title: How can I make scaffold only for controller and views if model already exists?
body: <p>I already have set up <code>Devise</code> to My App.<br>
  So User model is already generated, and exists by installing <code>Devise</code>  </p>
  
  <p>Now I'd like to add my own controller <code>users_controller.rb</code> and its views <code>index</code> and <code>show</code>.<br>
  How can I make scaffold without affecting to User model that already exists?</p>