module ActionView::CollectionCaching

def collection_by_cache_keys(view, template, collection)
  seed = callable_cache_key? ? @options[:cached] : ->(i) { i }
  digest_path = view.digest_path_from_template(template)
  collection.each_with_object([{}, []]) do |item, (hash, ordered_keys)|
    key = expanded_cache_key(seed.call(item), view, template, digest_path)
    ordered_keys << key
    hash[key] = item
  end
end