You are right without some additional work to map users to session IDs its
useless,
but there are many ways from there :
for example every user must have his own IP you can easily map a user to
an ip upon login for example  by using :

auth.settings.login_onaccept = lambda func: usr_connect()    #this
function logs IP of user to some table
auth.settings.logout_onlogout = lambda func2: usr_disconnect() #this
function deletes Ip of user from table




On Tue, Aug 21, 2012 at 7:40 PM, Niphlod <[email protected]> wrote:

> the relevant book session is
> http://web2py.com/books/default/chapter/29/13#Sessions-in-database
>
> file sessions of db won't "save you".
>
> You are in the need of having to know the relationship between session and
> user_id. Every app has different requirements, so you could implement the
> logic to store somewhere the relationship and not having to scan them all.
> Web2py doesn't expose that relationship because:
> a) sessions are created also for not registered users
> b) one registered user can have multiple sessions (one in chrome, the
> other in firefox), even in multiple devices (desktop, nettop, tablet, cell
> phone, etc) and they are considered (rightfully) valid.
>
>
> On Tuesday, August 21, 2012 7:22:42 PM UTC+2, Yarin wrote:
>>
>> Is it possible to clear a session for a single user?
>>
>> Currently, if we need to block user access, we must delete the user
>> record or set registration key = "blocked", and then clear session for the
>> entire site. Is there a better way?
>>
>  --
>
>
>
>

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