This is a spin-off from the thread on how to do setup/test-app/teardown:
http://groups.google.com/group/sqlalchemy/browse_thread/thread/4fd6344bf8b9c033
(thanks for everyone's help on that)
I had posted test code that illustrates it's possible to save/delete a
mapped object using two different sessions indepedently. But now,
when I try using a mapped class that has been assigned a session, that
is, Session.mapper() instead of mapper(), the test errors in
InvalidRequestError: Object '[EMAIL PROTECTED]' is already attached
to session '18333488' (this is '18402096')
but, since I am explicitly saving it to a new session and the session
has a different scope, shouldn't this be possible? Maybe I'm not
fully understanding "scoped" sessions.
FWIW, if I del so._sa_session_id before fixture_session.save(so) then
the assertions later on all pass. Not that I'm going to do this,
promise ;)
-Kumar
PS. I thought for a minute I needed save_on_init=False but this didn't solve it.
from sqlalchemy import *
from sqlalchemy.orm import scoped_session, sessionmaker, mapper
from sqlalchemy.exceptions import IntegrityError
PrivateSession = scoped_session(
sessionmaker(autoflush=False, transactional=True),
scopefunc=lambda:__name__) # a private scope
AppSession = scoped_session(
sessionmaker(autoflush=False, transactional=True))
dsn = 'sqlite:///:memory:'
def test_sa_scoping():
engine = create_engine(dsn)
metadata = MetaData()
sometable = Table('sometable', metadata,
Column('id', Integer, primary_key=True),
Column('keyname', String(30), unique=True))
class SomeObject(object):
pass
conn = engine.connect()
AppSession.configure(bind=conn)
app_session = AppSession()
metadata.create_all(bind=engine)
# when this is just mapper(), the test passes
AppSession.mapper(SomeObject, sometable)
conn = engine.connect()
PrivateSession.configure(bind=conn)
trans = conn.begin()
fixture_session = PrivateSession()
# create some data to test with :
so = SomeObject()
so.keyname = "some unique key name"
fixture_session.save(so)
fixture_session.flush()
trans.commit()
trans = conn.begin()
so2 = SomeObject()
so2.keyname = "some unique key name"
app_session.save(so2)
try:
app_session.flush()
except IntegrityError:
# violated unique key
trans.rollback()
else:
trans.commit()
app_session.close()
# after testing application code, I want to tear down
# test even if the app had an error :
assert so in fixture_session
trans = conn.begin()
fixture_session.delete(so)
fixture_session.flush()
trans.commit()
rs = fixture_session.query(SomeObject).all()
assert rs == [], "unexpected: %s" % rs
if __name__ == '__main__':
test_sa_scoping()
Traceback (most recent call last):
File "test_sa_scoping.py", line 65, in ?
test_sa_scoping()
File "test_sa_scoping.py", line 37, in test_sa_scoping
fixture_session.save(so)
File
"/Users/kumar/env/sqlalchemy-exp/lib/python2.4/site-packages/SQLAlchemy-0.4.2p3-py2.4.egg/sqlalchemy/orm/session.py",
line 822, in save
self._save_impl(instance, entity_name=entity_name)
File
"/Users/kumar/env/sqlalchemy-exp/lib/python2.4/site-packages/SQLAlchemy-0.4.2p3-py2.4.egg/sqlalchemy/orm/session.py",
line 993, in _save_impl
self._attach(instance)
File
"/Users/kumar/env/sqlalchemy-exp/lib/python2.4/site-packages/SQLAlchemy-0.4.2p3-py2.4.egg/sqlalchemy/orm/session.py",
line 1029, in _attach
raise exceptions.InvalidRequestError("Object '%s' is already attached "
sqlalchemy.exceptions.InvalidRequestError: Object
'[EMAIL PROTECTED]' is already attached to session '18333488' (this
is '18402096')
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