some session problem in cakephp 1.3 (help me)

i have this app_controller code in cakephp 1.2:

<?php
class AppController extends Controller {
var $helpers = array('Html', 'Form', 'Javascript');
/**
* Array of components to load for every controller in the
application
*
* @var $components array
* @access public
*/
var $components = array('Auth');
/**
* beforeFilter
*
* Application hook which runs prior to each controller action
*
* @access public
*/
function beforeFilter(){

if (isset($this->params['admin'])) {
// Set the default layout
$this->layout = 'admin';
}else {
$this->layout = 'default';
}
//Override default fields used by Auth component
$this->Auth->fields =
array('username'=>'email_address','password'=>'password');
//Set application wide actions which do not require
authentication
$this->Auth-
>allow(array('display','view','admin_login','index','pindex'));//
IMPORTANT for CakePHP 1.2 final release change this to $this->Auth-
>allow(array('display'));
//Set the default redirect for users who logout
$this->Auth->logoutRedirect = '/';
//Set the default redirect for users who login
$this->Auth->loginRedirect = '/admin/images/index';
//Extend auth component to include authorisation via
isAuthorized action
$this->Auth->authorize = 'controller';
//Restrict access to only users with an active account
$this->Auth->userScope = array('User.active = 1');
//Pass auth component data over to view files
$this->set('Auth',$this->Auth->user());
}

/**
* beforeRender
*
* Application hook which runs after each action but, before the
view file is
* rendered
*
* @access public
*/
function beforeRender(){
//If we have an authorised user logged then pass over an array
of controllers
//to which they have index action permission
if($this->Auth->user()){
$controllerList = Configure::listObjects('controller');
$permittedControllers = array();
foreach($controllerList as $controllerItem){
if($controllerItem <> 'App'){
if($this->__permitted($controllerItem,'index')){
$permittedControllers[] = $controllerItem;
}
}
}
}
$this->set(compact('permittedControllers'));
}
/**
* isAuthorized
*
* Called by Auth component for establishing whether the current
authenticated
* user has authorization to access the current controller:action
*
* @return true if authorised/false if not authorized
* @access public
*/
function isAuthorized(){
return $this->__permitted($this->name,$this->action);
}
/**
* __permitted
*
* Helper function returns true if the currently authenticated
user has permission
* to access the controller:action specified by $controllerName:
$actionName
* @return
* @param $controllerName Object
* @param $actionName Object
*/
function __permitted($controllerName,$actionName){
//Ensure checks are all made lower case
$controllerName = low($controllerName);
$actionName = low($actionName);
//If permissions have not been cached to session...
if(!$this->Session->check('Permissions')){
//...then build permissions array and cache it
$permissions = array();
//everyone gets permission to logout
$permissions[]='users:logout';
//Import the User Model so we can build up the permission
cache
App::import('Model', 'User');
$thisUser = new User;
//Now bring in the current users full record along with
groups
$thisGroups = $thisUser->find(array('User.id'=>$this->Auth-
>user('id')));
$thisGroups = $thisGroups['Group'];
foreach($thisGroups as $thisGroup){
$thisPermissions = $thisUser->Group-
>find(array('Group.id'=>$thisGroup['id']));
$thisPermissions = $thisPermissions['Permission'];
foreach($thisPermissions as $thisPermission){
$permissions[]=$thisPermission['name'];
}
}
//write the permissions array to session
$this->Session->write('Permissions',$permissions);
}else{
//...they have been cached already, so retrieve them
$permissions = $this->Session->read('Permissions');
var_dump($permissions);

}
//Now iterate through permissions for a positive match
foreach($permissions as $permission){
if($permission == '*'){
return true;//Super Admin Bypass Found
}
if($permission == $controllerName.':*'){
return true;//Controller Wide Bypass Found
}
if($permission == $controllerName.':'.$actionName){
return true;//Specific permission found
}
}
return false;
}
}
?>

when i am run this code in cakephp 1.3 i dont see variable in session
(var_dump($permissions);)

where is problem?

note: this code for "cakephp user Auth"

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