Filters in CGridView not filtering - yii

Question

Can You check why filtering is not working in CGridView? When i type for exaple 'Adam' in filter field, nothing happens. I can't find my mistake, everything looks ok but not working. I helped with that article: Yii: CGridView Filter examples
CONTROLLER
<?php
class UzytkownikController extends CController
{
public function actionIndex()
{
$Dane = new Uzytkownik('search');
$Dane -> unsetAttributes(); // clear any default values
if(isset($_GET['Uzytkownik']))
{
$Dane->attributes=$_GET['Uzytkownik'];
}
$this -> render ('index', array(
'Dane' => $Dane,
));
}
}
?>
MODEL
<?php
class Uzytkownik extends CActiveRecord
{
public static function model($className=__CLASS__)
{
return parent::model($className);
}
public function search()
{
$criteria = new CDbCriteria;
$criteria -> compare('imie', $this -> imie, true);
return new CActiveDataProvider($this, array(
'criteria' => $criteria,
)
);
}
}
?>
WIEV
<?php
$this -> widget('zii.widgets.grid.CGridView', array(
'dataProvider' => $Dane -> search(),
'filter' => $Dane,
'columns' => array(
array(
'name' => 'imie',
'type'=>'raw',
),
array(
'name' => 'nazwisko',
'type'=>'raw',
'filter' => false,
),
array(
'name' => 'data',
'filter' => false,
),
),
)
);
?>

Answer 1

For future reference:
In order to make sure the $model->attributes "saves" the attributes the model needed the following addition:
public function rules() {
return array(
array('imie', 'safe', 'on'=>'search')
);
}
And $_GET should have been used instead of $_POST Because the CGridView widget uses GET when posting to the server:
class UzytkownikController extends CController
{
public function actionIndex()
{
$Dane = new Uzytkownik('search');
$Dane -> unsetAttributes(); // clear any default values
if(isset($_GET['Uzytkownik']))
{
$Dane->attributes=$_GET['Uzytkownik'];
}
$this -> render ('index', array(
'Dane' => $Dane,
));
}
}