[TYPO3-mvc] Using repositories in validators

[Matthew Colton]

Hi,
I'm working on a system that includes ticketing.

One problem I ran into is that the system has to check/validate if
enough tickets are left to be able to complete the reservation process.

So that's why I'm trying to use repositories in a validator. Injecting
repositories doesn't seem to work in validators. If I

  /**
   * Reservation repository
   *
   * @var \NS\Extname\Domain\Repository\ReservationRepository
   * @inject
   */
  protected $reservationRepository;

and then try to use

$this->reservationRepository->amountOfReserverationsOfEventDate();

it results in the following PHP error:

Fatal error: Call to a member function
amountOfReserverationsOfEventDate() on a non-object in
/var/www/laks/hessen-szene.de/cms/typo3conf/ext/laks/Classes/Validation/Validator/EnoughTicketsAvailableValidator.php
on line 69

If I try to make an instance manually via

$this->reservationRepository =
\TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('NS\\Extname\\Domain\\Repository\\ReservationRepository');

it results in the following exception:

Argument 1 passed to
TYPO3\CMS\Extbase\Persistence\Repository::__construct() must implement
interface TYPO3\CMS\Extbase\Object\ObjectManagerInterface, none given,
called in
/var/www/typo3/typo3_src-6.2.9/typo3/sysext/core/Classes/Utility/GeneralUtility.php
on line 4431 and defined in
/var/www/typo3/typo3_src-6.2.9/typo3/sysext/extbase/Classes/Persistence/Repository.php
line 75

So what would be the correct approach?

Thanks in advance!
-- 
Cheers
Matthew