/**
  * does the element store its data in a join table (1:n)
  * @return bool
  */
 public function isJoin()
 {
     $params =& $this->getParams();
     if ($params->get('ajax_upload') && (int) $params->get('ajax_max', 4) > 1) {
         return true;
     } else {
         return parent::isJoin();
     }
 }
 /**
  * does the element store its data in a join table (1:n)
  * @return bool
  */
 public function isJoin()
 {
     $params =& $this->getParams();
     if ($params->get('database_join_display_type') == 'checkbox') {
         return true;
     } else {
         return parent::isJoin();
     }
 }