public function mergeRawAttributes(array $attributes, $sync = false, $force = false)
    {
        foreach ($attributes as $key => $value) {
            if ($force || ((! $force) && (! $this->hasAttribute($key)))) {
                $this->setAttribute($key, $value);
            }
        }

        if ($sync) {
            $this->syncOriginal();
        }

        return $this;
    }