使用Django REST发出POST请求时validated_data为空

我正在尝试使用Django REST框架在数据库中创建新条目，并且能够成功发送请求，但是validated_data为空：

# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.shortcuts import render
from rest_framework import viewsets
from django.shortcuts import get_object_or_404, get_list_or_404
from .models import GetPurchases, CarFax
from .serializers import PurchasesSerializer
from .serializers import CarFaxSerializer
from rest_framework.response import Response

# Create your views here.


class GetCarFax(viewsets.ModelViewSet):
    ''' This view will be used for POSTing new carfax reports to the database '''

    queryset = CarFax.objects.all()
    serializer_class = CarFaxSerializer
    # authentication_classes = []
    permission_classes = []
    #print('TEST')

    def list(self, request):

        # accessed at url: ^api/v1/carfax/$
        queryset = CarFax.objects.all()
        serializer = CarFaxSerializer(queryset, many=True)

        return Response(serializer.data)

    def retrieve(self, request, pk=None, *args, **kwargs):
        # accessed at url: ^api/v1/retrieve/{pk}/$
        queryset = CarFax.objects.all()
        record = get_list_or_404(queryset, vin__exact=pk)
        serializer = CarFaxSerializer(record, many=True)

        return Response(serializer.data)

    def create(self, request, **validated_data):
        print('TEST')
        print(request.data)
        print(validated_data)
        serializer = CarFaxSerializer(CarFax.objects.create(**validated_data))
        headers = self.get_success_headers(serializer.data)
        print(serializer.data)

        print(headers)
        return Response(serializer.data, headers=headers)

serializers.py

class CarFaxSerializer(serializers.ModelSerializer):

    class Meta:
        model = CarFax
        fields = ('vin', 'structural_damage', 'total_loss',
                  'accident', 'airbags', 'odometer', 'recalls',
                  'last_updated')

当我打印时，request.data我可以看到发送的数据。但是validated_data为空，这是我用来创建模型的字典。