metaprograming in controller or dynamic controller ruby on rails or whatever

crap

class VideosController < ApplicationController 
  before_filter :video, only: [:show, :edit, :update, :watch, :buy, :rent]
  def update 
    authorize! :update, @video 
    if @video.update_attributes params[:video]
      redirect_to @video
    else
      render :edit
    end
  end
  ["watch", "buy", "rent"].each do |a| 
    VideosController.class_eval  do 
      define_method a do
        authorize!(a.to_sym, @video)
        @response = Video.send  a, @video
      end
    end
  end
  private 
  def video
    @video = Video.find params[:id]
  end
end