是否有可能获得在rails中触发回调的关联对象？

Question

假设我有一个包含许多帖子的内容对象，其中Post对象的属性委托给Content。因此，当我编辑一个帖子并保存它时，它会更新相关的内容对象，而后者又会更新所有其他可能与之关联的帖子，我试图避免的是帖子的情况引发内容更新回调的内容也会在内容回调中更新。这可能吗？

class Content > ActiveRecord::Base
    has_many :posts
    after_save :update_posts
    def update_posts
        #I'd like to make sure the post that kicked off the save doesn't get reindexed here
        self.posts.each{|x| x.update_search_index}
    end
end

class Post > ActiveRecord::Base
    belongs_to :Content
    after_save :update_content, :update_search_index

    def save_content
        self.content.save #this kicks off an aftersave callback on content that winds up recalling update_search_index, I'm trying to avoid that
    end

    def update_search_index
      #persist post to search index
    end
end