Python 如何组合两个queryset并对其进行排序

我为两个不同的模型设置了两个查询。我把它们和链子结合起来，按日期订购。当我想颠倒顺序时，我得到了一个错误。这是我的密码：

def get_queryset(self):
    query = self.request.GET.get('search')

    if query:
        likes = FilmLike.objects.filter(film__title__icontains=query).exclude(users=None)
        dislikes = FilmDisLike.objects.filter(film__title__icontains=query).exclude(users=None)
        object_list = sorted(chain(likes, dislikes),key=lambda instance: instance.created_at)
    else:
        likes = FilmLike.objects.filter().exclude(users=None)
        dislikes = FilmDisLike.objects.filter().exclude(users=None)
        object_list = list(likes) + list(dislikes)
        object_list = sorted(chain(likes, dislikes),key=lambda instance: instance.created_at)
    return object_list

此代码正在工作，但当我将“instance.created_at”更改为“-instance.created_at”时，我得到以下错误：

bad operand type for unary -: 'dateTime.datetime'

sorted（）。改用
reverse=True
。