you can use strings with Python in them when you use declarative even
with args like primaryjoin, so you could say things like:
class Policy(DeclarativeBase):
__tablename__ = 'policy'
policy_state =
relation('State',backref='state_policies',primaryjoin="Policy.state_of_policy_code==State.code")
domicile_state =
relation('State',backref='domicile_policies',primaryjoin="Policy.state_of_domicile_code==State.code")
this would eliminate the need to have your classes in a particular
order.
Its documented about a third of the way down at
http://www.sqlalchemy.org/docs/05/plugins.html#plugins_declarative .
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