python - DRF AttributeError 类型对象 'QuerySet' 没有属性 'nom'

Question

我正在制作我的第一个 DRF api，我收到一个我不明白的奇怪的 AttributeError 。当我尝试使用 GET 请求访问我的数据时，出现以下错误:

Got AttributeError when attempting to get a value for field nom on serializer ExpediteurSerializer. The serializer field might be named incorrectly and not match any attribute or key on the type instance. Original exception text was: type object 'QuerySet' has no attribute 'nom'.

我想我在我的serializers.py 文件中做了一些意想不到的事情。以下是我的代码的一些片段。

models.py

from django.db import models

# Create your models here.

class Expediteur(models.Model):
    nom = models.CharField(max_length=50)
    prenom = models.CharField(max_length=100)
    adresse = models.CharField(max_length=200)
    tel = models.IntegerField()

views.py

from django.shortcuts import render
from rest_framework import viewsets
from rest_framework.views import APIView
from rest_framework.response import Response
from polls.serializers import ExpediteurSerializer, DestinataireSerializer, LettrePrioSerializer, TypeLettreRecoSerializer, LettreRecoSerializer, TimbrePrioSerializer, TimbreRecoSerializer
from polls.models import Expediteur, Destinataire, LettrePrio, TypeLettreReco, LettreReco, TimbrePrio, TimbreReco
from rest_framework import status, HTTP_HEADER_ENCODING
from django.shortcuts import render, get_object_or_404

import json
import datetime

from django.http import HttpResponseRedirect, HttpResponse, Http404
from django.shortcuts import render, get_object_or_404
from django.core.urlresolvers import reverse
from django.contrib.auth.decorators import user_passes_test
from django.contrib.auth import login
from django.core.exceptions import ObjectDoesNotExist
from django.views.decorators.csrf import csrf_exempt
from django.utils.timezone import get_current_timezone

# Create your views here.

class ExpeViewSet(APIView):
    serializer_class = ExpediteurSerializer

    def get(self, request):
        queryset = Expediteur.objects.all()
        serializer = ExpediteurSerializer(queryset)
        return Response(serializer.data)

    def post(self, request):
        serializer = self.serializer_class(data=request.DATA)
        return Response(status=status.HTTP_201_CREATED)

序列化器.py

from rest_framework import serializers
from polls.models import Expediteur, Destinataire, LettrePrio, TypeLettreReco, LettreReco, TimbrePrio, TimbreReco


class ExpediteurSerializer(serializers.Serializer):
    nom = serializers.CharField(required=True, allow_blank=False, max_length=50)
    prenom = serializers.CharField(required=True, allow_blank=False, max_length=100)
    adresse = serializers.CharField(required=True, allow_blank=False, max_length=200)
    tel = serializers.IntegerField(required=True)

    def create(self, validated_data):
        return Expediteur.objects.create(**validated_data)
    def update(self, instance, validated_data):
        instance.nom = validated_data.get('nom', instance.nom)
        instance.prenom = validated_data.get('prenom', instance.prenom)
        instance.adresse = validated_data.get('adresse', insatnce.adresse)
        instance.tel = validated_data.get('tel', instance.tel)
        instance.save()
        return instance

Answer 1

我认为您在 View 中缺少许多标志，如下所示:

ExpediteurSerializer(queryset, many=True)

一般来说，通过充分利用 DRF，您可以大大简化代码。首先，根据 documentation 将 ExpediteurSerializer 设为 ModelSerializer 。

然后您还可以摆脱创建和更新方法，DRF 会为您处理所有这些事情。我强烈建议您查看 ModelViewSets，它们让您的生活变得非常轻松。