Rails 4.0--friendly_idの配置

Rails 4.0--friendly_idの配置
実現効果:http://127.0.0.1:3000/article/1  =>  http://127.0.0.1:3000/article/書名
（1）Rails 4.0のフレンドリー_idのバージョンは5.0以上でなければなりません。Gemfileに加入し、

gem 'friendly_id','~> 5.0.0.beta'

（2）運転、

rails g migration add_slug_to_articles slug:string

rake db:migrate

（3）db/migrate/add_スラグ.to_articales.rb 

add_column :articles, :slug, :string

add_index :articles, :slug

(4)models/articale.rb 

class Article < ActiveRecord::Base

  extend FriendlyId

  friendly_id :name, :use => :slugged



  def should_generate_new_friendly_id?

    new_record?

  end

end

関連リンク:
http://railscasts.com/episodes/314-pretty-urls-with-friendlyid
http://railscasts.com/episodes/314-pretty-urls-with-friendlyid?view=asciicast