I'm looking for a way to set up a mapper like in this sqlalchemy
example:
class User(object):
pass
class Address(object):
pass
mapper(Address, addresses_table)
mapper(User, users_table, properties={
'boston_addresses': relation(Address, primaryjoin=
and_(users_table.c.user_id==addresses_table.c.user_id,
addresses_table.c.city=='Boston'))
})
The difference is that I don't have the part:
users_table.c.user_id==addresses_table.c.user_id,
This yields the following mapper configuration:
mapper(User, users_table, properties={
'boston_addresses': relation(Address, primaryjoin=
addresses_table.c.city=='Boston')
})
That is, I want a collection boston_addresses on the Users object that
is calculated through a cross join with the condition city='boston'.
But mapping results in the error "Could not determine relationship
direction for primaryjoin condition ... Ensure that the referencing
Column objects have a ForeignKey present ...
But there are deliberately no foreign keys. What else can I do to get
this work?
Best regards,
prinz
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