how to saven models dynamically inputted by user in form

this is my code-
def final(request, name):
    if request.method == 'POST':
        form = ConfirmForm(request.POST)
        if form.is_valid():
            cd = form.cleaned_data
            quote_item = request.POST['quote_item']
            quote_qty = request.POST['quote_qty']
            #obj = PurchasedItem.objects.create(item__name=quote_item, qty=quote_qty,price=quote_price)
            obj = PurchasedItem(item__name=quote_item__name, qty=quote_qty)
            obj.save()
            purchase_order = PurchaseOrder.objects.get(pk=name)
            item = PurchasedItem.objects.filter(purchase_order_id=name).values_list('item__name', 'qty', 'price')
            total_cost = PurchasedItem.objects.filter(purchase_order_id=name).aggregate(Sum('price')).get('price__sum', 0.00)
            return render(request, 'bills/bills.html', {'purchase_order' : purchase_order,
                 'item' : item, 'total_cost' : total_cost, 'form':form })
     
    else:
        form = ConfirmForm()
    return render(request,'bills/bills.html')



in this code obj.save() method is not working . Kindly help.

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