[FIXED] Patch Method with Extend User Model in Django Rest Framework

Issue

I'm trying to create a Patch method with Extend User Model in Django Rest Framework.

My Extend User Model:

class Profile(models.Model):
    user = models.OneToOneField(User, unique=True)
    bio = models.CharField

My serializers:

class UserEditSerializer(ModelSerializer):
bio = serializers.CharField(source='profile.bio')
class Meta:
    model = User
    fields = [
        'username',
        'email',
        'first_name',
        'last_name',
        'bio'
    ]

My Viewsets:

class UserUpdateAPIView(ReadOnlyModelViewSet):
queryset = User.objects.all()
serializer_class = UserEditSerializer

@detail_route(methods=['PATCH'])
def edit(self, request):
    user_obj = User.objects.get(user__id=request.user.id)
    print(user_obj)
    serializer = UserEditSerializer(user_obj, data=request.data, partial=True)
    print(request.data)
    if serializer.is_valid():
        serializer.save()
        return Response(serializer.data)
    return Response(status=status.HTTP_400_BAD_REQUEST)

Data sent with POSTMAN (json)

{ "email": "[email protected]", "profile": {"bio": "Cant send request" } }

Error:

Profile.Bio cant response true data

Photo:

Solution

UserEditSerializer's model is Profile class. But you are try to pass as object User instance. You need to change serializer class:

class UserEditSerializer(ModelSerializer):
    bio = serializers.CharField(source='profile.bio')
    class Meta:
        model = User
        fields = [
            'username',
            'email',
            'first_name',
            'last_name',
            'bio',
        ]

or view:

@detail_route(methods=['PATCH'])
def edit(self, request):
    user_obj = Profile.objects.get(user__id=request.user.id)
    serializer = UserEditSerializer(user_obj, data=request.data, partial=True)

UPD

To make nested relation writable you need to override serializer's create and update methods, see details in the doc. Example:

class UserEditSerializer(ModelSerializer):
    bio = serializers.CharField(source='profile.bio')
    class Meta:
        model = User
        fields = [
            'username',
            'email',
            'first_name',
            'last_name',
            'bio',
        ]
    def update(self, instance, validated_data):
        profile = validated_data.pop('profile')
        instance = super().update(instance, validated_data)
        instance.profile.bio = profile.get('bio', instance.profile.bio)
        instance.profile.save()            
        return instance

Also you need to post data like this { "email": "[email protected]", "bio": "Cant send request" }.

Answered By - neverwalkaloner