Sql Alchemy before-select event

Question

I am playing around with SQL Alchemy and I need to do some work before SQLA executes select statement. So I figured out that the best way would be to use SQLA Event, but I cant find a suitable before-select event. Is it there but I am poor at finding.

If its not there, can somebody tell me how to write my custom event?

Thx for any suggestions. Best Regards Gabe

Answer 1

So sorry for not writing for a while but some while ago I did what I wanted to do. I don`t no if it is an elegant way but it works.

So what I did is writing my own Session class:

class MySession(Session):

    def execute(self, clause, params=None, mapper=None, **kw):
        # Your magic with clause here
        return Session.execute(self, clause, params, mapper)

Then you need to create your session like this:

Session = sessionmaker(engine, class_ = MySession)

Hope that it will help someone who struggled with similar issue :)

Regards

P.s. Thanks everybody who contributed in this question.