duxet\Rethinkdb\Eloquent\Model::hasOne PHP Метод

    public function hasOne($related, $foreignKey = null, $localKey = null)
    {
        $foreignKey = $foreignKey ?: $this->getForeignKey();
        $instance = new $related();
        $localKey = $localKey ?: $this->getKeyName();
        return new HasOne($instance->newQuery(), $this, $foreignKey, $localKey);
    }