SELECT in cake php - cakephp

Question

In this form I can't see name of select, this dropdown don't work, my code is:
In the controller I have:
public function admin_cambiar_centro() {
$this->Session->write(
'Auth.User.centro_id',
$this->request->data('CambioCentro.centro_id')
);
$this->redirect($this->referer());
}
In the view:
<?= $this->Form->create('CambioCentro', array(
'url' => array(
'controller'=> 'Users',
'action' => 'cambiar_centro'
)
)) ?>
<?= $this->Form->select('centro_id',
Hash::combine(AuthComponent::User('Centro'), '{n}.id', '{n}.nombre'),
array(
'empty' => false,
'value' => AuthComponent::User('centro_id'),
'style' => 'margin-top: 7px;',
'onchange' => 'this.form.submit()',
)); ?>
<?=$this->Form->end()?>
and this does not deploy I would be very grateful if you could help me

Answer 1

It looks like your form url is not correct. Try to add admin => true to the form's url.
<?=$this->Form->create('CambioCentro', array('url' =>
array('controller'
=> 'Users', 'action' => 'cambiar_centro', 'admin' => true)))?>
Another potential problem is that you are writing to the session and redirecting on every request, so you may create a redirect loop, and also on get request the session variable gets overwritten.
Check the request type in the action:
public function admin_cambiar_centro() {
if($this->request->is('post')) {
$this->Session->write('Auth.User.centro_id',
$this->request->data('CambioCentro.centro_id'));
return $this->redirect($this->referer());
}
}