我试图在django中创建一个可写的嵌套序列化程序，但无法正确使用post方法

from rest_framework import serializers, viewsets

class NestedSerializer(serializers.ModelSerializer):
    nested_field = serializers.PrimaryKeyRelatedField(queryset=RelatedModel.objects.all())

    class Meta:
        model = YourModel
        fields = ('field1', 'field2', 'nested_field')

class YourViewSet(viewsets.ModelViewSet):
    queryset = YourModel.objects.all()

    def get_serializer_class(self):
        if self.request.method == 'POST':
            return NestedSerializer
        return serializers.ModelSerializer

def create(self, request, *args, **kwargs):
    serializer = self.get_serializer(data=request.data)
    serializer.is_valid(raise_exception=True)
    self.perform_create(serializer)
    headers = self.get_success_headers(serializer.data)
    return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)