I was reading the docs here:
http://www.sqlalchemy.org/docs/adv_datamapping.myt#advdatamapping_properties_customjoin

and in the example the custom join condition checks if the city of the address is boston. Say for a moment that the user class had the String column favorite_city. How would you set the custom join to use a bindparam (or something else) so I could add the property favorite_addresses to User such that it would select all addresses where address.city equals a user instances favorite city attribute.


Thanks,

Michael
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