/**
  * @return Gpf_Db_Table_NewsletterSignups
  */
 public static function getInstance()
 {
     if (self::$instance === null) {
         self::$instance = new self();
     }
     return self::$instance;
 }
 public function init()
 {
     $this->setTable(Gpf_Db_Table_NewsletterSignups::getInstance());
     parent::init();
 }