public function findUserById($id, $group_field = 'id')
{
$user = Sentry::findUserById($id);
$user->company_id = json_decode($user->company_id);
$user->user_groups = $this->getUserGroups($user, $group_field);
$user->is_banned = $this->isBanned($user->id);
return $user;
}