MessageCollection::fillUnread

public function fillUnread(): self
{
	if ($this->isUnreadFilled)
	{
		return $this;
	}

	$readStatuses = (new ReadService())->getReadStatusesByMessageIds($this->getIds());

	foreach ($this as $message)
	{
		$message->setUnread(!($readStatuses[$message->getMessageId()]));
	}

	$this->isUnreadFilled = true;

	return $this;
}