“ __module__”丢失

Question

我有一个inLineForm，现在我要向ProductDetails添加一个新表单。添加表单后，ge错误“​​ 模块”丢失了。我不确定是什么问题。

我要这样做的是：我正在创建一个名为product的对象，该对象通过inLineForm将信息放入这些表中：Product，Product Details和Product size

这是方法：

def restaurant_add_product(request):

    fields = ['size', 'price']
    ProductSizeFormSet = inlineformset_factory(Product, ProductDetails, ProductSize, fields=fields)
    form = ProductForm(request.POST or None, request.FILES or None)
    product_details_forms = ProductDetailForm(request.POST or None, instance = Product.objects.get(id = product_id))
    formset = ProductSizeFormSet(request.POST or None)

products to each restaurant
    if request.method == "POST":

        if form.is_valid():
            product = form.save(commit=False)
            product.restaurant = request.user.restaurant
            product.save()

        if product_details_forms.is_valid():
            productDetails = product_details_forms.save(commit=False)
            productDetails.save()

            if formset.is_valid():
                formset.save()
            else:
                print(formset.errors)

            return redirect(restaurant_product)

    return render(request, 'restaurant/add-product.html', {
        "form": form,
        "product_details_forms": product_details_forms,
        'formset': formset
    })