This is how I setup my database for an application (in Flask):
from sqlalchemy.engine import create_engine
from sqlalchemy.orm import scoped_session, create_session
from sqlalchemy.ext.declarative import declarative_base
engine = None
db_session = scoped_session(lambda: create_session(bind=engine,
autoflush=False, autocommit=False, expire_on_commit=True))
Base = declarative_base()
Base.query = db_session.query_property()
def init_engine(uri, **kwargs):
global engine
engine = create_engine(uri, **kwargs)
Base.metadata.create_all(bind=engine)
return engine
If I connect to a file database that has had tables created already, everything works fine, but using sqlite:///:memory: as a target database gives me:
OperationalError: (OperationalError) no such table: users u'DELETE FROM users' ()
when querying like so for ex.:
UsersTable.query.delete()
db_session.commit()
I am accessing this code from a unit test. What is the problem?
Thanks
Edit:
Working setup of the application:
app = Flask(__name__)
app.config.from_object(__name__)
app.secret_key = 'XXX'
# presenters
from presenters.users import users
# register modules (presenters)
app.register_module(users)
# initialize the database
init_engine(db)
