pyramid_sqlalchemy_utility

A simple pyramid extension which register a sqlalchemy utility. It add a sqla_session property to request object. Session is opened at first access and automatically commited and closed on request's finished callback.

It tights sqlalchemy session to request lifecycle rather than relying on thread local scoped sessions as recommended in sqlalchemy documentation:

The Session can be established as the request begins, or using a lazy initialization pattern which establishes one as soon as it is needed. The request then proceeds, with some system in place where application logic can access the current Session in a manner associated with how the actual request object is accessed. As the request ends, the Session is torn down as well, usually through the usage of event hooks provided by the web framework.

—http://docs.sqlalchemy.org/en/rel_0_8/orm/session.html

Source code and example available on https://github.com/hadrien/pyramid_sqlalchemy_utility