Laravel: Validate GET parameters

In one of our Laravel 5.6 applications at work I had to validate the data of an incoming POST request to our API. ​

Validation of POST data is easily done with custom Request classes that provide their validation checks via the rules() method. ​

A different issue are GET parameters that we got via our route definition, because the Request objects only validate POST data. ​

My solution was to manually add the relevant GET parameters to array-of-data-to-validate by overwriting the all() method: ​

    /**
     * Inject GET parameter "type" into validation data
     *
     * @param array $keys Properties to only return
     *
     * @return array
     */
    public function all($keys = null)
    {
        $data = parent::all($keys);
        $data['type'] = $this->route('type');
        return $data;
    }