Thanks for the response. BTW I am trying to change my system from username 
login to email login, AND at the same time I want those old (existing) users to 
continue using username to login. So I end up using username, but with a 
IS_EMAIL() validator. Is there any side effect for that?

Anthony <[email protected]> wrote:

>Yes, seems like a bug. I guess no one uses this setting (probably because it's 
>not documented).
>
>
>Anthony
>
>On Sunday, April 6, 2014 3:02:41 PM UTC-4, Ray (a.k.a. Iceberg) wrote:
>
>
>
>On Sunday, April 6, 2014 12:03:59 AM UTC-7, Ray (a.k.a. Iceberg) wrote:
>
>Just want to double confirm.
>
>1. I found many following lines in tools.py:
>
>        userfield = self.settings.login_userfield or 'username' \
>            if 'username' in table_user.fields else 'email'
>
>it means:
>
>        if 'username' in table_user.fields:
>            userfield = self.settings.login_userfield or 'username'
>        else:
>            userfield = 'email
>
>
>2. If we used a slightly different source code like this:
>
>        userfield = self.settings.login_userfield or ('username'
>            if 'username' in table_user.fields else 'email')
>
>it means something quite different:
>
>        if self.settings.login_userfield:  # if user explicitly define the 
>login_userfield
>            userfield = self.settings.login_userfield  # then use it 
>unconditionally
>        else:   # otherwise automatically determine one
>            userfield = 'username' if 'username' in table_user.fields else 
>'email'
>
>
>So, to double confirm, what is the design purpose of 
>auth.settings.login_userfield? If it is #1, I recommend to use a pair of 
>brackets to avoid misunderstanding.
>
>        userfield = (self.settings.login_userfield or 'username'
>            ) if 'username' in table_user.fields else 'email'
>
>
>Well, now I believe the #2 purpose is the design intention, based on this 
>section in Auth.register():
>
>        table_user = self.table_user()
>        if self.settings.login_userfield:
>            username = self.settings.login_userfield
>        elif 'username' in table_user.fields:
>            username = 'username'
>        else:
>            username = 'email'
>
>In this case, I believe #1 is a bug and need to be fixed. 
>
>-- 
>Resources:
>- 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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