presenter for codeschool rails best practices

show_presenter.rb

# /app/presenters/tweets/show.rb
module Tweets
  class ShowPresenter
    def initialize(tweet)
      @tweet = tweet
    end
   
    def tweet
      @tweet
    end
   
    def username
      @tweet.user.username
    end
   
    def favorites_count
      @tweet.favorites.size
    end
   
  end
end

tweets_controller.rb

class TweetsController < ApplicationController

  def show
    @presenter = Tweets::ShowPresenter.new(Tweet.find(params[:id]))
    @tweet = @presenter.tweet
    @username = @presenter.username
    @favorites_count = @presenter.favorites_count
  end

end