Hi All,
I have created Nested serialization for one to many, it work fine on my
windows machine while it dosnt work on my 2nd ubuntu machine.
django 2.2
djangorestframework 3.11.1
*Error*
Got AttributeError when attempting to get a value for field `choice_set2`
on serializer `QuestionSerializer`. The serializer field might be named
incorrectly and not match any attribute or key on the `Question` instance.
Original exception text was: 'Question' object has no attribute
'choice_set2'.
Your help would be highly appreciated.! Thanks in advance
*Below is code. *
*admin.py*
from django.contrib import admin
# Register your models here.
from .models import Question, Choice
admin.site.register(Question)
admin.site.register(Choice)
*models.py*
import datetime
from django.db import models
from django.utils import timezone
class Question(models.Model):
question_text = models.CharField(max_length=200)
pub_date = models.DateTimeField('date published', null=True)
author = models.CharField(max_length=200, null=True)
def __str__(self):
return self.question_text
#def was_published_recently(self):
#now = timezone.now()
#return now - datetime.timedelta(days=1) <= self.pub_date <= now
class Choice(models.Model):
question = models.ForeignKey(Question, on_delete=models.CASCADE)
choice_text = models.CharField(max_length=200)
votes = models.IntegerField(default=0)
def __str__(self):
return self.choice_text
*serialize.py*
from rest_framework import serializers
from . models import Choice, Question
class ChoiceSerializer(serializers.ModelSerializer):
class Meta:
model = Choice
fields = ('choice_text','votes')
class QuestionSerializer(serializers.ModelSerializer):
choice_set2 = ChoiceSerializer(many=True)
class Meta:
model = Question
fields = ('pub_date', 'question_text', 'choice_set2')
# depth = 1
def create(self, validated_data):
choice_validated_data = validated_data.pop('choice_set2')
question = Question.objects.create(**validated_data)
print("Print question****")
print(question)
choice_set2_serializer = self.fields['choice_set2']
for each in choice_validated_data:
each['question'] = question
print("printing child data***********")
print(each)
choices2 = choice_set2_serializer.create(choice_validated_data)
return question
*views.py*
from django.shortcuts import render
# Create your views here.
#from django.http import HttpRespose
from django.shortcuts import get_object_or_404
from rest_framework import generics
from rest_framework.views import APIView
from rest_framework.response import Response
from django.http import HttpResponse, JsonResponse
from rest_framework import status
from rest_framework.decorators import api_view
from django.views.decorators.csrf import csrf_exempt
from . models import Question, Choice
from . serializers import QuestionSerializer, ChoiceSerializer
from rest_framework import viewsets
class ClientAPIView3(viewsets.ViewSet):
def list(self, request):
client = Question.objects.all()
print(client)
serializer = QuestionSerializer(client, many=True)
print(serializer)
return Response(serializer.data)
def create(self, request):
#print(request.data)
serializer = QuestionSerializer(data=request.data)
if serializer.is_valid():
print("in vew create() is_valid**************")
serializer.save()
return Response(serializer.data, status=status.HTTP_201_CREATED)
print("...may be not()?? "+str(serializer.errors))
return Response(serializer.errors,
status=status.HTTP_400_BAD_REQUEST)
def retrive(self, request, pk):
queryset = Client.objects.all()
client = get_object_or_404(queryset, pk=pk)
serializer = ClientSerializer(client)
return Response(serializer.data)
*urls.py*
from django.urls import path, include
#from rest_framework.urlpatterns import format_suffix_patters
from .views import ClientAPIView3
from rest_framework.routers import DefaultRouter
router = DefaultRouter()
#outer.register('ClientAPIView2',ClientAPIView2)
router.register('ClientAPIView3',ClientAPIView3, basename='ClientAPIView3')
#outer.register('DeliveryAddressAPIView2',DeliveryAddressAPIView2)
urlpatterns = [
path('', include(router.urls)),
]
*test data*
{
"question_text":"BPM is?",
"pub_date":"2020-09-08T10:10",
"author":"Sachin Agarwal",
"choice_set":[{
"choice_text": "Business Process Monitoring", "votes":10
},
{
"choice_text": "Business Performance Measurement","votes":20
}
]
}
Using SQLite db for this work.
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