如何解决此验证必填错误

Question

我正在基于php laravel框架进行项目，中间使用laravel购物车5.7时出现错误消息，错误消息为 validation.required

public function add_to_cart(Request $request)
{
    $qty = $request->qty;
    $product_id =  $request->product_id;
    $product_info = DB::table('tbl_products')
                    ->where('product_id', $product_id)
                    ->first();
    $data['quantity'] = $qty;
    $data['id'] = $product_info->product_id;
    $data['name'] = $product_info->product_name;
    $data['price'] = $product_info->product_price;
    $data['attributes']['image'] = $product_info->product_image;
    Cart::add($data);
    return Redirect::to('/show-card');
}

当我单击此添加到购物车按钮时，它将需要进入购物车页面，但显示错误消息 validation.required 但是当我手动输入网址“ show-cart”时，效果很好