请求帮助，出现ValueError的错误

报错：

Internal Server Error: /cart/submit_order/
Traceback (most recent call last):
  File "D:\Anaconda3\lib\site-packages\django\db\models\fields\__init__.py", line 1774, in get_prep_value
    return int(value)
ValueError: invalid literal for int() with base 10: 'sessionid'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "D:\Anaconda3\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
    response = get_response(request)
  File "D:\Anaconda3\lib\site-packages\django\core\handlers\base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Users\Lenovo\AppData\Local\Programs\shopping\cart\views.py", line 135, in submit_order
    cart_goods = GoodsInfo.objects.get(id=goods_id)
  File "D:\Anaconda3\lib\site-packages\django\db\models\manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "D:\Anaconda3\lib\site-packages\django\db\models\query.py", line 418, in get
    clone = self._chain() if self.query.combinator else self.filter(*args, **kwargs)
  File "D:\Anaconda3\lib\site-packages\django\db\models\query.py", line 942, in filter
    return self._filter_or_exclude(False, *args, **kwargs)
  File "D:\Anaconda3\lib\site-packages\django\db\models\query.py", line 962, in _filter_or_exclude
    clone._filter_or_exclude_inplace(negate, *args, **kwargs)
  File "D:\Anaconda3\lib\site-packages\django\db\models\query.py", line 969, in _filter_or_exclude_inplace
    self._query.add_q(Q(*args, **kwargs))
  File "D:\Anaconda3\lib\site-packages\django\db\models\sql\query.py", line 1358, in add_q
    clause, _ = self._add_q(q_object, self.used_aliases)
  File "D:\Anaconda3\lib\site-packages\django\db\models\sql\query.py", line 1377, in _add_q
    child_clause, needed_inner = self.build_filter(
  File "D:\Anaconda3\lib\site-packages\django\db\models\sql\query.py", line 1319, in build_filter
    condition = self.build_lookup(lookups, col, value)
  File "D:\Anaconda3\lib\site-packages\django\db\models\sql\query.py", line 1165, in build_lookup
    lookup = lookup_class(lhs, rhs)
  File "D:\Anaconda3\lib\site-packages\django\db\models\lookups.py", line 24, in __init__
    self.rhs = self.get_prep_lookup()
  File "D:\Anaconda3\lib\site-packages\django\db\models\lookups.py", line 76, in get_prep_lookup
    return self.lhs.output_field.get_prep_value(self.rhs)
  File "D:\Anaconda3\lib\site-packages\django\db\models\fields\__init__.py", line 1776, in get_prep_value
    raise e.__class__(
ValueError: Field 'id' expected a number but got 'sessionid'.

相关代码

def place_order(request):
    """提交订单页面"""

    # 读取购物车商品列表
    cart_goods_list = []
    # 商品总数
    cart_goods_count = 0
    # 商品总价
    cart_goods_money = 0
    for goods_id, goods_num in request.COOKIES.items():

        # 我们的商品ID都为数字, 非数字的cookie过滤掉
        if not goods_id.isdigit():
            continue

        cart_goods = GoodsInfo.objects.get(id=goods_id)
        cart_goods.goods_num = goods_num
        cart_goods.total_money = int(goods_num) * cart_goods.goods_price
        cart_goods_list.append(cart_goods)
        # 累加购物车商品总数
        cart_goods_count = cart_goods_count + int(goods_num)
        # 累计商品总价
        cart_goods_money += int(goods_num) * cart_goods.goods_price

    return render(request, 'place_order.html', {'cart_goods_list': cart_goods_list,
                                                'cart_goods_count': cart_goods_count,
                                                'cart_goods_money': cart_goods_money})
def submit_order(request):
    """保存订单"""

    # 获得订单信息
    addr = request.POST.get('addr', '')
    recv = request.POST.get('recv', '')
    tele = request.POST.get('tele', '')
    extra = request.POST.get('extra', '')

    # 保存订单信息
    order_info = OrderInfo()
    order_info.order_addr = addr
    order_info.order_tele = tele
    order_info.order_recv = recv
    order_info.order_extra = extra
    # 生成订单编号
    order_info.order_id = str(int(time.time() * 1000)) + str(int(time.time() * 1000000))
    order_info.save()

    # 跳转页面
    response = redirect('/cart/submit_success/?id=%s' % order_info.order_id)

    # 保存订单商品信息
    for goods_id, goods_num in request.COOKIES.items():
        if goods_id == 'csrftoken':
            continue
        # 查询商品信息
        cart_goods = GoodsInfo.objects.get(id=goods_id)
        # 创建订单商品信息
        order_goods = OrderGoods()
        order_goods.goods_info = cart_goods
        order_goods.goods_order = order_info
        order_goods.goods_num = goods_num
        order_goods.save()
        # 删除购物车信息
        response.delete_cookie(goods_id)

    return response

求求大佬帮我看一下，非常感谢

这是因为在request.COOKIES.items()中含有’sessionid'字典键名，而在if goods_id == 'csrftoken':这句排除语句中只排除了key为‘csrftoken’的情况，导致后面cart_goods = GoodsInfo.objects.get(id=goods_id) 调用时出现值错误。修改方法：if goods_id.isalpha():continue:或者：if  goods_id == 'csrftoken' or goods_id=='sessionid':这样进行排除。

cart_goods = GoodsInfo.objects.get(id=goods_id)  这里goods_id取到了sessionid ，要加个判断，名称是否是商品id

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