On 8/21/06, Michael Kent <[EMAIL PROTECTED]> wrote:
> I'm having trouble figuring out how to access the data on the 'one' side of a
> 'many-to-one' relationship.
>
> If I have the following setup:
>
> personTable = Table('person',
> Column('person_id', Integer),
> Column('name', String(20)),
> Column('address', ForeignKey('address.address_id'),
> )
>
> addressTable = Table('address',
> Column('address_id', Integer),
> Column('street', String(20),
> )
>
> class Person(object):
> pass
>
> class Address(object):
> pass
>
> personMapper = mapper(Person, personTable)
>
> addressMapper = mapper(Address, addressTable,
> properties=dict(persons=relation(Person)))
>
[snip]
>
> Why is it easy to go in one direction, but not in the other. What am I
> missing?
>
> Thanks.
You want to use a backref for that:
http://www.sqlalchemy.org/docs/datamapping.myt#datamapping_relations_backreferences
Note that the documentation example is the reverse of yours: you have
multiple People sharing one Address, while the example in the docs is
of one User with multiple Addresses. It should be pretty easy to
figure out, nonetheless.
--
Robin Munn
[EMAIL PROTECTED]
GPG key 0xD6497014
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