Simple Auth not working when models are defined

[Aaron]

I'm attempting to use the Auth component to do pretty basic auth with
no acl in cake 1.2.x.x trunk.

It seems to be working fine when I have controllers but no explicit
models classes defined.  However, once I declare a simple model class
I see the following error no matter which action I navigate to:

Warning (2): Cannot modify header information - headers already sent
by (output started at /home/aaron/workspaces/CakePHP/cake/libs/
controller/components/auth.php:226) [CORE/cake/libs/controller/
controller.php, line 576]

Code | Context

$status =       "Location: http://sharecake/users/login";

header - [internal], line ??
Controller::header() - CORE/cake/libs/controller/controller.php, line
576
Controller::redirect() - CORE/cake/libs/controller/controller.php,
line 557
AuthComponent::startup() - CORE/cake/libs/controller/components/
auth.php, line 326
Component::startup() - CORE/cake/libs/controller/component.php, line
98
Dispatcher::start() - CORE/cake/dispatcher.php, line 307
Dispatcher::dispatch() - CORE/cake/dispatcher.php, line 219
[main] - APP/webroot/index.php, line 86

The model (User in this case) is an empty class that just extends
AppModel.  Once I delete the model class it works again.

My controller class looks like:

<?php

class UsersController extends AppController {

        var $helpers = array('Html','Form');


        function login() {
        }

        function logout() {
                $this->Session->destroy();
                $this->redirect($this->Auth->logout());
        }

        function register() {
                if ($this->Auth->user()) {
                        $this->Session->setFlash('User already logged in');
                        $this->redirect($this->Auth->redirect());
                        exit(0);
                }
                $this->pageTitle = 'Register User';
                if (!empty($this->data)) {
                        if ($this->User->save($this->data['User'])) {
                                $this->Session->setFlash('User Registered!');
                                $this->redirect('/users/login');
                                exit(0);
                        }
                }


        }

        function home() {
        }
}

?>

If I define another controller with no model class defined it works
when using the new controller.  But once I define the model class it
breaks again.

Any ideas on what I'm missing?

app_controller.php looks like:

class AppController extends Controller {
        var $components = array('Auth');

        function beforeFilter() {
                parent::beforeFilter();
//              $this->Auth->fields = array('username' => 'userid','password' =>
'password');
                $this->Auth->allow('register');
//              $this->Auth->autoRedirect = false;
//              $this->Auth->loginRedirect = array('controller' => 'users',
'action' => 'home');
                $this->layout = 'sharecake';
        }
}

-Aaron

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