Laravel.io
dd(($category->type_show == 'list') ? 1 : $request->get('quantity'));

//If last order not exist
if( is_null($lastOrder) ) {
    $order['id'] = Order::create([
            'nickname' => $request->get('nickname'),
            'product_id' => $product->id,
            'quantity' => ($category->type_show == 'list') ? 1 : $request->get('quantity'),
            'cost' => $product->price,
        ]
    )->id;
}

Please note that all pasted data is publicly available.