/**
  * Set values after reading from DB, e.g. convert from JSON to Array
  *
  * @param $key
  * @param $value
  * @return mixed|null
  */
 public function wakeUp($key, $value)
 {
     switch ($key) {
         case 'labels':
             return json_decode($value, true);
     }
     return parent::wakeUp($key, $value);
 }