public function set($key, $value = null)
    {
        if (!$this->checkExtraColumns()) {
            return;
        }

        $this->load();
        $this->unsaved = true;

        if (is_array($key)) {
            foreach ($key as $k => $v) {
                Arr::set($this->data, $k, $v);
            }
        } else {
            Arr::set($this->data, $key, $value);
        }
    }