[sqlalchemy] can't delete object (AssertionError: Dependency rule tried to blank-out primary key column)

[Jonathan Vanasco]

This error doesn't make sense to me:

    foo = dbSession.query(Foo).options(joinedload('bar'))

    dbSession.delete(foo.bar)
    dbSession.flush()

    dbSession.delete(foo)
    dbSession.flush()

I'm getting the AssertionError on the `.delete(foo)`, but I've already 
deleted/flushed foo.bar

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