在ModelSerializer中，带有ID的POST和GET嵌套对象在django中不能同时工作

from rest_framework import serializers

class NestedObjectSerializer(serializers.ModelSerializer):
    class Meta:
        model = NestedObject
        fields = '__all__'

class ParentObjectSerializer(serializers.ModelSerializer):
    nested_object = NestedObjectSerializer()

    class Meta:
        model = ParentObject
        fields = '__all__'

    def create(self, validated_data):
        nested_object_data = validated_data.pop('nested_object')
        nested_object_id = nested_object_data.get('id')
        if nested_object_id:
            nested_object = NestedObject.objects.get(id=nested_object_id)
            nested_object.__dict__.update(**nested_object_data)
            nested_object.save()
        else:
            nested_object = NestedObject.objects.create(**nested_object_data)
        validated_data['nested_object'] = nested_object
        return super().create(validated_data)

    def update(self, instance, validated_data):
        nested_object_data = validated_data.pop('nested_object')
        nested_object_id = nested_object_data.get('id')
        if nested_object_id:
            nested_object = NestedObject.objects.get(id=nested_object_id)
            nested_object.__dict__.update(**nested_object_data)
            nested_object.save()
        else:
            nested_object = NestedObject.objects.create(**nested_object_data)
        instance.nested_object = nested_object
        return super().update(instance, validated_data)