/** * Returns foreign keys and entity references * * @return array * [CRM_Core_Reference_Interface] */ static function getReferenceColumns() { if (!self::$_links) { self::$_links = static::createReferenceColumns(__CLASS__); self::$_links[] = new CRM_Core_Reference_Basic(self::getTableName(), 'domain_id', 'civicrm_domain', 'id'); self::$_links[] = new CRM_Core_Reference_Basic(self::getTableName(), 'parent_id', 'civicrm_navigation', 'id'); } return self::$_links; }