how to create logged in session in yii - yii

Question

i tried using hybrid auth for a facebook login on my yii app, but couldn't get it to work. so decided to work on my own. i managed to get it to retrieve data and store it in my DB. but yii, still doesn't detect user as logged in. here is part of my code in my controllers/FacebookController.php
if (app()->request->isAjaxRequest) {
$user = app()->request->getParam('user');
Shared::debug($user);
// verify one last time that facebook knows this guy
if ($user['id'] === app()->facebook->getUser()) {
if (!empty($user['email']))
{
$model = User::model()->findByEmail($user['email']);
}
else if (!empty($user['username']) && empty($user['email'])) //incase we don't get an email, we use a facebook email
{
$email = $user['username'].'#facebook.com';
$model = User::model()->findByEmail($email);
}
else
{
$model = false;
}
if (!empty($model))
{
// facebook email matches one in the user database
$identity = new UserIdentity( $model->email , null );
$identity->_ssoAuth = true;
$identity->authenticate();
if ($identity->errorCode === UserIdentity::ERROR_NONE) {
print_r($identity);
app()->user->login($identity, null);
echo json_encode(array('error' => false, 'success' => url('/')));
app()->end();
}
else {
echo json_encode(array('error' => 'System Authentication Failed', 'code' => 'auth'));
app()->end();
}
}
in my code above, when i print_r($identity); the object below is echoed. and FYI, the email xxxxxx#facebook.com is stored in the DB but app()->user->isGuest() still returns true. what am i doing wrong here?
UserIdentity Object
(
[_ssoAuth] => 1
[_id:UserIdentity:private] => 19
[username] => xxxxxx#facebook.com
[password] =>
[errorCode] => 0
[errorMessage] =>
[_state:CBaseUserIdentity:private] => Array
(
)
[_e:CComponent:private] =>
[_m:CComponent:private] =>
)

Answer 1

http://yiiframework.com/doc/api/1.1/CWebUser#login-detail
Instead of passing a null into app()->user->login($identity, null) try passing in a duration like
$duration = 3600*24*30; //30 days
app()->user->login($identity, $duration);
I have had problems setting duration to 0. Not sure why either. But this worked for me before