状态机after_transition回调不用于更新

Question

我使用的是Rails-4.2.6、state _Mach-1.2.0和Ruby-2.3，我已经在订单模型上定义了状态机。如下所示

  state_machine :status, initial: :initiated do
    after_transition on: :succeeded, do: :oderable_success_callback
    event :pending do
      transition initiated: :pending
    end

    event :failed do
      transition [:initiated, :pending] => :failed
    end

    event :succeeded do
      transition [:initiated, :pending] => :succeeded
    end
  end

  def oderable_success_callback
    orderable.successful_payment
  end

当我按如下方式更新顺序时，将触发after_transition回调。

order.succeeded

但是，当我更新订单时，它不会触发回调

order.update(status: 'succeeded')

status被更新为“succeeded”，，但未能触发回调.

如何在普通after_transition上触发update回调。

Answer 1

order.update将不会触发after_transition回调。如果您想要检测列上的更改。您可以使用模型的after_update回调。

class Order < ActiveRecord::Base
  after_update :tasks
  def tasks
    if(self.status_changed? && status == 'succeeded')
      oderable_success_callback
    end
  end
end

Answer 2

我根据状态进行了多次回调，并避免了多次if/else，如下所示，

 after_update :orderable_callback

 state_machine :status, initial: :initiated do
    event :pending do
      transition initiated: :pending
    end

    event :failed do
      transition [:initiated, :pending] => :failed
    end

    event :succeeded do
      transition [:initiated, :pending] => :succeeded
    end

    state :pending do
      def orderable_callback
        orderable.pending_payment
      end
    end

    state :failed do
      def orderable_callback
        orderable.failed_payment
      end
    end

    state :succeeded do
      def orderable_callback
        orderable.successful_payment
      end
    end
  end