/**
  * @author WN
  * @param string $externalId
  * @param Collection $installations
  * @return bool
  */
 private function isNewInstallation($externalId, Collection $installations)
 {
     $item = $installations->search(function ($item) use($externalId, $installations) {
         if ($item->ext_id == $externalId) {
             return true;
         }
         return false;
     });
     if ($item !== false) {
         $installations->forget($item);
         return false;
     }
     return true;
 }