updating record

Hi guys,
Again getting a problem as i am new to cake,
I have a table having 10 fields, now i want to update three of them
but cake did not allow me to do so

table structure

campaigns
----------------
id
name
users
url
type
category
logo
|
and so on

now i just want to update users and url my form look like this

<?php echo $form-
>create('',array('controller'=>'campaigns','action'=>'update'))
echo $form->input('Campaign.users');
echo $form->input('Campaign.url');
echo $form->submit('Save');

?>

when i debug($this->data) it gives correct values

but the data is never been saved with the following code

$this->Campaign->save($this->data) ;

please help

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