我试图使一个电子商务网站。有1个问题，一直很难解决。问题：订购后，产品应该从购物车中删除。但它不起作用。没有语法错误，但订购后仍有产品剩余。
下面是我的www.example.com的一部分views.py：

if not request.user.is_authenticated:
    session = request.session
    cart = session.get(settings.CART_SESSION_ID)
    if cart is not None:
        del session[settings.CART_SESSION_ID]
else:
    customer = request.user.customer
    order, created = Order.objects.get_or_create(
        customer=customer, complete=False)

    order_products = OrderProduct.objects.filter(order=order)
    if order_products:
        order_product = order_products[0]
    else:
        order_product = OrderProduct.objects.create(order=order)

    order.save()
    messages.success(request, 'Заказ успешно оформлен. Проверьте свою электронную почту!!!')
    session = request.session
    cart = session.get(settings.CART_SESSION_ID)
    if cart is not None:
        del session[settings.CART_SESSION_ID]
        session.modified = True

return redirect('product_list')

我真的希望有人能帮我，拜托。