當鞋子合腳時....

controller 這麼寫
    @keywords = params[:keywords]
    @questions = Question.find(:all,
#        :select => "questions.*",
#        :include => {:user },
        :conditions => "questions.subject like '%#{@keywords}%' or questions.body like '%#{@keywords}%'",
        :order => "questions.created_at",
        :limit => 10)

view 裡這麼寫

<ul>
  <% @questions.each do |q| %>
       <% q.tracking.each do |t|%>
      <li><%= t.user_id %> | <%= t.user.login %></li>
<ul>
      <%  t.user.tracking.each do |x| %>
          <li><%= x.trackable_id %></li>
      <% end %>
      </ul>
      <% end %>
  <% end %>
</ul>

可以拿到關聯的資料表裡的資料