If the code (e.g. iterating user_groups) is in a controller everything is 
fine and the session file is not written. But just put this code

if auth.user_id:
    for role in auth.user_groups.itervalues():
        continue


in db.py of the welcome app after auth.define_tables and the session file 
will be overridden on every request. So the difference is if the session is 
changed (or the pickled session to be more concrete) in a model file or a 
controller.

I've tested this with the welcome app, I can upload it if needed but I 
guess it's not really necessary.

-- 
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- 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)
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