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layout_fragment_caching

⚡️ Layout Fragment Caching with Russian Doll Strategy​

Boost performance by caching expensive layout fragments and nesting caches. When using Russian doll caching, you can expire only the necessary parts without flushing the entire layout.

In app/views/layouts/application.html.erb:

<% cache ['layout', current_user.cache_key_with_version, I18n.locale] do %>
  <header>
    <%= render 'shared/global_nav' %>
  </header>

  <main>
    <%= yield %>
  </main>

  <footer>
    <%= render 'shared/footer' %>
  </footer>
<% end %>

Inside partials, keep caching nested:

<!-- app/views/shared/_global_nav.html.erb -->
<% cache ['nav', current_user.cache_key_with_version] do %>
  <nav><!-- expensive menu build --></nav>
<% end %>