Question

I’m using fragment cache but i have inline code that is user specific like:

<% cache @page do %>
  stuff here
<% if current_user %>
  user specific
<% end %>
  more here
<% end %>

So i want to exclude the several blocks of code that are user specific. Is there a way to do that in Rails or should i make an if statement in the beginning and make different caches for logged users and regular visitors? (i will have major duplication of code this way).

Answer 1

For per-user fragments, you can put models in array an array:

<% cache [@page, current_user] do %>

Rails will make a cache-key out of them, like:

pages/page_id-page_timestamp/users/user_id-user_timestamp

This way your fragments will be invalidated on a user/page update since the time-stamps are coming from their updated_at (see cache_key for details).