i am sending request to backend like this

const createOrderButton = document.getElementById('createUserCart');

    createOrderButton.addEventListener('click', function () {
        const urlAddress = document.getElementById('cart-wrapper').getAttribute('action');
        console.log(JSON.stringify(cart));
        if (urlAddress === '/orders/') {
            let promise = fetch(urlAddress, {
                method: "POST",
                headers: {
                    'Content-Type': 'application/json',
                    "X-CSRFToken": CSRF_TOKEN
                },
                body: JSON.stringify(cart)
            });
            console.log(promise);
        }
    });

the cart object is like
[{“product_id” : 1, “name” : “item1”, “img_src”:”https://…”, …}, {}, …]

my views.py

class CreateCart(View):
    template_name = "orders/index.html"

    def post(self, request):
        user_cart = json.loads(request.body.decode())

        random_id = uuid.uuid4()
        date_create = now()
        cart_objects_to_create = [
            Cart(
                user=User.objects.get(id=request.user.id),
                product=Product.objects.get(
                    id=int(el['product_id'])
                ),
                cart_id=random_id,
                date_create=date_create
            )
            for el in user_cart
        ]
        Cart.objects.bulk_create(cart_objects_to_create)
        return render(request, self.template_name)

This code is insert objects into sql table, but dont render template and i see error

Internal Server Error: /orders/
Traceback (most recent call last):
File “/Users/danya/CodeProject/djangoMarketPlace/venv/lib/python3.12/site-packages/django/core/handlers/exception.py”, line 55, in inner
response = get_response(request)
^^^^^^^^^^^^^^^^^^^^^
File “/Users/danya/CodeProject/djangoMarketPlace/venv/lib/python3.12/site-packages/django/core/handlers/base.py”, line 197, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/Users/danya/CodeProject/djangoMarketPlace/venv/lib/python3.12/site-packages/django/views/generic/base.py”, line 104, in view
return self.dispatch(request, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/Users/danya/CodeProject/djangoMarketPlace/venv/lib/python3.12/site-packages/django/views/generic/base.py”, line 143, in dispatch
return handler(request, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/Users/danya/CodeProject/djangoMarketPlace/orders/views.py”, line 42, in post
return render(request, self.template_name)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/Users/danya/CodeProject/djangoMarketPlace/venv/lib/python3.12/site-packages/django/shortcuts.py”, line 25, in render
content = loader.render_to_string(template_name, context, request, using=using)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/Users/danya/CodeProject/djangoMarketPlace/venv/lib/python3.12/site-packages/django/template/loader.py”, line 62, in render_to_string
return template.render(context, request)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/Users/danya/CodeProject/djangoMarketPlace/venv/lib/python3.12/site-packages/django/template/backends/jinja2.py”, line 72, in render
context.update(context_processor(request))
ValueError: dictionary update sequence element #0 has length 653; 2 is required

length 653 is len of list, if display it like string

i try to fetch like this

createOrderButton.addEventListener('click', function () {
        const urlAddress = document.getElementById('cart-wrapper').getAttribute('action');
        console.log(JSON.stringify(cart));
        if (urlAddress === '/orders/') {
            let promise = fetch(urlAddress, {
                method: "POST",
                headers: {
                    'Content-Type': 'application/json',
                    "X-CSRFToken": CSRF_TOKEN
                },
                body: JSON.stringify({"cart": JSON.stringify(cart)})
            });
            console.log(promise);
        }
    });

but i also have valueError and i try change inheriting from View to CreateView