[web2py] joins in crud select

[niknok]

Can I do joins in CRUD?

I'm getting a 404 Not Found error with this: 

        
rows=crud.select(db((db.qa.candidate==user_id)&(db.quiz.id==db.qa.quiz)))


But the following works alright: 

        rows=db((db.qa.candidate==user_id)&(db.qa.quiz==db.quiz.id)).select()



/r
Nik