Question

我在rails 4应用程序中使用aasm（以前称为acts_as_state_machine）gem。我的Post模型

上有类似的内容

  ...
  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)并触发后回调时，在我的控制台中，我可以检查user是什么（传递到Proc中），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

在章节回调中查看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）：

Document

Answer 3

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

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

block to bang method will be call after transition success, if any activerecord operation, it will be wrap into transition transaction, your can require a lock to prevent concurrency problem with option requires_lock: true.

用参数回调后的aasm

3 个答案: