还是缓存问题

app/views/welcome/index.html.erb

@@ -123,7 +123,6 @@
 		</div>
 		<div class="welcome-box-list-new memo_activity">
 			<% topics = find_new_forum_topics(12) %>
-            <% cache topics.maximum(:created_at) do%>
 		    <% topics.includes(:forum, :last_reply, :author).each do |topic|%>
                 <li class="message-brief-intro" style="line-height:1.4em;">
                     <div class='memo_title text_nowrap'>
@@ -153,10 +152,9 @@
                     </div>
                 </li>
               <% end %>
-            <% end %>
 		</div>
 	</ul>
 </div>
 
 <div class="clearfix"></div>
-<%= render partial: 'link_to_another' %>
+<%= render partial: 'link_to_another' %>