getIsGrantedSubject example

        $request = $event->getRequest();
        $arguments = $event->getNamedArguments();

        foreach ($attributes as $attribute) {
            $subject = null;

            if ($subjectRef = $attribute->subject) {
                if (\is_array($subjectRef)) {
                    foreach ($subjectRef as $refKey => $ref) {
                        $subject[\is_string($refKey) ? $refKey : (string) $ref] = $this->getIsGrantedSubject($ref, $request, $arguments);
                    }
                } else {
                    $subject = $this->getIsGrantedSubject($subjectRef, $request, $arguments);
                }
            }

            if (!$this->authChecker->isGranted($attribute->attribute, $subject)) {
                $message = $attribute->message ?: sprintf('Access Denied by #[IsGranted(%s)] on controller', $this->getIsGrantedString($attribute));

                if ($statusCode = $attribute->statusCode) {
                    throw new HttpException($statusCode, $message, code: $attribute->exceptionCode ?? 0);
                }