Rails Fragment Caching and Low Level Caching

sample_object.rb

class SampleObject < ApplicationRecord
   def external_components 
     Rails.cache.fetch("#{cache_key_with_version}/components", expires_in: 12.hours) do
     # Some long running task that fetches "components"
    end
  end
end

sample_view.html.erb

<% @sample_object.external_components.each do |component| %>
  <% cache component do %>
    <%= render component %>
  <% end %>
<% end %>

Caching with Rails