The group information is loaded on login and cached in the session. 
If you check 

auth.user_groups you find a dictionary of {group_id:group_role}.

On Wednesday, 25 June 2014 13:08:17 UTC-5, Carlos Zenteno wrote:
>
> I am classifying my users within groups (ie, carpenters group) but I am 
> wondering
> if it would be useful or more efficient to also add a field in auth_user 
> (ie, is_carpenter).
>
> Would it be faster to check the is_carpenter flag in the db or to do it 
> from the auth
> system checking the membership of the user to the group?
>
> Would it be better to do both?  use the group to restricting functions and 
> check
> the field for other logic?
>
> thanks...
>

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