django中两个变量的和

我试图得到‘a’和‘b’的总和，并在每篇文章中显示出来。但是我得到了一个错误-'Count'对象没有属性'split'。有人能帮忙吗。谢谢

def get_queryset(self):
    a = Count('blogger__posts__title')
    b = Count('blogger__posts__likes')

   return (Blog.objects.filter(date__lte=timezone.now())
                                    .order_by('-date')
                                    .annotate(score=Sum(F(a)+F(b),output_field=FloatField()))
            )

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你可以这样写

def get_queryset(self):
    a = Count('blogger__posts__title')
    b = Count('blogger__posts__likes')
    return (Blog.objects.filter(date__lte=timezone.now())
        .order_by('-date')
        .annotate(s1=a, s2=b)
        .annotate(score=Sum(F('s1')+F('s2'),output_field=FloatField()))
        )