如何根据DRF中的模型对所有数据进行分组？

from rest_framework import serializers
from .models import Book

class BookSerializer(serializers.ModelSerializer):
    class Meta:
        model = Book
        fields = '__all__'

from rest_framework.views import APIView
from rest_framework.response import Response

class BookView(APIView):
    def get(self, request):
        books = Book.objects.all()
        serializer = BookSerializer(books, many=True)
        return Response(serializer.data)

from django.db.models import Count

class BookView(APIView):
    def get(self, request):
        books = Book.objects.values('category').annotate(count=Count('id'))
        return Response(books)