public function add(Users $user, $extra = null)
{
$name = $this->getName();
foreach ($extra as $category) {
$userBadge = new UsersBadges();
$userBadge->users_id = $user->id;
$userBadge->badge = $category->name . ' / ' . $name;
$userBadge->save();
}
return $this;
}