public function getLeaderboardTypes()
    {
        $leaderboardTypesArray = array();
        $leaderboardTypesService = $this->getServiceManager()->get('playgroundreward_leaderboardtype_service');
        $leaderboardTypes = $leaderboardTypesService->getLeaderboardTypeMapper()->findAll();
    
        foreach ($leaderboardTypes as $leaderboardType) {
            $leaderboardTypesArray[$leaderboardType->getId()] = $leaderboardType->getName();
        }

        return $leaderboardTypesArray;
    }