How to select the users'login instead users'name

Question

I know if you write the code :
'aa':fields.many2one('res.users','b',required=True),
,you can select the users'name.
But if I want to selece the users's login (field = login),how can i collect? I try to write like this :
'aa':fields.many2one('res.users.login','b',required=True),
But it also failure..

CK · Answer

Maybe I should write related? like :
'aa':fields.related('login', 'aa', type = 'many2one', ralation ='res.users', string= 'b', required=True),
But it can't work

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