Python 如何在Django中替换一个模型对象的一个字段？

我正在尝试更改对象的标记。我首先筛选要查找的对象，现在不知道如何替换字段（usertags）

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要使用

ModelForm

更改对象的值，您需要为此

ModelForm

def change_tags(request, pk):
    file = get_object_or_404(Uploaded, pk=pk)
    if request.method == "POST":
        form = ChangeTagsForm(request.POST, instance=file)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(reverse('index'))
    else:
        form = ChangeTagsForm(instance=file)
    return render(request, 'index.html', {'form': form})

def change_tags(request, pk):
    file = get_object_or_404(Uploaded, pk=pk)
    if request.method == "POST":
        form = ChangeTagsForm(request.POST, instance=file)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(reverse('index'))
    else:
        form = ChangeTagsForm(instance=file)
    return render(request, 'index.html', {'form': form})