Message::isUnread

public function isUnread(): bool
{
	if (isset($this->isUnread))
	{
		return $this->isUnread;
	}

	$messageIds = [$this->getMessageId()];
	$this->isUnread = !(new ReadService())->getReadStatusesByMessageIds($messageIds)[$this->getMessageId()];

	return $this->isUnread;
}