如何查找工作流中是否已触发事件

Question

我们在Rails应用程序中使用Geekq/workflow。这里有一个例子：

class Article
  include Workflow
  workflow do
    state :new do
      event :submit, :transitions_to => :awaiting_review
    end
    state :awaiting_review do
      event :review, :transitions_to => :being_reviewed
    end
    state :being_reviewed do
      event :accept, :transitions_to => :accepted
      event :reject, :transitions_to => :rejected
    end
    state :accepted
    state :rejected
  end
end

很容易发现一个状态，例如:awaiting_review是否已经通过：

article.current_state < :awaiting_review

但是，我们没有找到一种方法来检查事件是否已被激发。通过工作流的内置方法，检查事件是否已被触发是可能的吗？或者，如果没有此工作流，其他任何工作流都可以？

Answer 1

因此，您可以捕获on_create和on_cpdate的事件，因为ActiveRecord中存在针对它的回调，但对于工作流中的change_state，您需要通过以下方式覆盖工作流的转换：

class Article < BaseModel
include Workflow
  workflow do
    state :new do
      event :submit, :transitions_to => :awaiting_review
    end
    state :awaiting_review do
      event :review, :transitions_to => :being_reviewed
    end
    state :being_reviewed do
      event :accept, :transitions_to => :accepted
      event :reject, :transitions_to => :rejected
    end
    state :accepted
    state :rejected
    on_transition do |from, to, event, *event_args|
       self.update_attribute(:status, to)
       # this triggers on_update callback on workflow transition
       # which you can use to log the event now
    end
  end
end
class BaseModel < ActiveRecord
  after_commit :log_create_event, on: [:create]
  after_commit :log_update_event, on: [:update]
  after_commit :log_destroy_event, on: [:destroy]
  def log_create_event
    #log_event('Create')
  end
  def log_update_event
    #log_event('Update')
  end
  def log_destroy_event
    #log_event('Destroy')
  end
end