/** * {@inheritdoc} */ protected function normalizeAttributes(AttributeGroupInterface $group) { $attributes = parent::normalizeAttributes($group); return implode(',', $attributes); }
/** * {@inheritdoc} */ public function normalize($object, $format = null, array $context = []) { $data = parent::normalize($object, $format, $context); $data['attributes'] = implode(',', $data['attributes']); return $data; }