public function load(ObjectManager $manager)
 {
     $data = $this->container->get('ilioscore.dataloader.learnerGroup')->getAll();
     foreach ($data as $arr) {
         $entity = new LearnerGroup();
         $entity->setId($arr['id']);
         $entity->setTitle($arr['title']);
         if (!empty($arr['location'])) {
             $entity->setLocation($arr['location']);
         }
         if (!empty($arr['parent'])) {
             $entity->setParent($this->getReference('learnerGroups' . $arr['parent']));
         }
         $entity->setCohort($this->getReference('cohorts' . $arr['cohort']));
         foreach ($arr['users'] as $id) {
             $entity->addUser($this->getReference('users' . $id));
         }
         foreach ($arr['instructors'] as $id) {
             $entity->addInstructor($this->getReference('users' . $id));
         }
         foreach ($arr['instructorGroups'] as $id) {
             $entity->addInstructorGroup($this->getReference('instructorGroups' . $id));
         }
         $manager->persist($entity);
         $this->addReference('learnerGroups' . $arr['id'], $entity);
     }
     $manager->flush();
 }