Cookie based device stragtegy

gistfile1.rb

#devise/cookie_token_auth_strategy
module CookieTokenAuthStrategy
    Warden::Strategies.add(:token_cookie_strategy) do
      def valid?
        token_from_cookie
      end

      def authenticate!
        if token_from_cookie.present? && (user = User.find_for_token_authentication(:auth_token => token_from_cookie)).present?
          delete_token_from_cookie
          success!(user)
        else
          fail!("could not log in")
        end
      end

      def token_from_cookie
        cookies[:authentication_token]
      end

      def delete_token_from_cookie
        cookies.delete(:authentication_token)
      end
  end
end


# app/initializer/devise.rb

  config.warden do |manager|
    manager.default_strategies(:scope => :user).unshift :token_cookie_strategy
  end