On Sep 26, 2009, at 1:25 PM, BEES INC wrote:
> class Vals(dict): pass
>
> class Foo(object):
>
> def __init__(self, name):
> self.vals = Vals()
> self.name = name
>
> def add(self, key, value):
> self.vals[key] = value
you would need to say self.vals[key] = Vals() here.
column_mapped_collection uses full ORM instances as values. In any
case I don't think you mean to map the "vals" table to a "dict"
subclass - the mapping of a table to a class implies how to represent
a single *row*, not the full table as a whole.
If you are attempting to map from scalar keys to scalar (non object)
values, you should look into using the AssociationProxy to accomplish
that.
>
> engine = create_engine('sqlite:///:memory:', echo=True)
> meta = MetaData(bind=engine)
> Session = sessionmaker(bind=engine)
>
> vals = Table('vals', meta,
> Column('id', Integer, primary_key=True),
> Column('date', DateTime),
> Column('val', Integer),
> Column('foo_id', Integer, ForeignKey('foo.id'))
> )
>
> mapper(Vals, vals)
>
> foo = Table('foo', meta,
> Column('id', Integer, primary_key=True),
> Column('name', String(50))
> )
>
> mapper(Foo, foo, properties = dict(
> vals = relation(Vals, collection_class = column_mapped_collection
> (vals.c.date))
> ))
>
> sess = Session()
> meta.create_all()
>
> f = Foo('hello')
> f.add(datetime.now(), 1.0)
>
>
> >
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