In the documentation for fragment caching (Caching with Rails: An Overview — Ruby on Rails Guides), this is stated:
If you don’t want the cache block to bind to the action that called it, You can also use globally keyed fragments by calling the cache method with a key, like so:
<% cache('all_available_products') do %> All available products: <% end %>
This fragment is then available to all actions in the ProductsController [...]
Is it possible to add a globally keyed cache fragment that is available in _all_ controllers, not just ProductsController as in the example above? I plan on having a list of the top 10 items of one of my models, in my layout, so it'd be ideal to have that cached globally.