private function returnOutput()
    {
        $collection = new Collection($this->results);

        switch ($this->output) {
            case 'db':
                return $this->saveToDatabase($collection);
                break;
            case 'collection':
                return $collection;
                break;
            case 'json':
                return $collection->toJson();
                break;
            case 'array':
            default:
                return $collection->toArray();
        }
    }