Extend repository in TYPO3 9.5 LTS / Extbase - typo3

Question

I'm trying to extend this IndexRepository to add my own method for a special search.
In the controller I inject my own IndexRepository with:
use Webian\Iancalendar\Domain\Repository\IndexRepository;
/**
* Inject index repository.
*
* #param IndexRepository $indexRepository
*/
public function injectIndexRepository(IndexRepository $indexRepository)
{
$this->indexRepository = $indexRepository;
}
What I did is working but I get this warning:
PHP Warning
Core: Error handler (BE): PHP Warning: Declaration of Webian\Iancalendar\Controller\
BackendController::injectIndexRepository(Webian\Iancalendar\Domain\Repository\IndexRepository $indexRepository)
should be compatible with HDNET\Calendarize\Controller\
AbstractController::injectIndexRepository(HDNET\Calendarize\Domain\Repository\IndexRepository $indexRepository)
in /typo3conf/ext/iancalendar/Classes/Controller/BackendController.php line 42
That's because I'm using my own Webian\Iancalendar\Domain\Repository\IndexRepository that extends HDNET\Calendarize\Domain\Repository\IndexRepository. If I use the original one the warning doesn't appear but obviously my own method is not called.
How can I avoid that warning?

Answer 1

You should either not extend HDNET\Calendarize\Controller\AbstractController but the default AbstractController of Extbase, then you will need to implement all required logic yourself.
Or you just use a different name for your injection method:
use HDNET\Calendarize\Controller\AbstractController;
use MyNamespace\MyExtension\Domain\Repository\IndexRepository;
class MyController extends AbstractController
{
...
/**
* The index repository.
*
* #var IndexRepository
*/
protected $myIndexRepository;
/**
* Inject index repository.
*
* #param IndexRepository $myIndexRepository
*/
public function injectMyIndexRepository(IndexRepository $myIndexRepository)
{
$this->myIndexRepository = $myIndexRepository;
}
...
class IndexRepository extends \HDNET\Calendarize\Domain\Repository\IndexRepository
{
...
// My method that extends \HDNET\Calendarize\Domain\Repository\IndexRepository functionalities
public function findByStartDate(DateTime $startDate = null, DateTime $endDate = null)
{
...
The method name does not really matter, only that it starts with inject and has a type hint indicating the dependency to inject.