ruby-on-rails – 禁用ActiveModel回调

2019年8月1日 190次阅读

我发布了
an article on disabling ActiveModel callbacks,但我不完全确定这是做这样的事情最漂亮的方式.

Mongoid :: Timestamps添加一个更新updated_at字段的保存前回调.假设在某些情况下我不希望这样,我禁用这样的回调：

class User
  # I'm using Mongoid, but this should work for anything based on 
  # ActiveModel.
  include Mongoid::Document
  include Mongoid::Timestamps

  def sneaky_update(attributes)
    User.skip_callback(:save, :before, :set_updated_at)
    User.update_attributes(attributes)
    User.set_callback(:save, :before, :set_updated_at)
  end

end

调用skip_callback后跟set_callback再次设置删除的回调是一个坏主意吗？你会怎么做？ 🙂

最佳答案 这个怎么样？

module Mongoid
  module Timestamps
    attr_accessor :skip_updated_at

    def set_updated_at_new
      unless self.skip_updated_at
        set_updated_at_org
      end
    end

    alias set_updated_at_org set_updated_at
    alias set_updated_at set_updated_at_new
  end
end

class User
  # I'm using Mongoid, but this should work for anything based on 
  # ActiveModel.
  include Mongoid::Document
  include Mongoid::Timestamps

  def sneaky_update(attributes)
    self.skip_updated_at = true
    User.update_attributes(attributes)
    self.skip_updated_at = false
  end

end
点赞