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Finally, if the customization at the views level is not enough, you can customize each controller by following these steps:

  1) Create your custom controller, for example a Admins::SessionsController:

    class Admins::SessionsController < Devise::SessionsController
    end

  2) Tell the router to use this controller:

    devise_for :admins, :controllers => { :sessions = "admin/sessions" }

  3) And finally, since we changed the controller, it won't use "devise/sessions" as views anymore, so remember to make a copy of "devise/sessions" to "admin/sessions".

Remember that Devise uses flash messages to let users know if sign in wass successful or not. Devise expects your application to call "flash[:notice]" and "flash[:alert]" as appropriate.