updating an existent field

[Fabrizio Mancini]

Hi all,
i'm very new to cake but i like it a lot!! great work!
at the moment im in trouble with a field update. I cannot understand how to do it.
Let me explain:
the user comes to my site and register himself. he receive an email with an activation code, then he clicks on the link in the email, and i read the code he passed in the url string. now i want to update the field "subscribed" from 0 to 1 for that user only.
the code
Users model ... yada yada
Users Controller ... yada yada

$subscribed=$this->User->find("oid = '$userOid'");
if (!empty($subscribed) && $subscribed['User']['subscribed'] == 0)
{
// this line of code is creating a lot of trouble!
    $this->data['User']['subscribed'] = 1;
    if (!$this->User->save($this->data['User'])) {
        $this->redirect('/errorpage');
    };
    $this->render('activationCompletePage');
};

i receive the user record by the method find, but when i put $this->data['User']['subscribed'] = 1 and save the record, it saves a new record with all the fields empty but with the field subscribed  = 1.
What i'm doing wrong? how can i update that field?
thanks in advance
fabrizio

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