primaryjoin = """and_(Article.author_id == AuthorOverride.author_id ,
> Article.topic_id == AuthorOverride.topic_id ,
> AuthorOverride.is_published == True)
>
""",
foreign_keys = ( Article.author_id , Article.topic_id),
Solved . I was close.
1. Wrap the join conditions in and_()
2. Add in a foreign_keys argument
I had seen the "and_()" syntax before, but forgot about it. It's only in
the ORM narrative (
http://docs.sqlalchemy.org/en/rel_0_8/orm/relationships.html#specifying-alternate-join-conditions
) , but not the API docs
(
http://docs.sqlalchemy.org/en/rel_0_8/orm/relationships.html#sqlalchemy.orm.relationship
), which made it harder to find.
The foreign keys bit was in the narrative only, but not the API
(
http://docs.sqlalchemy.org/en/rel_0_8/orm/relationships.html#creating-custom-foreign-conditions
)
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