Michael Bayer wrote:
>
> On Apr 4, 2008, at 8:06 PM, Mike Bernson wrote:
>
>> user = Table('users', metadata,
>> Column('id', Integer, primary_key=True),
>> Column('account_name', String(64)))
>>
>> address = Table('mail', metadata,
>> Column('id', Integer, primary_key=True),
>> Column('user_id', Integer, ForeignKey('users.id')),
>> Column('email', String(64)))
>>
>> metadata.create_all()
>>
>> class User(object):
>> __sa_instrument_class__ = SetListener
>>
>> class Address(object):
>> __sa_instrument_class__ = SetListener
>>
>> add_map = mapper(Address, address)
>> user_map = mapper(User, user, properties={
>> 'emails': relation(add_map, lazy=True, uselist=True)
>> })
>>
>> Is there any way to find out what is already loaded 'emails' ?
>>
>> I get events with appending to emails. Is there any way to get
>> events when sqlalchemy load data into sqlalchemy ?
>>
>> What I am trying to do is cause some initialization to happen on
>> data that
>> get loaded into relation without causing the lazy relations to be
>> loaded. I
>> am using append event to known when a relation is added. I need to
>> do the
>> initialization after the object is created.
>
> would using your own collection class work ? The blank collection is
> initialized before anything is loaded into it so you could pick up on
> __init__(). im not sure at which point you want to get at the
> collection. if its right before a lazy load starts, i think that
> would do it.
>
> Also the event API changed in the branch recently, you're getting an
> InstanceState and not an instance for the first argument now (get the
> instance using state.obj()).
>
>
I will try using collection class. I think that will work fine.
I tried once to move to the tip of user_event branch and things broke
so I will stay at this rev tag until till it get stable or ready to merge
into the main branch.
An idea when the event stuff might get merge into the main branch ?
>
>
>
>
>
> >
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