ruby -- 进阶学习（十五）friendly

ruby -- 进阶学习（十五）friendly_id配置

实现效果：http://127.0.0.1:3000/article/1 => http://127.0.0.1:3000/article/书名

（1）Rails 4.0的friendly_id的版本必须是5.0以上。在Gemfile中加入，

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

（2）运行，

rails g migration add_slug_to_articles slug:string
rake db:migrate

（3）db/migrate/add_slug_to_articles.rb

add_column :articles, :slug, :string
add_index :articles, :slug

（4）models/article.rb

class Article < ActiveRecord::Base
  extend FriendlyId
  friendly_id :name, :use => :slugged

  def should_generate_new_friendly_id?
    new_record?
  end
end