friends and self HABTM

I am trying to build a simple social network type site where a user
can friend another user. I realize this has been discussed before, a
lot, but none of the discussions on here really point out my issue so
I thought someone might be able to shine some light on where I am
going astray.

My user model

var $hasAndBelongsToMany = array(
'Friend' => array (
'className' => 'User',
'joinTable' => 'users_users',
'foreignKey' => 'user_id',
'associationForeignKey' => 'friend_id'
)
);

My users_controler addfriend fuction

function addfriend() {
if (!empty($this->data)) {
$user_id = $this->Auth->user('id'); // sets user_id in friend table
to authed user
//debug($this->data);exit;
if ($this->User->UsersUser->save($this->data))
{
$this->Session->setFlash(__('The User has been saved', true));
$this->redirect($this->referer());

} else {
$this->Session->setFlash(__('The User
could not be saved. Please, try again.', true));
debug($this->data);exit;
}
}
}

My old school form on the user/view page for adding a user just so i
can see whats going on for now
<form id="addfriend" method="post" action="/users/addfriend">
<fieldset style="display:none;"><input type="hidden" name="_method"
value="POST" /></fieldset>
<input name="data[Users_users][user_id]" type="text" value="<?
echo( $auth['User']['id']); ?>" id="user_id" />
<input name="data[Users_users][friend_id]" type="text" value="<?
echo( $user['User']['id']); ?>" id="friend_id" />

<?php echo $form->end('Submit');?>

I have a database table called users_users with an id, user_id, and
friend_id columns. When I manually input data everything works fine.
So I know my associations are proper.

However, when I submit my form with known good information nothing
goes into the database table. So I debuged the data that I am passing
to from the addfriend function and I get the following:

app/controllers/users_controller.php (line 402)

Array
(
[Users_users] => Array
(
[user_id] => 1
[friend_id] => 79
)

)

If anyone could point out what might be going wrong I would greatly
appreciate it.

Thanks.

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