nested-fragment-caching

📦 Tip: Combine Fragment Caching with cache_version for Nested Expiration

Use cache_version on parent records to expire all nested fragments when a root object changes. This gives you fine-grained control over when inner caches should be invalidated.

Example:

# app/models/article.rb
class Article < ApplicationRecord
  has_many :comments

  def cache_version
    [updated_at, comments.maximum(:updated_at)]
  end
end

<% cache @article, version: @article.cache_version do %>
  <%= render 'header', article: @article %>
  <%= render @article.comments %>
<% end %>