public function getAttributeValue($name, $convertDates = true)
    {
        if (isset($this->model_data[$name])) {
            $result = $this->model_data[$name];
            if ($result instanceof \DateTime && $convertDates == true) {
                $result = $result->format('Y-m-d H:i:s');
            }
            return $result;
        }
        if (isset($this->data->{$name})) {
            return $this->data->{$name};
        }
        return null;
    }