code: public function getSelectOptions()
      {
          $filter = new UnderscoreToCamelCase();
          $funcName = "get" . ucfirst($filter->filter($this->getUserColumn()));
  
          $resultSet =  $this->fetchAll(array('user_id', $this->getUserColumn()), function (Select $select) {
              $select->where->notEqualTo('user_id', $this->getCurrentUser()->getId());
          });
  
          $options = array();
          foreach ($resultSet as $user) {
              $options[$user->getId()] = $user->$funcName();
          }
  
          return $options;
      }
docs: gets users list for Select form element
  
  @return array