django rest框架类别父级和子级计数

# serializers.py
from rest_framework import serializers
from .models import ParentModel, ChildModel

class ChildModelSerializer(serializers.ModelSerializer):
    class Meta:
        model = ChildModel
        fields = '__all__'

class ParentModelSerializer(serializers.ModelSerializer):
    children = ChildModelSerializer(many=True, read_only=True)
    child_count = serializers.SerializerMethodField()

    def get_child_count(self, obj):
        return obj.children.count()

    class Meta:
        model = ParentModel
        fields = '__all__'

# views.py
from rest_framework import viewsets
from .models import ParentModel, ChildModel
from .serializers import ParentModelSerializer, ChildModelSerializer

class ParentModelViewSet(viewsets.ModelViewSet):
    queryset = ParentModel.objects.all()
    serializer_class = ParentModelSerializer

class ChildModelViewSet(viewsets.ModelViewSet):
    queryset = ChildModel.objects.all()
    serializer_class = ChildModelSerializer