Likely because when user log in system , is created a object AUTH that
contains all informations about current user logged , at login action
happen all operations necessary to get user data of database ( including
groups informations related )
Then with all this data in "session" don't need verify in database level ,
because exists a object in "session" with this data.
I guess :D , I tried analyse the code's web2py , and the Auth object create
a this.user_groups attribute
request = current.request
session = current.session
auth = session.auth
self.user_groups = auth and auth.user_groups or {}
Then all data about auth.* using "session data"
Reference:
https://github.com/web2py/web2py/blob/master/gluon/tools.py#L1805
Em sexta-feira, 11 de novembro de 2016 11:22:12 UTC-3, 黄祥 escreveu:
>
> thanks all for the detail explanation, learn a lot new things today
> {{=DIV(auth.user_groups) }}
> *result :*
> {1L: 'Admin', 2L: 'User'}
>
> {{=DIV(auth.user_groups.values() ) }}
> *result :*
> AdminUser
>
> {{=set(auth.user_groups.values() ) }}
> *result :*
> set(['Admin', 'User'])
>
> now about hitting database, just want to clarify in web2py there is
> auth.has_membership()
> *e.g.*
> *controllers/default.py*
> """
> *# 1 usually used*
> has_membership_admin = auth.has_membership(role = 'Admin')
> """
>
> *# 2 learn today*
> has_membership_admin = 'Admin' in auth.user_groups.values()
>
> def test():
> table = db.test
> grid = SQLFORM.grid(table, deletable = has_membership_admin)
> return locals()
>
> did the #2 is faster than #1 because #2 didn't hit database?
>
> thanks and best regards,
> stifan
>
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