controller_with_facade.rb

class FilmsController < ApplicationController
  def index
    @films = serialized_films
    render json: @films
  end

  private

  def films_scope
    Film.all
  end

  def serialized_films
    FilmCarrier.wrap(films_scope).map do |film|
      { title: film.title, genre: film.genre, rate: film.avg_rating }
    end
  end
end