ruby-on-rails - 如何仅在 aasm 中为特定转换设置回调？

Question

我有两个事件:

event :event1, after: :event2! do
  transitions to: :state2, from: :state1, guard: proc {some func}
  transitions to: :state3, from: :state1
end    

event :event2 do
  transitions to: :state3, from: state2, guard: proc {some func}
end

如何仅在 event1 中设置第一次转换后的回调？ (我无法将第二次转换替换为其他事件)

我试过了

event :event1 do
  transitions to: :state2, from: :state1, after: :event2!, guard: proc {some func}
  transitions to: :state3, from: :state1
end 

但是没有效果

Answer 1

我不确定我是否准确地理解了你。你只想在这个转换之后运行 event2:transitions to: :state2, from: :state1, guard: proc {some func} ，对吧？

event :event1 do
  transitions to: :state2, from: :state1, :after => Proc.new {|*args| set_process(*args) } , guard: proc {some func}
  transitions to: :state3, from: :state1
end 

def set_process(name)
  event2!
end

或者试试这个。

event :event1 do
  transitions to: :state2, from: :state1, guard: proc {some func}
  transitions to: :state3, from: :state1
  after do
    event2! if self.state2?
  end
end    

event :event2 do
  transitions to: :state3, from: state2, guard: proc {some func}
end

这段代码意味着，当 guard 返回 true 时，它​​将进行第一次转换，否则进行第二次转换。转换后，如果它是 state2，它将进行 event2。您可以在 aasm 找到更多详细信息。 .

In the event of having multiple transitions for an event, the first transition that successfully completes will stop other transitions in the same event from being processed.

您可以在回调中编写任何代码，就像 rails 回调一样。