On Dec 21, 2007, at 3:54 PM, Anton V. Belyaev wrote:
>
> merge worked without an exception this time.
merge is working rudimentally for objects with unloaded scalar/
instance/collection attributes in r3974. whats not yet happening is
the merging of the various query.options() that may be present on the
original deferred loader, which means the merged instance wont
necessarily maintain the exact eager/lazy/deferred loading of the
original, but this is not especially critical for the basic idea to
work.
example script using merge attached.
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from sqlalchemy import *
from sqlalchemy.orm import *
import pickle
engine = create_engine('sqlite://', echo=True)
metadata = MetaData(engine)
users = Table('users', metadata,
Column('id', Integer, primary_key=True),
Column('name', String(30), nullable=False))
users.create()
class User(object):
pass
mapper(User, users, properties={
'name':deferred(users.c.name)
})
u1 = User()
u1.name = 'ed'
sess = create_session()
sess.save(u1)
sess.flush()
sess.clear()
u2 = sess.query(User).get(u1.id)
assert 'name' not in u2.__dict__
u3 = pickle.loads(pickle.dumps(u2))
sess2 = create_session()
u3 = sess2.merge(u3, dont_load=True)
assert 'name' not in u3.__dict__
assert u3.name == 'ed'
