Hi Michael,

I read http://www.sqlalchemy.org/trac/ticket/1751 with some curiousity.

My take on declarative mixins was that _as_declarative should basically accumulate everything from the bases as if it were in the class itself and then let _as_declarative behave exactly as it usually did on the resultant attributes.

As such, I can't see why relationships or foreign keys in columns are a bad thing. You can have multiple classes with a relationship to a single other class, so why not allow that relationship to be abstracted out in a mixin? (DRY and all that...)

cheers,

Chris

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