Can't validate model ?!

Hey everybody,

I'm new to CakePHP, so don't shoot me if I made a stupid mistake.
I'm having a problem validating my model I created. I think I done
everything right, but it doesnt' work.
I already took a look at http://book.cakephp.org/view/1143/Data-Validation
and http://book.cakephp.org/view/1182/Validating-Data-from-the-Controller.
According to the cookbook I done it right but somehow I can't get my
model to be validated.

This is my code so far:

My Link_controller.php
<?php

class LinksController extends AppController
{
var $name = 'Links';
var $helpers = array('Html','Session');

function index()
{
$this->set("links",$this->Link->find('all'));
}

function add()
{
if(isset($this->data))
{
$this->Link->set($this->data);
if($this->Link->validates())
{
debug($this->data);
//if($this->Link->save($this->data))
$this->Session->setFlash('Data Saved Succesfully');
}
}

}
}

?>

If i don't type anything in my form my add method gets to the debug
statement. Which I find strange because I use the isset($this->data).
my debug print out looks like this :
Array
(
[Link] => Array
(
[link_name] =>
[link_url] =>
[link_category] =>
[link_img_url] =>
)

)

my link model
<?php
class Link extends AppModel
{
var $name = 'Link';

var $validate = array(
'link_name' => array(
'rule' => 'notEmpty'
),
'link_url' => array(
'rule' => 'notEmpty'
)
);

/* var $validate = array(
'link_name' => array(
'link_name_rule1' => array(
'rule' => 'alphaNumeric',
'message' => 'Link name can only contain numbers and letters'
),
'link_name_rule2' => array(
'rule' => array('macLength',50),
'message' => 'Link name can maximum have 50 characters'
),
'link_name_rule3' => array(
'rule' => 'notEmpty',
'message' => 'The field cannot be empty'
),
'link_name_rule4' => array(
'rule' => 'isUnique',
'message' => 'The field must be unique'
)
),
'link_url' => array(
'link_url1' => array(
'rule' => 'notEmpty',
'message' => 'The url cannot be empty'
),
'link_url2' => array(
'rule' => array('url',true),
'message' => 'The given input isnot a valid url'
)
),
'link_category' => array(
'link_category' => array(
'rule' => 'notEmpty',
'message' => 'The category cannot be empty'
),
'link_category' => array(
'rule' => array('between',1,3),
'message' => 'The image category must be 1,2 or 3'
)
),
'link_img_url' => array(
'link_img_url1' => array(
'rule' => 'notEmpty',
'message' => 'The image url cannot be empty'
),
'link_img_url2' => array(
'rule' => array('extension',array('gif','jpeg','png','jpg')),
'message' => 'Please supply a valid image'
)
)
);*/
}
?>
I first tried some simple rules but they also don't seem to work.

and my add view:

<?php
echo $form->create('Link');
echo $form->input('link_name');
echo $form->input('link_url');
echo $form->input('link_category');
echo $form->input('link_img_url');
echo $form->end('Add Link');
?>

I find it really strange could some one please help me find this
stupid bug ?

Thanks a lot,

cheers

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