ruby-on-rails - 带参数回调后的aasm

Question

我在我的 rails 4 应用程序中使用aasm（以前的）gem。acts_as_state_machine我的Post模型上有这样的东西

  ...
  aasm column: :state do
    state :pending_approval, initial: true
    state :active
    state :pending_removal

    event :accept_approval, :after => Proc.new { |user| binding.pry } do
      transitions from: :pending_approval, to: :active
    end
  end
  ...

当我调用@post.accept_approval!(:active, current_user)并且触发后回调时，在我的控制台中我可以检查什么user是（传递给 Proc）并且它是nil！

这里发生了什么？调用此转换的正确方法是什么？

Answer 1

在部分回调中查看 aasm 文档。

...
  aasm column: :state do
    state :pending_approval, initial: true
    state :active
    state :pending_removal

    after_all_transition :log_all_events

    event :accept_approval, after: :log_approval do
      transitions from: :pending_approval, to: :active
    end
  end
  ...
  del log_all_events(user)
    logger.debug "aasm #{aasm.current_event} from #{user}"
  end

  def log_approval(user)
    logger.debug "aasm log_aproove from #{user}"
  end

您可以使用所需的参数调用事件：

  @post.accept_approval! current_user

Answer 2

它适用于当前版本（4.3.0）：

event :finish do
  before do |user|
    # do something with user
  end

  transitions from: :active, to: :finished
end

Answer 3

event :accept_approval do
  transitions from: :pending_approval, to: :active
end

post.accept_approval!{post.set_approvaler(current_user)}

转换成功后将调用 block to bang 方法，如果有任何 activerecord 操作，它将被包装到转换事务中，您可以要求锁定以防止选项的并发问题 requires_lock: true。