title: rails3 caching: expire_action with parameters cached by caches_action(GET)
body: <p>I'm working on a search feature that when typing something make an ajax call to get the results. I wanna caches the search action with search keywords in memory_cache, so i make it like this: </p>
  
  <pre><code># caches_action with GET parameters
  
  caches_action :search_posts, :cache_path =&gt; Proc.new { |c| c.params }
  </code></pre>
  
  <p>My question is how can i expire the action with parameters too? Is there another way to make my feature works?</p>