var if defined = true, but not found when i try to dump it

[AlexGavrilov939]

user have a custom property (e,g, Yii::app()->user->color).
how can i use it from twig view ?
I tried this design
{% if app.user.color is defined %}
test msg
{{app.user.color}}
{% endif %}

if returns true but property color not found.
how can this happen?

[samdark]

What do you mean by property color not found?

[resurtm]

What's your configuration file? How your WebUser component and User model looks like?

[AlexGavrilov939]

ok, tell the order)
i have users model
class UsersModel extends CActiveRecord {

public $id;
public $username;
public $password;
public $firstName;
public $lastName;
public $rank;
public $sinceDate;

public function tableName()
{
    return 'users';
}

public static function model($className=__CLASS__)
{
    return parent::model($className);
}

}

and UserIdentity component here:
class UserIdentity extends CUserIdentity
{
private $_id;
public $user;

public function authenticate()
{
    $this->user = UsersModel::model()->findByAttributes(array('username' => $this->username));
    if($this->user === null)
        $this->errorCode=self::ERROR_USERNAME_INVALID;
    else if($this->user->password !== $this->password)
        $this->errorCode=self::ERROR_PASSWORD_INVALID;
    else
    {
        $this->_id = $this->user->username;
        $this->setState('firstName', $this->user->firstName);
        $this->setState('lastName', $this->user->lastName);
        $this->setState('rank', $this->user->rank);
        $this->setState('sinceDate', $this->user->sinceDate);
        $this->errorCode=self::ERROR_NONE;
    }
    return !$this->errorCode;
}

public function getId()
{
    return $this->_id;
}

}

so I have custom properties (firstName, lastName, rank, sinceDate)
I have no problem to use them like this controller:

// of course, this "if" is true
if (isset(Yii::app()->user->firstName)) {
var_dump(Yii::app()->user->firstName);
} else {
var_dump('you do not have such a property');
}

or:
// it also works well and I get the "else" result
if (isset(Yii::app()->user->blablaProperty)) {
var_dump(Yii::app()->user->firstName);
} else {
var_dump('you do not have such a property');
}

I'm trying to play a similar logic in TWIG templates but it does not work:
{% if app.user.blabla is defined %}
{{ app.user.blabla }}
{% endif %}

(expect that this condition is not satisfied because the property does not exist)
but it's true and I get an error:
An exception has been thrown during the rendering of a template ("In class WebUser and his behavior does not find a method or closure named" blabla ".") In "layouts / backend / includes / header.tpl".

in configs i have:
"user" => array(
"class" => "WebUser"
)

my class WebUser until empty and simply inherits CWebUser

why the "IS DEFINED" is true if it is not really so?
p.s. I am sorry if at first misled