How to get authenticated user on serializer class for validation

Question

I'm working on a project using django-rest-framework. In my API view, an authenticated user can create other users. But, only five. Then if there are five users registered by one user, I want to send him in the response that hit the limit. Then, I need to get on my serializer the authenticated user but, I can't find a way to pass it from my ModelViewSet to my serializer.

This is my code:

View:

class ChildUserViewSet(viewsets.ModelViewSet):
    serializer_class = ChildUserSerializer
    queryset = User.objects.all()

    authentication_classes = (
        TokenAuthentication,
    )
    permission_classes = (
        IsAuthenticated,
    )

    def perform_create(self, serializer):
        account_group = self.request.user.userprofile.get_account_group

        mobile_number = serializer.data.get('mobile_number')
        password = serializer.data.get('password')
        user = serializer.save()
        user.set_password(password)
        user.save()

        # Generate user profile
        UserProfile.objects.create(
            user=user,
            mobile_number=mobile_number,
            user_type=CHILD,
            related_account_group=account_group,
        )

Serializer:

class ChildUserSerializer(serializers.ModelSerializer):
    mobile_number = serializers.CharField()

    class Meta:
        model = User

        fields = (
            'first_name',
            'last_name',
            'email',
            'password',
            'mobile_number',
        )

    def validate(self, data):
        """
        Check that the start is before the stop.
        """
        # Get authenticated user for raise hit limit validation



    def validate_email(self, value):
        if User.objects.filter(email=value):
            raise serializers.ValidationError("This field must be unique.")
        return value

    def create(self, validated_data):
        username = generate_unique_username(
            u'{0}{1}'.format(
                validated_data['first_name'],
                validated_data['last_name'],
            )
        )

        user = User(
            username=username,
            first_name=validated_data['first_name'],
            last_name=validated_data['last_name'],
            email=validated_data['email'],
        )

        user.set_password(validated_data['password'])
        user.save()

        return user

Then, in the def validate(self, data) function of my serializer, I want to get the currently authenticated user.

How can I pass the request.user from my APIView to my serializer?

Answer 1

In your views when you initialize serializer like

serializer = ChildUserSerializer(data=request.DATA,context={'request':request})

,send a context which contains request.Then in Serializers inside function call

request=self.context['request']

Then you can access request.user.

Answer 2

You can pass additional context to your serializer with serializer = ChildUserSerializer(data, context={'request': request}). You can then access the authenticated user via request.user within your serializer validation method.