title: How do I expire a django template cache key on receiving a signal?
body: <p>In my front page template I use the cache function like this:</p>
  
  <pre><code>{% cache 86400 my_posts %}
      {% get_latest_posts %}
  {% endcache %}
  </code></pre>
  
  <p>When there is a new post I would like to expire the cache key; like this:</p>
  
  <pre><code>def clear_post_cache():
      cache.delete('my_posts')
  
  post_save.connect(clear_post_cache, sender=Post)
  </code></pre>
  
  <p>My problem is that the cache key isn't accessible as 'my_posts'. How do I find the key name?</p>