class UserSerializer(serializers.ModelSerializer):

    profile = ProfileSerializer()

    class Meta:

        model = User

        fields = ['username', 'email', 'profile']

    def create(self, validated_data):

        profile_data = validated_data.pop('profile')

        user = User.objects.create(**validated_data)

        Profile.objects.create(user=user, **profile_data)

        return user  
	
	 update(self, instance, validated_data):

        profile_data = validated_data.pop('profile')

        # Unless the application properly enforces that this field is

        # always set, the following could raise a `DoesNotExist`, which

        # would need to be handled.

        profile = instance.profile

        instance.username = validated_data.get('username', instance.username)

        instance.email = validated_data.get('email', instance.email)

        instance.save()

        profile.is_premium_member = profile_data.get(

            'is_premium_member',

            profile.is_premium_member

        )

        profile.has_support_contract = profile_data.get(

            'has_support_contract',

            profile.has_support_contract

         )

        profile.save()

        return instance