protected function getDefaultFieldNamePrefix()
    {
        $request = $this->controllerContext->getRequest();
        if (!$request->isMainRequest()) {
            if ($this->arguments['useParentRequest'] === true) {
                return $request->getParentRequest()->getArgumentNamespace();
            } else {
                return $request->getArgumentNamespace();
            }
        }
        return '';
    }