DataFixtures/ORM/GroupData.php
public function load(ObjectManager $manager)
    {
        // Normal user
        $group = new Group();
        $group->setName('User');
        $group->setRole('ROLE_USER');
        $manager->persist($group);
        $this->addReference('user-group', $group);

        // Administrator
        $group = new Group();
        $group->setName('Administrator');
        $group->setRole('ROLE_ADMIN');
        $manager->persist($group);
        $this->addReference('admin-group', $group);

        $manager->flush();
    }
public function load(ObjectManager $manager)
    {
        // Normal user
        $group = new Group();
        $group->setName('User');
        $group->setRole('ROLE_USER');
        $manager->persist($group);
        $this->addReference('user-group', $group);

        // Administrator
        $group = new Group();
        $group->setName('Administrator');
        $group->setRole('ROLE_ADMIN');
        $manager->persist($group);
        $this->addReference('admin-group', $group);

        $manager->flush();
    }
Load data fixtures with the passed EntityManager

@param \Doctrine\Common\Persistence\ObjectManager $manager