cakePHP unique email username

cakePHP unique email username

I just need a bit of help with identifying the email of the user which is
also the username in the database, I used the 'isUnique' in the model but
for some reason it is not giving an error message and it still registers
the user please can someone give me a bit of help here is the code...
MODEL
App::uses('AuthComponent','Controller/Component');
class User extends AppModel
{
var $name = 'User';
public $validate = array(
'email' => 'email',
'email' => array(
'required' => array(
'rule' => array('notEmpty'),
'message' => 'Please enter a valid email address for username',
'unique' => array(
'rule' => 'isUnique',
'message' => 'Please enter another email, this one is already taken'
)
)
),
'password' => array(
'required'=> array(
'rule' => array('notEmpty'),
'message' => 'Please enter a valid password',
'rule' => array('minLength','8'),
'message' => 'Please enter minimum 8 characters'
)
)
);
public function beforeSave($options = array()) {
if (isset($this->data[$this->alias]['password'])) {
$this->data[$this->alias]['password'] =
AuthComponent::password($this->data[$this->alias]['password']);
}
return true;
}
}
**CONTROLLER**
<?php
class usersController extends AppController
{
public function beforeFilter() {
parent::beforeFilter();
$this->Auth->allow('add');
}
var $name = 'Users';
public function add()
{
if (!empty($this ->data))
{
$this->User->create();
if ($this->User->save($this->data))
{
$this->Session->setFlash('Thank you for registering');
$this->redirect(array('action'=>'index'));
}
else
{
// Make the password fields blank
unset($this->data['User']['password']);
unset($this->data['User']['confirm_password']);
$this->Session->setFlash('An error occurred, try again!');
}
}
}
function index()
{
}
public function login() {
if ($this->request->is('post')) {
if ($this->Auth->login()) {
return $this->redirect($this->Auth->redirectUrl());
}
$this->Session->setFlash(__('Invalid username or password, try
again'));
}
}
public function logout() {
return $this->redirect($this->Auth->logout());
}
}
VIEW
<h2>End a problem registration</h2>
<p>Please fill out details to register</p>
<?php
echo $this->Form->Create('User',array('action' => 'add'));
echo $this->Form->input('title');
echo $this->Form->input('name');
echo $this->Form->input('surname');
echo $this->Form->input('email');
echo $this->Form->input('password');
echo $this->Form->input('password');
echo $this->Form->end('Register');