public function mutate($name, $attributes)
    {
        // snake_case to camelCase
        $modelClass = "\\NEM\\Models\\" . Str::studly($name);

        if (!class_exists($modelClass)) {
            throw new BadMethodCallException("Model class '" . $modelClass . "' could not be found in \\NEM\\Model namespace.");
        }

        //XXX add fields list to Models
        $instance = new $modelClass($attributes);
        return $instance;
    }