Updating Record - Reset Password

Hi I'm having problem with this method,
it is not saving or updating,
can you please help me and tell me what is wrong with the code below.
I'm Using cakephp 1.2.5

public function reset_password()
{

if(!empty($this->data))
{
if(!empty($this->data['User']['email']))
{
$this->User->unBindAll();
$user = $this->User->findByEmail($this->data['User']['email']);
if(!empty($user))
{
$this->User->id = $user['User']['id'];
$data['User']['id'] = $user['User']['id'];
$data['User']['tmp_password'] = $this->generate_password(7);
$data['User']['password'] = $this->Auth->password($data['User']
['tmp_password']);
if($this->User->save($data))
{
$this->Session->setFlash('Password Successfully Changed<br /
>Please check you email.','flash');
}
}
else
{
$this->Session->setFlash('Email address is not on the
database.','flash');
}
}
else
{
$this->Session->setFlash('Email address cannot be
empty.','flash');
}
}
}

public function generate_password($len)
{
$pass = '';
$lchar = 0;
$char = 0;
for($i=0;$i<$len;$i++)
{
while($char==$lchar)
{
$char = rand(48, 109);
if($char>57)$char+=7;
if($char>90)$char+=6;
}
$pass .= chr($char);
$lchar = $char;
}
return $pass;
}

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