/**
* Activates a User and set the init date to now.
*/
public function activateUser(User $user)
{
$user->setIsEnabled(true);
$user->setIsMailValidated(true);
$user->setResetPasswordHash(null);
$user->setInitDate(new \DateTime());
$this->objectManager->persist($user);
$this->objectManager->flush();
}