views.py 文件源码

def form_valid(self, form, *args, **kwargs):
        product = get_object_or_404(Product, pk=self.kwargs['product_id'])
        quantity = form.cleaned_data['quantity']

        cart = get_cart(self.request, create=True)
        cart_item, cart_item_created = CartItem.objects.update_or_create(cart=cart, product=product)

        # If Cart item object has not been created  , amend quantity.
        if cart_item_created is False:
            cart_item.quantity += quantity
        else:
            cart_item.quantity = quantity

        cart_item.save()

        return super(AddToCartView, self).form_valid(form)