class ActiveModel::Serializer::CollectionSerializer

def serializable_hash(adapter_options, options, adapter_instance)
  include_directive = ActiveModel::Serializer.include_directive_from_options(adapter_options)
  adapter_options[:cached_attributes] ||= ActiveModel::Serializer.cache_read_multi(self, adapter_instance, include_directive)
  adapter_opts = adapter_options.merge(include_directive: include_directive)
  serializers.map do |serializer|
    serializer.serializable_hash(adapter_opts, options, adapter_instance)
  end
end