定义自定义对象生命周期的钩子红宝石

Question

所以我有一个对象，我想定义一个生命周期挂钩，如before_create，after_create等

我想打电话给这个after_retire并将它安装，所以我可以做以下：

class User < ActiveRecord::Base 
    include Active 
    after_retire :method 

    def method 
    #do stuff 
    end 
end 

到目前为止，我有一个模块的设置，像这样，但我不断收到一个未定义的方法在我的用户模型after_retire错误。

module Active 
    extend ActiveSupport::Concern 

    included do 
    define_callbacks :retire 
    set_callback :retire, :after, :after_retire 
    default_scope { where(:retired => false) } 
    scope :retired, where(:retired => true) 
    end 

    def retire! 
    run_callbacks :retire do 
     update_attribute :retired, true 
     update_attribute :retired_at, Time.now.to_datetime 
    end 
    end 
end 

我该如何设置它？

Answer 1

before/after_callback语法通过#define_model_callbacks在ActiveModel :: Callbacks中处理。原始的ActiveSupport ::回调会要求您使用#set_callback没有任何语法糖：

module Active 
    extend ActiveSupport::Concern 

    included do 
    define_callbacks :retire 
    default_scope { where(:retired => false) } 
    scope :retired, where(:retired => true) 
    end 

    def retire! 
    run_callbacks :retire do 
     update_attribute :retired, true 
     update_attribute :retired_at, Time.now.to_datetime 
    end 
    end 
end 

class User < ActiveRecord::Base 
    include Active 
    set_callback :retire, :after, :method 

    def method 
    #do stuff 
    end 
end 

如果你想有后/语法之前，因为你是用一个ActiveRecord工作（并因此加载ActiveModel）类，您可以使用：

module Active 
    extend ActiveSupport::Concern 

    included do 
    define_model_callbacks :retire 
    default_scope { where(:retired => false) } 
    scope :retired, where(:retired => true) 
    end 

    def retire! 
    run_callbacks :retire do 
     update_attribute :retired, true 
     update_attribute :retired_at, Time.now.to_datetime 
    end 
    end 
end 

class User < ActiveRecord::Base 
    include Active 
    after_retire :method 

    def method 
    #do stuff 
    end 
end