I suspect this may be trying to do something similar perhaps..
http://docs.sqlalchemy.org/en/latest/_modules/examples/materialized_paths/materialized_paths.html
But I don't understand this part. Specifically where 'c' comes from:
ancestors = relationship("Node", viewonly=True, secondary=secondary,
primaryjoin=id == secondary.c.id,
secondaryjoin=secondary.c.ancestor_id == id,
order_by=path)
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http://www.sqlalchemy.org/
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