如何使用Django-Rest框架对子查询相关的项进行查询？

# models.py
from django.db import models

class ParentModel(models.Model):
    name = models.CharField(max_length=100)

class ChildModel(models.Model):
    parent = models.ForeignKey(ParentModel, on_delete=models.CASCADE)
    name = models.CharField(max_length=100)

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

class ChildSerializer(serializers.ModelSerializer):
    class Meta:
        model = ChildModel
        fields = ('name',)

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

    class Meta:
        model = ParentModel
        fields = ('name', 'children')

# views.py
from rest_framework import viewsets
from .models import ParentModel
from .serializers import ParentSerializer

class ParentViewSet(viewsets.ModelViewSet):
    queryset = ParentModel.objects.all()
    serializer_class = ParentSerializer

# urls.py
from django.urls import include, path
from rest_framework import routers
from .views import ParentViewSet

router = routers.DefaultRouter()
router.register(r'parents', ParentViewSet)

urlpatterns = [
    path('', include(router.urls)),
]