private function addThumbnails($entities, $locale)
{
$ids = array_filter(array_column($entities, 'thumbnails'));
$thumbnails = $this->getMediaManager()->getFormatUrls($ids, $locale);
foreach ($entities as $key => $entity) {
if (array_key_exists('thumbnails', $entity) && $entity['thumbnails'] && array_key_exists($entity['thumbnails'], $thumbnails)) {
$entities[$key]['thumbnails'] = $thumbnails[$entity['thumbnails']];
}
}
return $entities;
}