Rails - Jul 2014 - How make Rabl works with ActionController::Metal

I've took this post 
<http://railsware.com/blog/2013/04/08/api-with-ruby-on-rails-useful-tricks/>
like
basis but receive empty response every time. What's wrong?

Basic controller:

class Api::V1::BaseController < ActionController::Metal
  include AbstractController::Rendering
  include AbstractController::Callbacks
  include AbstractController::Helpers

  include ActionController::HttpAuthentication::Token::ControllerMethods
  include ActionController::Rendering
  include ActionController::Renderers::All
  include ActionController::MimeResponds
  include ActionController::Instrumentation

  append_view_path "#{Rails.root}/app/views"

  respond_to :json
end

Controller:

class Api::V1::UsersController < Api::V1::BaseController

  def index
    @user = User.find(params[:id])
  end
end

RABL template:

object @user

attributes :first_name


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