its a mapper arg called inherit_condition: __mapper_args__ =
{"inherit_condition": id==A.id}
On Jul 24, 2013, at 3:42 PM, Seth P <[email protected]> wrote:
> The code below produces the error message below. How do I tell SQLAlchemy
> that the inheritance join condition should be b.id == a.id rather than
> b.parent_a_id == a.id? (I would think the primary_key=True could be a
> hint...) I can't figure it out from the documentation.
>
> class A(Base):
> __tablename__ = 'a'
> id = Column(Integer, primary_key=True)
>
> class B(A):
> __tablename__ = 'b'
> id = Column(Integer, ForeignKey('a.id'), primary_key=True)
> parent_a_id = Column(Integer, ForeignKey('a.id'))
>
> sqlalchemy.exc.AmbiguousForeignKeysError: Can't determine join between 'a'
> and 'b'; tables have more than one foreign key constraint relationship
> between them. Please specify the 'onclause' of this join explicitly.
>
>
> Thanks,
>
> Seth
>
>
>
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