去掉 head 里面的 cache，有问题;

Author: huacnlee

app/views/layouts/application.html.erb

@@ -19,22 +19,18 @@
   <%= render_page_title %>
   <meta charset='utf-8' />
   <meta name="keywords" content="<%= @meta_keywords %>" />
-  <meta name="description" content="<%= @meta_description %>" />
-  
-  <% cache("app-head-html") do %>
-    <%= stylesheet_link_tag "front", "data-turbolinks-track" => true %>
-    <% if mobile? %>
-      <%= stylesheet_link_tag "mobile" %>
-      <meta name="apple-mobile-web-app-capable" content="no">
-      <meta content='True' name='HandheldFriendly' />
-      <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" />
-      <link rel="apple-touch-icon-precomposed" href="<%= asset_path("ios-icon.png") %>" />
-    <% end %>
-    <link rel="shortcut icon" href="<%= asset_path("big_logo.png") %>" />
-    <%= auto_discovery_link_tag(:rss,feed_topics_url,:title => '订阅最新帖') %>
-    <%= javascript_include_tag "app", "data-turbolinks-track" => true %>
+  <meta name="description" content="<%= @meta_description %>" />  
+  <%= stylesheet_link_tag "front", "data-turbolinks-track" => true %>
+  <% if mobile? %>
+    <%= stylesheet_link_tag "mobile" %>
+    <meta name="apple-mobile-web-app-capable" content="no">
+    <meta content='True' name='HandheldFriendly' />
+    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" />
+    <link rel="apple-touch-icon-precomposed" href="<%= asset_path("ios-icon.png") %>" />
   <% end %>
-  
+  <link rel="shortcut icon" href="<%= asset_path("big_logo.png") %>" />
+  <%= auto_discovery_link_tag(:rss,feed_topics_url,:title => '订阅最新帖') %>
+  <%= javascript_include_tag "app", "data-turbolinks-track" => true %>
   <%= csrf_meta_tag %>
   <%= yield :node_feed_link %>
   <%= raw SiteConfig.custom_head_html %>