Question

我正在使用Rails-4.2.6，state_machine-1.2.0和Ruby-2.3 我在Order模型上定义了状态机。如下

  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

当我更新如下命令时，会触发after_transition回调。

order.succeeded

但是当我将订单更新为

时，它不会触发回调

order.update(status: 'succeeded')

status已更新为“succeeded”，但无法触发回调。

如何在普通after_transition上触发update回调。

Answer 1

order.update 不会触发after_transition回拨。如果要检测列的更改。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

我有多个回调取决于状态，并避免多个if / else，我做了如下，

 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

状态机after_transition回调不工作更新

2 个答案: