[django]如何在 Django 额外操作中添加可选的过滤器/查询参数

class Parent(
  mixin.CreateModelMixin, 
  mixin.ListModelMixin, 
  mixin.RetrieveModelMixin, 
  viewset.GenericViewSet
):
  queryset = Model.objects.all()
  serializer_class = ParentSerializer
  ...
  ...
  @action(detail=True, methods=["get", "post"], serializer_class=SomeSerializerclass)
  def extra(self, request, *args, **kwargs):
    if request.method == "GET":
      .... do something
    else:  # request.method is POST
      .... do something
    ...