有没有办法为django rest框架中的嵌套关系(嵌套序列化程序类)动态指定查询集

from rest_framework import serializers
from .models import Parent, Child

class ChildSerializer(serializers.ModelSerializer):
    class Meta:
        model = Child
        fields = '__all__'

class ParentSerializer(serializers.ModelSerializer):
    children = ChildSerializer(many=True, read_only=True)

    class Meta:
        model = Parent
        fields = '__all__'

from rest_framework import viewsets
from .models import Parent
from .serializers import ParentSerializer

class ParentViewSet(viewsets.ModelViewSet):
    queryset = Parent.objects.all()

    def get_serializer_class(self):
        if self.action == 'list':
            return ParentSerializer
        else:
            # 动态指定查询集
            queryset = self.get_queryset().prefetch_related('children')
            return ParentSerializer(queryset=queryset, context=self.get_serializer_context())