Django Rest Framework, updating nested serialized data

Question

I'm new to using the Django Rest Framework and serialized data, I'm trying to update a nested serializer but ran into a wall, I've looked around but most people have problems in the serializers.py side while I can't even get into def update without an error, these are my classes:

Views.py

from django.shortcuts import render
from rest_framework import generics
from api.serializers import ProfileSerializer
from django.contrib.auth.models import User
from api.models import Profile
from django.http import JsonResponse

class ProfileView(generics.ListCreateAPIView):
    def get(self, request):
        profile = Profile.objects.filter(user_id=request.user.id)
        serializer = ProfileSerializer(profile, many=True)
        return JsonResponse(serializer.data, safe=False)
    def post(self, request, *args, **kwargs):
        profile = Profile.objects.filter(user_id=request.user.id)
        data = request.POST
        serializer = ProfileSerializer(profile, data=data, partial=True)
        if serializer.is_valid():
            serializer.save()
        else:
            print(serializer.errors)
        return JsonResponse(serializer.data, safe=False)

Serializers.py

from rest_framework import serializers
from django.contrib.auth.models import User
from api.models import Profile

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ('id','username','first_name','last_name','email','last_login','date_joined','is_active')

class ProfileSerializer(serializers.ModelSerializer):
    user = UserSerializer()
    class Meta:
        model = Profile
        fields = ('id','phone','birth_date','user')

        def update(self, instance, validated_data):
            #Cant get here
            print("hey")
            return instance

Sample structure

[
    {
        "id": 3,
        "phone": "XXXXXX",
        "birth_date": "2017-06-29",
        "user": {
            "id": 1,
            "username": "xxxxx",
            "first_name": "XXXXX",
            "last_name": "XXXX",
            "email": "xxxxxxx@gmail.com",
            "last_login": "2017-06-29T15:16:11.438818Z",
            "date_joined": "2017-06-23T16:48:38Z",
            "is_active": true
        }
    }
]

My current error: (Post Data: phone = 0000000)

AttributeError at /profile/
'QuerySet' object has no attribute '_meta'

Thank you!

user_6473175 · Answer

Found myself in similar situation and I was able to solve as below.Hope it helps.

def update(self, instance, validated_data):
    user_data = validated_data.pop('user')
    user_serializer = UserSerializer()
    super(self.__class__, self).update(instance,validated_data)
    super(UserSerializer,user_serializer).update(instance.user,user_data)
    return instance

user_12937244 · Answer

I faced a similar issue and resolved it using a workaround. First let me explain my scenario. When a SUBMIT button is pressed on a JS page, it will trigger a REST API which will increment the count of an existing DB item by 1. So I parsed the contents of the incoming JSON request into a variable, say A. But since this variable was immutable, so I created a new variable say X, and then added the value in a format which could be sent to the serializable class like so:- X = {'item_name': A["item_name"], 'count_of_votes': last_count + 1} Then serializer_class_Object = serializer_class(existing_object_ref, data=X)

Django Rest Framework, updating nested serialized data

3 Answers