Question

我正在尝试使用Django REST框架在数据库中创建一个新条目，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')

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

Answer 1

首先，您的 GetCarFax 类看起来很凌乱:(因为您将覆盖大多数方法，但不会提供任何方法视图的优势。因此，将您的 GetCarFax 视图类更改为以下类别，

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 = []
    lookup_field = 'myfieldname'

这几行代码将为您处理所有 CRUD 操作：）

Answer 2

接受的答案是一个很好的重构，但它没有回答问题，因此可能对未来的读者（比如我自己，刚刚经历过这个问题）没有帮助。验证数据为空的真正原因是，当您在 .create 上覆盖 ModelViewSet 时，您会清除序列化器模型字段绑定，并且必须像在常规序列化器上一样显式指定它们。

CarFax 序列化程序应该像这样定义：

class CarFaxSerializer(serializers.ModelSerializer):

    vin = serializers.CharField(23),
    structural_damage = serializers.BooleanField(),
    total_loss = serializers.BooleanField(),
    accident = serializers.BooleanField(),
    airbags = serializers.BooleanField(),
    odometer = serializers.IntegerField(),
    recalls = serialziers.BooleanField(),
    last_updated = serializers.DateField(),

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

使用Django REST进行POST请求时validated_data为空

2 个答案: