saving to same id

hi guys,... I'm having a problem saving to same id,... can someone help please,... 

  function upload($id)

  {

     $group_id = $id;

    $user = $this->User->findById($this->user['id']);

... ... ... ... 

      if($this->Group->save(array('Group' => array('photo_id' => $this->user['id'], 'photo_secret' => $secret, 'hidden' => 0, 'banners' => 1, 'verify' => 1))))

      { 

I want to save to $group_id,... but its create new one in db on every banner upload

how do I insert  ' WHERE id = ' . $group_id

thanks in advance 

chris 

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