public function viewAuction($id)
{
    $auction = Auction::with(['vehicles', 'bids' => function($q){
        $q->orderBy('amount', 'desc');
    }])->findOrFail($id);

    $currentBid = $auction->bids->first()->amount ?? $auction->starting_bid;

    return view('auction.view', compact('auction', 'currentBid'));
}