class UserRegistration(object):
    def __init__(self, full_name, stage_name, password="", email="", locale="en_US"):
        self.full_name = full_name
        self.password = password
        self.locale = locale
        self.email = email
        self.stage_name = stage_name

class UserRegistrationSerializer(serializers.Serializer):
    full_name = serializers.CharField(max_length=128, required=False)
    stage_name = serializers.CharField(max_length=128)
    password = serializers.CharField(max_length=128, required=False)
    locale = serializers.CharField(max_length=10, required=False)
    # use CharField instead of EmailField for email. We do our own validation later to make for a better error msg.
    email = serializers.CharField(max_length=254, required=False)

    def restore_object(self, attrs, instance=None):
        if instance is not None:
            instance.full_name = attrs.get('full_name', instance.full_name)
            instance.password = attrs.get('password', instance.password)
            instance.locale = attrs.get('locale', instance.locale)
            instance.email = attrs.get('email', instance.email)
            instance.stage_name = attrs.get('stage_name', instance.stage_name)
            return instance
        return UserRegistration(**attrs)

class UserRegistration(APIView):
    throttle_classes = ()
    serializer_class = UserRegistrationSerializer

    def post(self, request, format=None):
        event_type = "user_registration"
        serializer = UserRegistrationSerializer(data=request.DATA, context={'request': request})
        try:
            if serializer.is_valid():
            user_registration = serializer.object
            # save user_registration pieces in various places...