Question

使用状态机进行简单的订单处理，只想在每个事件后记录DB中的更改。也许有人对如何重构这个有任何想法：所以我不需要很多记录方法和after_transition

def record
   self.status_transition.update(:event => "placed", :from => "draft" , :to => "placed" )
end

def record_cancel
   self.status_transition.update(:event => "canceled", :from => "placed" , :to => "draft" )
end

state_machine initial: :draft do
state :draft, value: 0
state :placed, value: 1
state :paid, value: 2
state :canceled, value: 3
after_transition :on => :place, :do => :record
after_transition :on => :cancel, :do => :record_cancel


event :place do 
  transition :draft => :placed
end
event :cancel do 
  transition :placed => :draft
end
event :pay do 
  transition :placed => :paid
end
end

Answer 1

您可以定义一般转换回调，例如

after_transition any => any do |order, transition|
  order.status_transition.update(event: transition.event,
                                 from:  transition.from, 
                                 to:    transition.to)
end

有关可以在transition块参数上调用的方法，请参阅StateMachine::Transition。

rails state_machine重构

1 个答案: