On Jul 22, 2008, at 1:48 PM, Erez wrote:
>
> So how would you solve it?
>
> I tried defining two foriegn keys:
> class Link(Base):
> __tablename__ = 'links'
>
> node_id = Column(Integer, ForeignKey('nodes.id'))
> node_id2 = Column(Integer, ForeignKey('nodes.id'))
>
> id = Column(Integer, primary_key=True)
> type = Column(String)
>
> fro = relation(Node, order_by=node_id, backref="links_out")
> to = relation(Node, order_by=node_id2, backref="links_in")
>
> but got:
> sqlalchemy.exc.ArgumentError: Could not determine join condition
> between parent/
> child tables on relation Link.fro. Specify a 'primaryjoin'
> expression. If this
> is a many-to-many relation, 'secondaryjoin' is needed as well.
>
> Is a primaryjoin necessary then?
yup
>
> I've tried to look-up the solution, but couldn't find any.
here
http://www.sqlalchemy.org/docs/05/mappers.html#advdatamapping_relation_customjoin
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