Who's on first? Is there a better way?

I want to send mentioned users to the reply when clicking on a notification.

The problem... replies are paginated and nested (one level like this forum).

I wrote this on the Reply model. It works...

public function isOnPageNum()
{
                  // root replies to count
    $count = $this->replyable->replies()->whereNull('parent_id')->get('id') 
				  // stop counting when when we reach the parent or this item
                  ->takeUntil( fn($item) => $item->id == ($this->parent_id ?? $this->id)) 
                  ->count();

    return max((int) ceil(++$count / $this->perPage), 1);
}

Now from a Reply I can get its page, $reply->isOnPageNum()

And, create a correct url... ... /path-to-replyable?page=3#reply-557

Thoughts?