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])
Gives:
sqlalchemy.exc.AmbiguousForeignKeysError: Could not determine join condition
between parent/child tables on relationship Animal.children - 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.
Thanks for any help,
Michael
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