cakephp 2.0 - How can I use Sessions and Auth cross controller? -

i have 2 controllers need communicate orderscontroller , userscontroller, because when new user places order process register form on order send userscontroller::register().

my register action uses auth log in user after basket processed returns fatal error: call member function login() on non-object:

//userscontroller::register($data = null) if(!empty($data))   $this->request->data['user'] = $data;  if ($this->user->save($this->request->data)) {   $registereduser = $this->user->read(null, $this->user->id);   if ($this->auth->login($registereduser['user']))     if (empty($data))        $this->redirect($this->auth->redirect());     else        return $this->user->id; } 

i use action on normal registration page , other apis google or facebook inside userscontroller calling $this->register($data) , workes fine. when use in orderscontroller like:

//userscontroller::__construct() public function __construct($request = null, $response = null, $session = null) {     parent::__construct($request, $response);     if (isset($session))         $this->session = $session; } 

i had override __construct because had same problem setflash()

//orderscontroller::add(); $newuser = new userscontroller(null, null, $this->session); $newuserid = $newuser->register($data['user']);