/**
  * make sure the cached dates array is reset when patient_unavailables is updated.
  *
  * @param string $name
  * @param mixed  $value
  *
  * @return mixed|void
  */
 public function __set($name, $value)
 {
     if ($name == 'patient_unavailables') {
         $this->_unavailable_dates = null;
     }
     parent::__set($name, $value);
 }