use `sqlalchemy.orm.aliased` to create an alias of A for your join
condition...
A_alt = sqlalchemy.orm.aliased(A, name='a_alt')
then use that to join and specify your join conditions
the `contains_eager` needs to specify the alias though.
options(sqlalchemy.orm.contains_eager('a.c.a', alias= A_alt)
i didn't know about that last bit, and just had an issue 2 days ago in
this thread, which has some sample code showing how an aliased join works.
https://groups.google.com/forum/#!topic/sqlalchemy/VLStmyJazVM
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The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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