On Sep 20, 8:12 pm, Damjan <[email protected]> wrote:
> > By the way can somebody explain me this trick "()":
>
> > session = scoped_session(lambda: sessionmaker
> > (bind=application.database_engine)(), local_manager.get_ident)
>
> sessionmaker is a factory function, ie a function that returns a
> function. with sessionmaker(..)() you immediately call the returned
> function (with no arguments in this case).
>
> I do wonder why you need "lambda: sessionmaker(..)()" as an argument
> though? It seems to me it's the same as if you used just "sessionmaker
> (..)" as the first argument.
and seems to work here:
import sqlalchemy
import werkzeug
from sqlalchemy.orm import scoped_session, sessionmaker
sqlite_db = sqlalchemy.create_engine('sqlite:////tmp/foo.db')
local_manager = werkzeug.LocalManager()
session = scoped_session(sessionmaker(bind=sqlite_db),
local_manager.get_ident)
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