title: Fragment caching
body: <p>I would like to fragment cache part of a page.<br>
  On the view I have </p>
  
  <pre><code>&lt;% cache("saved_area") do %&gt;
  .
   &lt;% end -%&gt;
  </code></pre>
  
  <p>In the controller:</p>
  
  <pre><code>  def index 
  
     read_fragment("saved_area")
  
     end
  </code></pre>
  
  <p>In config/production:</p>
  
  <pre><code>   config.cache_store = :file_store, File.join(RAILS_ROOT, 'tmp', 'cache') 
  </code></pre>
  
  <p>The file was created in the tmp/cache directory.  But I am not sure if the cache is being used in the request, since I presume there should be a line in the log stating that the cache is being used (and there is not).</p>