RubyChina如何实现软删除?

1. 在model层新建一个Module
   

   # coding: utf-8
   # 软删除
   module Mongoid
     module SoftDelete
       extend ActiveSupport::Concern
   
       included do
         field :deleted_at, :type => DateTime
   
         default_scope where(:deleted_at => nil)
         alias_method :destroy!, :destroy
       end 
   
       def destroy
         if persisted?
           self.update_attribute(:deleted_at,Time.now.utc)
         end 
   
         @destroyed = true
         freeze
       end 
     end 
   end
   

   
   
   
2. 在模型中引用这个module
   

     include Mongoid::SoftDelete

   
   
3. 如果是Mysql数据库，需要定义deleted_at字段