[web2py] auth.accessible_query(...)

[Marin]

Hi,

there is a bug in documentation, 
http://web2py.com/book/default/chapter/08#Authorization

rows = db(accessible_query('read', db.mytable, user_id))\
    .select(db.mytable.ALL)

should be:

rows = db(auth.accessible_query('read', db.mytable, user_id))\
    .select(db.mytable.ALL)

Also, I noticed that accessible_query raises an exception if user is
not logged in.
It's because of a line 2805 (trunk) in gluon/tools.py:
user_id = self.user.id

What is expected behavior if user is not logged in? Is this
intentional?