带参数的回调后的aasm

Question

我在Rails 4应用程序中使用了aasm（以前称为acts_as_state_machine）gem。我的Post模特上有这样的东西

  ...
  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after回调时，在我的控制台中，我可以检查什么user（已传递到Proc中）及其nil！

这里发生了什么？调用此转换的正确方法是什么？

Answer 1

在回调部分中查看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