Is there any way to declare a "remote side" backpopulates? i.e. where I 
declare a relationship on class A to appear only on class B? I would like 
the relationship only to be available on the remote class but I do not want 
to / cannot modify the code for the remote class.

For example:

class User(Model):
    ...

class Permission(Model):
    user_active = relationship(User, backpopulates_remote='permissions')


where the user_active field does not get created on Permission but the 
permissions field does get created on User? This comes up since I end up 
writing:

class Permission(Model):
    user = relationship(User)
    user_active = relationship(User, backref='permissions', primary_join=...
is_active...)

and I do want the user field on Permission and the permissions field on 
User, but I do not want the user_active, as it is extraneous.

-- 
SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper

http://www.sqlalchemy.org/

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