How to place an order for an anonymous user?

Question

Django

Hello! I started making an online store, and I ran into such a problem, I can’t normally place an order for an anonymous user. Creating a shopping cart and adding products to it for anonymous users was implemented through sessions like this

class CartMixin(View):

    def dispatch(self, request, *args, **kwargs):
        if not request.session.session_key:
            request.session.save()
        self.session = request.session

        if request.user.is_authenticated:
            customer = Customer.objects.filter(user=request.user).first()
            if not customer:
                customer = Customer.objects.create(user=request.user)
            cart = Cart.objects.filter(owner=customer, in_order=False).first()
            if not cart:
                cart = Cart.objects.create(owner=customer)
        else:
            cart = Cart.objects.filter(session_key=self.session.session_key, for_anonymous_user=True).first()
            if not cart:
                cart = Cart.objects.create(session_key=self.session.session_key, for_anonymous_user=True)
        self.cart = cart
        return super().dispatch(request, *args, **kwargs)

This is a cart model.

class Cart(models.Model):

    owner = models.ForeignKey('Customer', null=True, verbose_name='Владелец', on_delete=models.CASCADE)
    products = models.ManyToManyField(CartProduct, blank=True, related_name='related_cart')
    total_products = models.PositiveIntegerField(default=0)
    final_price = models.DecimalField(max_digits=9, default=0, decimal_places=2, verbose_name='Общая стоимость')
    created_at = models.DateTimeField(auto_now_add=True, verbose_name='Дата создания заказа')
    in_order = models.BooleanField(default=False)
    for_anonymous_user = models.BooleanField(default=False)
    session_key = models.CharField(max_length=32, null=True)

And here everything seems to be fine, baskets are created, goods are added / removed, everything is as it should be. Problems arise when trying to place an order.

The order form in views.py looks like this:

class MakeOrderView(CartMixin, View):

    @transaction.atomic
    def post(self, request, *args, **kwargs):
        form = OrderForm(request.POST or None)
        if request.user.is_authenticated:
            customer = Customer.objects.get(user=request.user)
        if form.is_valid():
            new_order = form.save(commit=False)
            new_order.customer = customer
            new_order.first_name = form.cleaned_data['first_name']
            new_order.last_name = form.cleaned_data['last_name']
            new_order.phone = form.cleaned_data['phone']
            new_order.address = form.cleaned_data['address']
            new_order.buying_type = form.cleaned_data['buying_type']
            new_order.order_date = form.cleaned_data['order_date']
            new_order.comment = form.cleaned_data['comment']
            new_order.save()
            self.cart.in_order = True
            self.cart.save()
            # msg = str(self.cart.products.values('product'))
            # send_mail('Заказ', msg, '[email protected]ndex.ru', ['[email protected]'])
            new_order.cart = self.cart
            new_order.save()
            customer.orders.add(new_order)
            messages.add_message(request, messages.INFO, 'Спасибо за заказ')
            return HttpResponseRedirect('/')
        return HttpResponseRedirect('/checkout/')

As I understand it, there is a mistake in this line, it needs to be improved somehow

if request.user.is_authenticated:
            customer = Customer.objects.get(user=request.user)

It is clear that he cannot get the user if he is anonymous. I tried to create a guest user and bind everything to him, but then after the order, the anonymous cart is not updated. I also found articles that you can make a temporary registration, but I did not manage to implement it. Please tell me how to fix this? Thanks in advance :)

Answer 1

Make the Order model have the same fields for an anonymous user as Cart, well, and the same work logic.
Threat at least I would immediately create a user, at the moment when the basket would be needed, perhaps earlier (this is usually what marketers really want) and there would be no need to fence additional work logic.