AASM:将状态机定义与类定义分开

Question

假设我有这个类(直接取自aasm文档):

class Job < ActiveRecord::Base
  include AASM

  aasm do
    state :sleeping, :initial => true
    state :running
    state :cleaning

    event :run do
      transitions :from => :sleeping, :to => :running
    end

    event :clean do
      transitions :from => :running, :to => :cleaning
    end

    event :sleep do
      transitions :from => [:running, :cleaning], :to => :sleeping
    end
  end

end

我不喜欢我的状态机定义与我的类定义混合的事实(因为当然在实际项目中我会向Job类添加更多方法).

我想在模块中分离状态机定义,以便Job类可以是以下内容:

class Job < ActiveRecord::Base
  include StateMachines::JobStateMachine
end

然后我在app/models/state_machines中创建了一个job_state_machine.rb文件,其内容类似于:

module StateMachines::JobStateMachine
  include AASM

  aasm do
    state :sleeping, :initial => true
    state :running
    state :cleaning

    event :run do
      transitions :from => :sleeping, :to => :running
    end

    event :clean do
      transitions :from => :running, :to => :cleaning
    end

    event :sleep do
      transitions :from => [:running, :cleaning], :to => :sleeping
    end
  end

end

但这不起作用,因为AASM被包含在不在Job类中的模块中......我甚至尝试将模块更改为:

module StateMachines::JobStateMachine
  def self.included(base)
  include AASM

  aasm do
    state :sleeping, :initial => true
    state :running
    state :cleaning

    event :run do
      transitions :from => :sleeping, :to => :running
    end

    event :clean do
      transitions :from => :running, :to => :cleaning
    end

    event :sleep do
      transitions :from => [:running, :cleaning], :to => :sleeping
    end
  end
  end
end

但它仍然没有工作......任何提示或建议都非常感激.

谢谢,Ignazio

---

编辑:

感谢Alto,正确的解决方案是:

module StateMachine::JobStateMachine

  def self.included(base)
    base.send(:include, AASM)

    base.send(:aasm, column: 'status') do
    ....
    end
  end
end

并且显然要记得在主类中包含状态机定义,如下所示:

include StateMachine::JobStateMachine

Answer 1

难道你不能这么简单吗？

module StateMachines::JobStateMachine
  def self.included(base)
    base.send(:include, AASM)

    aasm do
      ...
    end
  end
end