I have a lot of cached fragments on my website because I use fragment caching with `action_suffix` to use caching in my application template. Im using this for the navigatin for example,... like this:

```
<% cache(:action => params[:action], :action_suffix => "navigation_#{request.path}") %>
  <%= render 'navigation_entries/navigation' %>
<% end %>

```

Its working pretty well but now I have a slight problem expiring the cached Fragments. What I need is a list of all keys for the cached fragments. I had more than just a look at the documentation but I didnt find anything.

Is there a way to list all fragment keys?