$ajax->autoComplete

Hello everyone,
this issue ...
I have an autocomplete text field that displays the field
"codice" but i would assign the value "cod_mezzi".
I state that the table does not use conventional names.
These lines that I wrote.

model mean.php

<?php
class mean extends AppModel
{
 var $name = 'mean';
 var $useDbConfig = 'ufficial_intranet';
 var $useTable = 't_mezzi';
 var $primaryKey ='cod_mezzi';

var $hasMany = array(
                    'Reservation' => array(
                    'className' => 'Reservation',
                    'foreignKey' => 'mean_id',
                    'dependent' => false,
                    'conditions' => '',
                    'fields' => '',
                    'order' => '',
                    'limit' => '',
                    'offset' => '',
                    'exclusive' => '',
                    'finderQuery' => '',
                    'counterQuery' => ''
 )
 );
 }
 ?>
model reservation.php
<?php
class reservation extends AppModel {

var $name = 'reservation';

var $belongsTo = array(
                         'Place' => array(
                         'className' => 'Place',
                         'foreignKey' => 'place_id',
                         'conditions' => '',
                         'fields' => '',
                         'order' => ''
                         ),
                        'Mean' => array(
                        'className' => 'Mean',
                        'foreignKey' => 'mean_id',
                        'conditions' => '',
                        'fields' => '',
                        'order' => ''
 )
 );
 }
 ?>

means_controller.php

<?php
class MeansController extends AppController {

var $name = 'Means';
var $helpers = array('Html', 'Form', 'Ajax', 'Javascript');

.....
.....
function autoComplete() {

$means = $this->Mean->find('all', array(
'conditions' => array(
'Mean.codice LIKE' => '%' . $this->data['Mean']['codice'].'%'
),
'fields' => array('cod_mezzi','codice')));

$this->set(compact('means'));

if(isset($this->params['requested'])) {
return $means;

}
$this->set('means', $means);
$this->layout = 'ajax';
}
.......
.......
?>

reservations_controller.php

<?php
class ReservationsController extends AppController {

var $name = 'Reservations';
var $helpers = array('Html', 'Form');
......
......
function add() {
if (!empty($this->data)) {
$this->Reservation->create();
if ($this->Reservation->save($this->data)) {
$this->Session->setFlash(__('The Reservation has been saved', true));
$this->redirect(array('action'=>'index'));
} else {
$this->Session->setFlash(__('The Reservation could not be saved.
Please, try again.', true));
}
}
$places = $this->Reservation->Place->find('list');
$means = $this->Reservation->Mean->find('list');
$this->set(compact('places', 'means'));
}
......
......
?>

view reservation add.ctp

<?php echo $form->create('Reservation');?>
<fieldset>
<legend><?php __('Add Reservation');?></legend>
<?php
echo $form->input('place_id');
echo $form->input('from');
echo $form->input('to');

// this show the field "codice", it's ok ... how can I
assign the value cod_mezzi ???
echo $ajax->autoComplete('codice', '/means/autoComplete');

?>
</fieldset>

<?php echo $form->end('Submit');?>
</div>

thanks for the help.

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