aasm 交换机 订单状态交换功能

使用：

1. gem 'aasm'

2.设置一个初始状态

class Customer < ActiveRecord::Base
    include AASM

    aasm  do
        state :published, initial => true
        state :checked_success
        state :checked_faild
    end
end

3.状态转换
初始状态为published(未审核)，审核通过，则为checked，审核未通过，则为denied。

  class Customer < ActiveRecord::Base
    include AASM

    aasm  do
        state :published, initial => true
        state :checked_success
        state :checked_faild
        state :deleted
        
        #正在审核
        event :on_checked do
              translation :from => :published, :to => :on_checking
         end

          #审核通过
          event :checked_succeed do 
              translation :from => :on_checking, :to  => :finished
          end
          
          #删除该记录
          event :deleted do
              translation :from => [:checked, :finished], :to => :sleeping
          end

    end
end

触发切换事件执行的条件 after_commit: :事件