Flask SQLAlchemy setup dynamic URI

Question

I have a Flask app served up under WSGI where the database URI changes over time. Every two hours the URI toggles to another database. I\'m using that time to fill up one

Answer 1

You can make a custom builder for the session that will re-create the engine and scoped session when your rules dictate it. Something like

class SessionManager(object):

    def __init__(self):
        self.session = None

    def get_session(self):
        # return existing session or make a new engine and scoped_session

To make this class transparent, use Werkzeug's LocalProxy. The code that uses the sessions won't have to change at all.

session_manager = SessionManager()
db_session = LocalProxy(session_manager.get_session)