使用django通用表单编辑多对多关系的另一侧

我有两种型号：

 class Actor(models.Model):
     name = models.CharField(max_length=30, unique = True)
     event = models.ManyToManyField(Event, blank=True, null=True)

 class Event(models.Model):
     name = models.CharField(max_length=30, unique = True)
     long_description = models.TextField(blank=True, null=True)

在前面的问题中，我创建了一个带有保存函数的EventForm：

class EventForm(forms.ModelForm):
      class Meta:
            model = Event

      def save(self, commit=True):
            instance = forms.ModelForm.save(self)
            instance.actors_set.clear()
            for actor in self.cleaned_data['actors']:
                instance.actors_set.add(actors)
            return instance

def generic_edit(request, modelname, object_id):
       modelname = modelname.lower()
       form_class = form_dict[modelname]
       return update_object(request,
            form_class = form_class,
            object_id = object_id,
            template_name = 'createdit.html'
       )

这允许我从定义的m2m连接的另一端添加m2m链路

现在我想编辑条目。我一直在使用一个通用函数：

class EventForm(forms.ModelForm):
      class Meta:
            model = Event

      def save(self, commit=True):
            instance = forms.ModelForm.save(self)
            instance.actors_set.clear()
            for actor in self.cleaned_data['actors']:
                instance.actors_set.add(actors)
            return instance

def generic_edit(request, modelname, object_id):
       modelname = modelname.lower()
       form_class = form_dict[modelname]
       return update_object(request,
            form_class = form_class,
            object_id = object_id,
            template_name = 'createdit.html'
       )

但这会提取除保存到此对象的多对多选择之外的所有信息

我想我需要做类似的事情：，但我还没弄明白

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如何使用通用更新对象编辑多对多链接的另一面？

我在这里找到了答案：