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russian_doll_caching

🗂️ Cache Controller Actions with Russian Doll Caching​

Combine low-level controller caching with view-level fragment caching to improve performance. Use cache in views and fresh_when or stale? in controllers.

class ArticlesController < ApplicationController
  def show
    @article = Article.find(params[:id])
    fresh_when(@article) # Sets ETag and Last-Modified headers
  end
end

In the view:

<% cache @article do %>
  <h1><%= @article.title %></h1>
  <% cache [@article, @article.comments] do %>
    <%= render @article.comments %>
  <% end %>
<% end %>