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