TypeError: Объект типа 'Product' не является сериализуемым в JSON

Я создаю магазин, который может обрабатывать покупки без какой-либо регистрации, но у меня есть некоторые проблемы.

Я храню данные о товарах, которые пользователь добавил в корзину в сессиях django и пытаюсь создать аналогичную систему, которая будет хранить заказы, которые сделал пользователь.

Это представление, которое выполняется после завершения всех платежей:

#I am not pasting the imports, all fine with them

basket = Basket(request)
orders = Orders(request)

 ### We are looping through the all items we are storing in basket to create for each one, single order
 for basketitem in basket:
                    #This order is automatically created for admin, just ignore it, it's working fine
                    order = Order.objects.create(user_id=user_id, product=basketitem['product'], size=basketitem['size'], quantity=basketitem['quantity'], full_name=full_name, address1=address1,
                                                 address2=address2, postcode=postcode, town=town, country=country, total_paid=baskettotal, order_key=order_key, authenticated=False)

                    #This is the main problem, this is trying to get a product from database "Product" comparing id from database to id that we store in basket in django sessions
                    product = get_object_or_404(
                        Product, id=int(basketitem['productid']))

                    orders.add(product=product, quantity=basketitem['quantity'], size=basketitem['size'], full_name=full_name, address1=address1,
                               address2=address2, postcode=postcode, town=town, country=country, created=now.strftime("%d/%m/%Y %H:%M:%S"))

После этого возникает ошибка "Object of type 'Product' is not JSON serializable"

Basket.py

class Basket():
    def __init__(self, request):
        self.session = request.session
        basket = self.session.get('bt')
        if 'bt' not in request.session:
            basket = self.session['bt'] = {}
        self.basket = basket

    def add(self, product, quantity, size):
        product_id = str(product.id)

        if product_id not in self.basket:
            self.basket[product_id] = {'productid': int(product.id), 'price': int(
                product.price), 'quantity': int(quantity), 'size': int(size)}

        self.session.modified = True

Orders.py

class Orders():
    def __init__(self, request):
        self.session = request.session
        orders = self.session.get('os')
        if 'os' not in request.session:
            orders = self.session['os'] = {}
        self.orders = orders

    def add(self, product, quantity, size, full_name, address1, address2, postcode, town, country, created):
        product_id = str(product.id)

        if product_id not in self.orders:
            self.orders[product_id] = {'price': int(
                product.price), 'quantity': int(quantity), 'size': int(size), 'full_name': str(full_name),
                'address1': str(address1), 'address2': str(address2), 'postcode': str(postcode), 'town': str(town),
                'country': str(country), 'created': str(created)
            }

        self.session.modified = True

Models.py

class Product(models.Model):
    category = models.ForeignKey(
        Category, related_name='product', on_delete=models.CASCADE)
    title = models.CharField(max_length=24)
    description = models.TextField(blank=True)
    color = models.CharField(max_length=20, blank=True)
    image = models.ImageField(upload_to='images/')
    in_stock = models.BooleanField(default=False)
    promotion = models.BooleanField(default=False)
    price = models.FloatField(max_length=6)
    created = models.DateTimeField(auto_now=True)
    slug = models.SlugField(max_length=255)
    objects = models.Manager()
    products = ProductManager()

    class Meta:
        verbose_name_plural = 'Products'
        ordering = ('-created',)

    def get_absolute_url(self):
        return reverse('store:item', args=[self.slug])

    def __str__(self):
        return self.title

Интересно, почему аналогичная операция, которая выполняется, не выдает ту же ошибку

def basket_add(request):
    '''
    Handles data captured from ajax and adds product to basket,
    updates the actual amount of products in basket.
    '''
    basket = Basket(request)
    if request.POST.get('action') == 'post':
        product_id = int(request.POST.get('productid'))
        quantity = int(request.POST.get('quantity'))
        size = int(request.POST.get('size'))
        product = get_object_or_404(Product, id=product_id)
        basket.add(product=product, quantity=quantity, size=size)
        basket_quantity = basket.__len__()
        response = JsonResponse({'quantity': basket_quantity})
        return response

Есть решения?

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