new methods in each object

gistfile1.rb

#USER//////////////////////////////////////
  def update_search_data_index
    if username_changed? || name_changed?
      search_data = username.dup << " " << (name || "")
      ObserverSearchData.new(self, search_data).update_index
    end
  end

#TOPIC//////////////////////////////////////
  def update_search_data_index
    if title_changed? && posts
      post = posts.where(post_number: 1).first
      if post
        search_data = post.scrubbed_html << " " << title
        search_data << " " << category.name if category
        ObserverSearchData.new(post, search_data).update_index
      end
    end
  end


#CATEGORY//////////////////////////////////////
  def update_search_data_index
    ObserverSearchData.new(self, name).update_index if name_changed?
  end



#POST//////////////////////////////////////
  def update_search_data_index
    if cooked_changed?
      search_data = scrubbed_html << " " << topic.title
      search_data << " " << topic.category.name if topic.category
      ObserverSearchData.new(self, search_data).update_index
    end
  end