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

我非常不喜欢我的状态机定义与我的类定义混合在一起的事实（因为在实际项目中我当然会向 Job 类添加更多方法）。

我想在一个模块中分离状态机定义，以便 Job 类可以是：

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 包含在模块中而不是 Job 类中...我什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

但它仍然无法正常工作......非常感谢任何提示或建议。

谢谢， 伊格纳齐奥

---

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

显然记得在主类中包含状态机定义，如下所示：

include StateMachine::JobStateMachine

Answer 1

你不能简单地做到这一点吗？

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

    aasm do
      ...
    end
  end
end