DistroPropaganda/code/rails31/depot_r/app/controllers/application_controller.rb

#---
# Excerpted from "Agile Web Development with Rails",
# published by The Pragmatic Bookshelf.
# Copyrights apply to this code. It may not be used to create training material,
# courses, books, articles, and the like. Contact us if you are in doubt.
# We make no guarantees that this code is fit for any purpose.
# Visit http://www.pragmaticprogrammer.com/titles/rails4 for more book information.
#---
class ApplicationController < ActionController::Base
  before_filter :authorize
  protect_from_forgery
  private

    def current_cart 
      Cart.find(session[:cart_id])
    rescue ActiveRecord::RecordNotFound
      cart = Cart.create
      session[:cart_id] = cart.id
      cart
    end

    # ...

  protected

    def authorize
      unless User.find_by_id(session[:user_id])
        redirect_to login_url, notice: "Please log in"
      end
    end
end