Question

我正在使用Django跟踪购物车中商品的总成本。我的问题是跟踪的第一个项目。当您扣除数量或减少数量时，价格会调整。但是低于它的任何东西都不会调整总成本。我认为问题是我没有错误地循环，所以经过几个小时的失败，我想我会问。

在

def cart()

我循环遍历成员变量添加更新他们的价值观我遇到的问题是，当您点击book_id

时，只会将cart()传递给remove_from_cart函数

但是，如果只传递了一个book_id的问题，那么无论传递的book_id是什么，只有购物车列表中的第一个项目才会被更改？

views.py

@login_required
def add_to_cart(request,book_id):
    book = get_object_or_404(Book, pk=book_id)
    cart,created = Cart.objects.get_or_create(user=request.user, active=True)
    order,created = BookOrder.objects.get_or_create(book=book,cart=cart)
    order.quantity += 1
    order.save()
    messages.success(request, "Cart updated!")
    return redirect('cart')


def remove_from_cart(request, book_id):
    if request.user.is_authenticated():
        try:
            book = Book.objects.get(pk = book_id)
        except ObjectDoesNotExist:
            pass 
        else:
            cart = Cart.objects.get(user = request.user, active = True)
            cart.remove_from_cart(book_id)
        return redirect('cart')
    else:
        return redirect('index')


def cart(request):
    if request.user.is_authenticated():
        cart = Cart.objects.filter(user=request.user.id, active = True)
        orders = BookOrder.objects.filter(cart=cart)
        total = 0
        count = 0
        for order in orders:
            total += order.book.price * order.quantity
            count += order.quantity
            context = {
            'cart': orders,
            'total': total,
            'count': count,
            }
            return render(request, 'store/cart.html', context)
        else:
            return redirect('index')

Answer 1

你的缩进稍微偏离了

def cart(request):
    if request.user.is_authenticated():
        cart = Cart.objects.filter(user=request.user.id, active = True)
        orders = BookOrder.objects.filter(cart=cart)
        total = 0
        count = 0
        for order in orders:
            total += order.book.price * order.quantity
            count += order.quantity
        #Indentation needs to be offset by one level from here on
        context = {
            'cart': orders,
            'total': total,
            'count': count,
        }
        return render(request, 'store/cart.html', context)
    else:
        return redirect('index')

使用Django更新购物车中的项目

1 个答案: