Agile Web Development with Rails, Edition 4

9.1 Iteration D1: Finding a Cart

Create a cart. Put it in a session. Find it.

Create a cart.

rails generate scaffold Cart

      invoke  active_record

      create    db/migrate/20140204204127_create_carts.rb

      create    app/models/cart.rb

      invoke    test_unit

      create      test/unit/cart_test.rb

      create      test/fixtures/carts.yml

       route  resources :carts

      invoke  scaffold_controller

      create    app/controllers/carts_controller.rb

      invoke    erb

      create      app/views/carts

      create      app/views/carts/index.html.erb

      create      app/views/carts/edit.html.erb

      create      app/views/carts/show.html.erb

      create      app/views/carts/new.html.erb

      create      app/views/carts/_form.html.erb

      invoke    test_unit

      create      test/functional/carts_controller_test.rb

      invoke    helper

      create      app/helpers/carts_helper.rb

      invoke      test_unit

      create        test/unit/helpers/carts_helper_test.rb

      invoke  stylesheets

   identical    public/stylesheets/scaffold.css

rake db:migrate

mv 20140204204127_create_carts.rb 20140204000002_create_carts.rb

==  CreateCarts: migrating ====================================================

-- create_table(:carts)

   -> 0.0008s

==  CreateCarts: migrated (0.0008s) ===========================================

Implement set_cart, which creates a new cart if it can't find one.

edit app/controllers/application_controller.rb

class ApplicationController < ActionController::Base

  protect_from_forgery

  private

    def set_cart

      @cart = Cart.find(session[:cart_id])

    rescue ActiveRecord::RecordNotFound

      @cart = Cart.create

      session[:cart_id] = @cart.id

end

end