private function hashHashable()
    {
        $hasher = new BcryptHasher;
        $filtered = array_filter($this->attributes);

        foreach ($filtered as $key => $value)
        {
            if (in_array($key, $this->hashable) && $value != $this->getOriginal($key))
            {
                $this->attributes[$key] = $hasher->make($value);
            }
        }
    }