In the unit tests for one module of my app, I'm using the following setup:
class SomeTestCase(TestCase):
def __init__(self, *args, **kwargs):
TestCase.__init__(self, *args, **kwargs)
engine = create_engine("postgresql+psycopg2://...", echo=False)
self.session = scoped_session(sessionmaker(bind=engine))()
...
def setUp(self):
self.session.begin_nested()
def tearDown(self):
self.session.rollback()
def test_somefunction(self):
self.session.begin_nested()
try:
# add Object1
session.flush() # To retrieve Object1.id, which does
work and is returned on attribute access
...
# add some other objects, including Object2 of class Thing
...
session.flush()
session.commit()
except:
session.rollback()
raise
else:
object_id = Object2.id # Also works
session.query(Thing).filter(Thing.id = object_id).one()
# Raises a NoResultFound exception: "No row was found for
one()"
After some setup and other operations, the generated SQL shows savepoints 1
and 2 are created,
followed by various insertions and updates, then savepoint 2 is released,
and finally it ends with
a rollback to savepoint 1.
With two commits instead of one the problem persists, while three commits
fixes the problem but then the changes aren't removed after calling
rollback (which I suppose makes
sense since it would have then committed at the top session scope).
Any ideas on how to solve this would be greatly appreciated.
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