在update或create django中标识更新的字段

我如何检测哪些数据已更新,哪些数据已在数据库中创建 MyModel.objects.update_or_create() 方法

try:
    new_data = MyModel.objects.update_or_create(
        data_1 = active_sheet["{}{}".format("A", row)].value,
        data_2 = active_sheet["{}{}".format("B", row)].value,
    )  
    # default url
    url = reverse('admin:index') + 'some-url/'
    # if some users were only updated, not uploaded
        # pass the updated data to custom template 
        # return the current page with a table of the entries that were not added  
    self.message_user(request, 'Tagged Profile uploaded.')   
    # redirect to selected url
    return HttpResponseRedirect(url)
except Exception as e:
    messages.warning(request, '%s. If you are seing this, there is an error in your file.' % e)