Našeptávač - vrací null

//model
public function getAll($text)
{
$xx = parent::$db->query("SELECT user_name FROM users WHERE user_name LIKE '%$text%' ");
return $xx;
}

//presenter
public function handleAutoComplete($text)
{
$this->payload->autoComplete = array();
$text = trim($text);
 if ($typ_vozidla !== '') {
   $model = new Autocomplete();
   $result = $model->getAll($text); 

   foreach ($result as $n => $row) {
    $this->payload->autoComplete[] = $row->user_name;
   }

$this->sendPayload();
}
}

//sablona
<p>Nick: <input type="text" id="text" /></p>
<script type="text/javascript">
<!--
$('#text').focus().keyup(function(event) {
$.getJSON({link autoComplete!}, {'text': $('#text').val()}, function(payload) {
alert('tu'); 
$('ul').remove();

var list = $('<ul></ul>').insertAfter('#text');

 for (var i in payload.autoComplete) {
  alert(payload.autoComplete[i]);
  $('<li></li>').text(payload.autoComplete[i]).appendTo(list);
 }
});
});
 -->
</script>