Simple relationship

Create the application.

ruby -rubygems /home/rubys/git/rails/bin/rails new depot

      create

      create  README

      create  Rakefile

      create  config.ru

      create  .gitignore

      create  Gemfile

      create  app

      create  app/controllers/application_controller.rb

      create  app/helpers/application_helper.rb

      create  app/mailers

      create  app/models

      create  app/views/layouts/application.html.erb

      create  config

      create  config/routes.rb

      create  config/application.rb

      create  config/environment.rb

      create  config/environments

      create  config/environments/development.rb

      create  config/environments/production.rb

      create  config/environments/test.rb

      create  config/initializers

      create  config/initializers/backtrace_silencers.rb

      create  config/initializers/inflections.rb

      create  config/initializers/mime_types.rb

      create  config/initializers/secret_token.rb

      create  config/initializers/session_store.rb

      create  config/locales

      create  config/locales/en.yml

      create  config/boot.rb

      create  config/database.yml

      create  db

      create  db/seeds.rb

      create  doc

      create  doc/README_FOR_APP

      create  lib

      create  lib/tasks

      create  lib/tasks/.gitkeep

      create  log

      create  log/server.log

      create  log/production.log

      create  log/development.log

      create  log/test.log

      create  public

      create  public/404.html

      create  public/422.html

      create  public/500.html

      create  public/favicon.ico

      create  public/index.html

      create  public/robots.txt

      create  public/images

      create  public/images/rails.png

      create  public/stylesheets

      create  public/stylesheets/.gitkeep

      create  public/javascripts

      create  public/javascripts/application.js

      create  public/javascripts/controls.js

      create  public/javascripts/dragdrop.js

      create  public/javascripts/effects.js

      create  public/javascripts/prototype.js

      create  public/javascripts/rails.js

      create  script

      create  script/rails

      create  test

      create  test/fixtures

      create  test/functional

      create  test/integration

      create  test/performance/browsing_test.rb

      create  test/test_helper.rb

      create  test/unit

      create  tmp

      create  tmp/sessions

      create  tmp/sockets

      create  tmp/cache

      create  tmp/pids

      create  vendor/plugins

      create  vendor/plugins/.gitkeep

bundle install

Using rake (0.8.7)

Using abstract (1.0.0)

Using activesupport (3.0.7) from source at /home/rubys/git/rails

Using builder (2.1.2)

Using i18n (0.5.0)

Using activemodel (3.0.7) from source at /home/rubys/git/rails

Using erubis (2.6.6)

Using rack (1.2.2)

Using rack-mount (0.6.14)

Using rack-test (0.5.7)

Using tzinfo (0.3.27)

Using actionpack (3.0.7) from source at /home/rubys/git/rails

Using mime-types (1.16)

Using polyglot (0.3.1)

Using treetop (1.4.9)

Using mail (2.2.19)

Using actionmailer (3.0.7) from source at /home/rubys/git/rails

Using arel (2.0.9)

Using activerecord (3.0.7) from source at /home/rubys/git/rails

Using activeresource (3.0.7) from source at /home/rubys/git/rails

Using bundler (1.0.12)

Using thor (0.14.6)

Using railties (3.0.7) from source at /home/rubys/git/rails

Using rails (3.0.7) from source at /home/rubys/git/rails

Using sqlite3 (1.3.3)

Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.

Generating our first model and associated scaffolding

rails generate scaffold product title:string

      invoke  active_record

      create    db/migrate/20110509143208_create_products.rb

      create    app/models/product.rb

      invoke    test_unit

      create      test/unit/product_test.rb

      create      test/fixtures/products.yml

       route  resources :products

      invoke  scaffold_controller

      create    app/controllers/products_controller.rb

      invoke    erb

      create      app/views/products

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

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

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

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

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

      invoke    test_unit

      create      test/functional/products_controller_test.rb

      invoke    helper

      create      app/helpers/products_helper.rb

      invoke      test_unit

      create        test/unit/helpers/products_helper_test.rb

      invoke  stylesheets

      create    public/stylesheets/scaffold.css

Create a second controller with a single index action

rails generate controller store index

      create  app/controllers/store_controller.rb

       route  get "store/index"

      invoke  erb

      create    app/views/store

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

      invoke  test_unit

      create    test/functional/store_controller_test.rb

      invoke  helper

      create    app/helpers/store_helper.rb

      invoke    test_unit

      create      test/unit/helpers/store_helper_test.rb

Create a cart.

rails generate scaffold cart

      invoke  active_record

      create    db/migrate/20110509143209_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

Create an order.

rails generate scaffold order

      invoke  active_record

      create    db/migrate/20110509143210_create_orders.rb

      create    app/models/order.rb

      invoke    test_unit

      create      test/unit/order_test.rb

      create      test/fixtures/orders.yml

       route  resources :orders

      invoke  scaffold_controller

      create    app/controllers/orders_controller.rb

      invoke    erb

      create      app/views/orders

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

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

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

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

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

      invoke    test_unit

      create      test/functional/orders_controller_test.rb

      invoke    helper

      create      app/helpers/orders_helper.rb

      invoke      test_unit

      create        test/unit/helpers/orders_helper_test.rb

      invoke  stylesheets

   identical    public/stylesheets/scaffold.css

Create the relationship object.

rails generate scaffold line_item product_id:integer cart_id:integer order_id:integer

      invoke  active_record

      create    db/migrate/20110509143211_create_line_items.rb

      create    app/models/line_item.rb

      invoke    test_unit

      create      test/unit/line_item_test.rb

      create      test/fixtures/line_items.yml

       route  resources :line_items

      invoke  scaffold_controller

      create    app/controllers/line_items_controller.rb

      invoke    erb

      create      app/views/line_items

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

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

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

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

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

      invoke    test_unit

      create      test/functional/line_items_controller_test.rb

      invoke    helper

      create      app/helpers/line_items_helper.rb

      invoke      test_unit

      create        test/unit/helpers/line_items_helper_test.rb

      invoke  stylesheets

   identical    public/stylesheets/scaffold.css

Cart has many line items.

edit app/models/cart.rb

class Cart < ActiveRecord::Base

  has_many :line_items, :dependent=>:destroy

end

Order has many line items.

edit app/models/order.rb

class Order < ActiveRecord::Base

  has_many :line_items, :dependent=>:destroy

end

Product has many line items.

edit app/models/product.rb

class Product < ActiveRecord::Base

  has_many :line_items

end

Line item belongs to both Product and either a Cart or Order

edit app/models/line_item.rb

class LineItem < ActiveRecord::Base

  belongs_to :product

  belongs_to :cart

  belongs_to :order

end

Custom logic for creating a cart from an order

edit app/controllers/orders_controller.rb

  def create

    cart = Cart.find_by_id(params[:cart_id])

    @order = Order.new(params[:order])

    # move line items from cart to order

    cart.line_items.each do |item|

      item.cart_id = nil

      @order.line_items << item

end

    respond_to do |format|

      if @order.save

        Cart.destroy(params[:cart_id])

        format.html { redirect_to(@order, :notice => 'Order was successfully created.') }

        format.xml  { render :xml => @order, :status => :created, :location => @order }

      else

        format.html { render :action => "new" }

        format.xml  { render :xml => @order.errors, :status => :unprocessable_entity }

end

end

end

rake db:migrate

mv 20110509143208_create_products.rb 20110211000001_create_products.rb

mv 20110509143209_create_carts.rb 20110211000002_create_carts.rb

mv 20110509143210_create_orders.rb 20110211000003_create_orders.rb

mv 20110509143211_create_line_items.rb 20110211000004_create_line_items.rb

(in /home/rubys/tmp/work-30/depot)

==  CreateProducts: migrating =================================================

-- create_table(:products)

   -> 0.0015s

==  CreateProducts: migrated (0.0016s) ========================================

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

-- create_table(:carts)

   -> 0.0012s

==  CreateCarts: migrated (0.0013s) ===========================================

==  CreateOrders: migrating ===================================================

-- create_table(:orders)

   -> 0.0012s

==  CreateOrders: migrated (0.0013s) ==========================================

==  CreateLineItems: migrating ================================================

-- create_table(:line_items)

   -> 0.0017s

==  CreateLineItems: migrated (0.0018s) =======================================

Start the server.

Create a product

get /products/new

New product

Back

post /products

product[title] => Pragmatic Version Control

You are being redirected.

get http://localhost:3000/products/1

Product was successfully created.

Title: Pragmatic Version Control

Edit | Back

Create a cart

get /carts/new

New cart

Back

post /carts

You are being redirected.

get http://localhost:3000/carts/1

Cart was successfully created.

Edit | Back

Connect the two

get /line_items/new

New line_item

Back

post /line_items

line_item[cart_id] => 1
line_item[product_id] => 1

You are being redirected.

get http://localhost:3000/line_items/1

Line item was successfully created.

Product: 1

Cart: 1

Order:

Edit | Back

Show the line item

sqlite3> select * from line_items

        id = 1

product_id = 1

   cart_id = 1

  order_id =

created_at = 2011-05-09 14:32:21.504287

updated_at = 2011-05-09 14:32:21.504287

Create an order from a cart

post /orders

cart_id => 1

You are being redirected.

get http://localhost:3000/orders/1

Order was successfully created.

Edit | Back

Show the line item

sqlite3> select * from line_items

        id = 1

product_id = 1

   cart_id =

  order_id = 1

created_at = 2011-05-09 14:32:21.504287

updated_at = 2011-05-09 14:32:21.980281

Environment

Mon, 09 May 2011 14:32:22 GMT

echo $PATH

/home/rubys/.rvm/gems/ruby-1.8.7-p334/bin:/home/rubys/.rvm/gems/ruby-1.8.7-p334@global/bin:/home/rubys/.rvm/rubies/ruby-1.8.7-p334/bin:/home/rubys/.rvm/bin:/home/rubys/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games

node -v

v0.2.6

/home/rubys/.rvm/rubies/ruby-1.8.7-p334/bin/ruby -v

ruby 1.8.7 (2011-02-18 patchlevel 334) [x86_64-linux]

gem -v

1.6.2

bundle show

Gems included by the bundle:

  * abstract (1.0.0)

  * actionmailer (3.0.7)

  * actionpack (3.0.7)

  * activemodel (3.0.7)

  * activerecord (3.0.7)

  * activeresource (3.0.7)

  * activesupport (3.0.7)

  * arel (2.0.9)

  * builder (2.1.2)

  * bundler (1.0.12)

  * erubis (2.6.6)

  * i18n (0.5.0)

  * mail (2.2.19)

  * mime-types (1.16)

  * polyglot (0.3.1)

  * rack (1.2.2)

  * rack-mount (0.6.14)

  * rack-test (0.5.7)

  * rails (3.0.7 9575db6)

  * railties (3.0.7)

  * rake (0.8.7)

  * sqlite3 (1.3.3)

  * thor (0.14.6)

  * treetop (1.4.9)

  * tzinfo (0.3.27)

rake about

(in /home/rubys/tmp/work-30/depot)

About your application's environment

Ruby version              1.8.7 (x86_64-linux)

RubyGems version          1.6.2

Rack version              1.2

Rails version             3.0.7

Active Record version     3.0.7

Action Pack version       3.0.7

Active Resource version   3.0.7

Action Mailer version     3.0.7

Active Support version    3.0.7

Application root          /home/rubys/tmp/work-30/depot

Environment               development

git log -1

commit 9575db644396af54fd60f92eb8f81997b3e46941

Author: José Valim <jose.valim@gmail.com>

Date:   Fri May 6 18:42:06 2011 +0200

    Revert "Pass the proper method_name instead of hardcoding to action_name."

    This commit was actually correct. The first parameter in process_action

    is not necessarily the same as the action_name. Use action_name to

    retrieve the action instead.

    This reverts commit 4e2bacdf7cbece8225552e64358fb53ad6b70540.