The document discusses the Acts As gem which allows classes to act as reviewable objects. It shows how to generate a Review model with a polymorphic association to a reviewable object. It then defines a Reviewable module to make classes reviewable and adds reviewable functionality. Examples are given of creating reviews for a Product object and accessing its reviews.

1. ACTS AS André Tagliati @tagliati http://www.tagliati.com.br [email_address]

2. Tagliati E @makotovh papagaio de pirata

3. http://www.cowboycoded.com/tag/acts_as/ http://www.flickr.com/photos/loop_oh/3338084111/

4. DRY DONT REPEAT YOURSELF DRY http://www.flickr.com/photos/vorty/850290006/

5. Review Ou Acts as Reviewable REVIEWABLE

6. Hands On Vamos ver como é isso. HANDS ON http://www.flickr.com/photos/jurvetson/489257240/

7. rails g model review review_text:text t.references :reviewable , :polymorphic => true

8. Ali! No teto! Polymorphic!!!! Me enganei. É só um PomboRanger.

9. class Review < ActiveRecord::Base belongs_to :reviewable , :polymorphic => true end module Reviewable def is_reviewable has_many :reviews , :as => :reviewable , :dependent => :destroy include InstanceMethods end module InstanceMethods def reviewable? true end end end ActiveRecord::Base.extend Reviewable

10. class Produto < ActiveRecord::Base is_reviewable end class Categoria < ActiveRecord::Base is_reviewable end class Artigo < ActiveRecord::Base is_reviewable end

11. http://www.flickr.com/photos/80835774@N00/5442336248/ hehaEHAEHaeHe haHeAHeAHeAHe HAEhae Assim fica fácil!

12. product = Product.new => # product.reviewable? => true product.reviews => [] #nenhum review ainda product.save product.reviews.create(review_text: &quot;test&quot;) => #<Review id: 1, reviewable_type: &quot;Product&quot;, reviewable_id: 101 ....> product.reviews.size => 1

13. BLOCOS

14. Dúvidas?