public function can_be($method, \System\User $user)
 {
     $member = \Impro\Team\Member::get_first()->where(array('id_system_user' => $user->id, 'id_impro_team' => $this->team->id))->fetch();
     if ($method == \System\Model\Perm::BROWSE) {
         return true;
     }
     return $user->is_root() || in_array(ID_MANAGER, $member->roles) || in_array(ID_TRAINER, $member->roles);
 }