It works using the example many to many of the book: for x in db(db.auth_user.id>0).select(db.auth_user.id): groups = [] users_and_groups = db((db.auth_user.id==x.id)& (db.auth_user.id==db.auth_membership.user_id) & (db.auth_group.id==db.auth_membership.group_id)) for g in users_and_groups.select(db.auth_group.role, orderby=db.auth_membership.group_id): groups.append(g.role) # [...]
Em quarta-feira, 2 de dezembro de 2015 14:31:14 UTC-2, Fabiano Almeida escreveu: > > Hi! > > I'm trying to create a list of roles for each user: > > for x in db(db.auth_user.id>0).select(db.auth_user.id): > ....groups = [] > ....for g in db(db.auth_membership.id > 0).select(db.auth_group.role, > join=[db.auth_group.on(db.auth_group.id==db.auth_membership.group_id), > db.auth_user.on(db.auth_user.id==db.auth_membership.user_id)]): > ........groups.append(g.role) > > and the error: > > TypeError: reduce() of empty sequence with no initial value > > How to do this list? > > thanks, > > Fabiano > -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.