Acts As Taggable On Steroids
参考着mephisto写blog程序,第一次看到[].collect(&:name)的写法,别笑我……书上没见过,代码又写得少,结果就是这样。=============================================
答案在这里:http://www.infoq.com/cn/articles/ruby-open-classes-monkeypatching
主要记录一下acts_as_taggable_on_steroids的用法。
http://agilewebdevelopment.com/plugins/acts_as_taggable_on_steroids
首先,安装这个插件到项目中:
ruby script/plugin install git://github.com/jviney/acts_as_taggable_on_steroids.git
使用
接着,执行:
ruby script/generate acts_as_taggable_on_steroids_migration
会生成如下migration代码:
class ActsAsTaggableMigration < ActiveRecord::Migrationdef self.up create_table :tags do |t| t.column :name, :string end create_table :taggings do |t| t.column :tag_id, :integer t.column :taggable_id, :integer # You should make sure that the column created is # long enough to store the required class names. t.column :taggable_type, :string t.column :created_at, :datetime end add_index :taggings, :tag_id add_index :taggings, [:taggable_id, :taggable_type]enddef self.down drop_table :taggings drop_table :tagsendend
这里建了两个表,tag表和taggings表。taggings表看着像是个多对多的连接表,另外多了个taggable_type字段,估计是要做成不同类型的taggable对象都能通用的吧。
然后……只要在需要tag的类里边加一句acts_as_taggalbe的调用就可以了……自己不用插件瞎搞了大半天的东东,两三个命令加一句代码解决了。嗯?居然没有Tag类,估计隐藏在插件内部了。grep一下:
grep 'class Tag' ./ -r
果然……
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