Question

state_machine :device_state, :attribute => :device_state, :initial => :unregistered do
    state :unregistered
    state :registered
    state :compliancy_pending
    state :not_compliant
    state :end_of_contract

    after_transition all => :registered do |device, transition|
      device.update_attributes! :gcm_error => nil
    end

    after_failure do |device, transition|
      Rails.logger.warn "Device #{device.serial_number} failed to transition on #{transition.event} with state #{transition.from_name}"
    end

    event :unregister_device do
      transition all => :unregistered
    end

    event :end_of_contract_device do
      transition all => :end_of_contract
    end

    event :register_device do
      transition [:unregistered, :registered] => :registered
      transition :compliancy_pending => :compliancy_pending
      transition :not_compliant => :not_compliant
    end

    event :requires_dispatch do
      transition [:registered, :compliancy_pending, :not_compliant] => :registered
    end

    event :dispatching do
      transition :registered => :compliancy_pending
      transition [:compliancy_pending] => :compliancy_pending, :unless => :notification_timed_out?
      transition [:registered, :compliancy_pending] => :not_compliant, :if => :notification_timed_out? #gcm_timed_out
    end

    event :device_responded do
      transition [:registered, :not_compliant, :compliancy_pending] => :registered
    end
  end

以上是状态机，此模型中也指定了事件。这个模型是device.rb

但是我想从end_of_contract模型中激活一个事件。

请告诉我如何在另一个模块中使用此状态机来更新状态。

描述：有一个名为device_state的列，属于设备模型（device.rb）。我还有一个模型end_of_contract.rb和end_of_contractscontroller.rb。但我的任务是，当我调用end_of_contract操作时，它应该触发device.rb中存在的事件，然后应该将此device.rb中的状态更改为end_of_contract。

最后，我是铁杆新手。。

Answer 1

只要您拥有设备实例，就应该能够从任何地方调用该事件，例如

@device = Device.find(params[:device_id])
@device.end_of_contract_device

如何从模型A中出现的模型B中触发事件

1 个答案: