cache_collection_render

# File actionview/lib/action_view/renderer/partial_renderer/collection_caching.rb, line 12
      def cache_collection_render(instrumentation_payload)
        return yield unless @options[:cached]

        keyed_collection = collection_by_cache_keys
        cached_partials  = collection_cache.read_multi(*keyed_collection.keys)
        instrumentation_payload[:cache_hits] = cached_partials.size

        @collection = keyed_collection.reject { |key, _| cached_partials.key?(key) }.values
        rendered_partials = @collection.empty? ? [] : yield

        index = 0
        fetch_or_cache_partial(cached_partials, order_by: keyed_collection.each_key) do
          rendered_partials[index].tap { index += 1 }
        end
      end