title: using user_name for login in devise
body: <p>I want to use devise for my authentication and instead of having e-mail as the login i want users to user their user names</p>
  
  <p>for that </p>
  
  <p>I have added user_name to the users table
  added to the User model attr_accessible :email, :password, :password_confirmation, :remember_me, :user_name</p>
  
  <p>and also config.authentication_keys = [ :user_name ] in '/intilizers/devise.rb'</p>
  
  <p>But my question is how can i skip the e-mail validation and have user_name instead</p>
  
  <p>I'm using rails3 and device 1.1.8</p>
  
  <p>thanks in advance</p>
  
  <p>cheers</p>
  
  <p>sameera</p>