cant save multiple tables in cakephp - php

Question

I am learning cakephp and have made quite a bit already. The only reason I am asking this question is that the docs in cakePHP could be wrong.
I cant see from the docs or past stackoverflow posts on this issue why the (child)Teacher table doesnt save the user_id from the id table in the (parent)User table.
I get no error but the user_id is 0 in the Teacher table so it isnt picking it up from the User table.
I have a one-one relationship on the 2 models.
I am just testing saving over 2 models where I have a User and teacher. I simply enter data in a form and create a new User and also a new teacher with the user_id being a foreign key in the teacher table.
I am loathe to ask this question as there is a lot of material on this but I just cant see my issue after following the docs in cakePHP.
http://book.cakephp.org/2.0/en/models/saving-your-data.html
public function addteacher() {
if ($this->request->is('post')) {
$this->User->create();
}
if (!empty($this->request->data)) {
// We can save the User data:
// it should be in $this->request->data['User']
$user = $this->User->save($this->request->data);
// If the user was saved, Now we add this information to the data
// and save the Profile.
if (!empty($user)) {
// The ID of the newly created user has been set
// as $this->User->id.
$this->request->data['teacher']['user_id'] = $this->User->id; //here is the problem
// Because our User hasOne Profile, we can access
// the Profile model through the User model:
if ($this->User->Teacher->save($this->request->data))
{
$this->Session->setFlash(__('Your post has been saved.'));
return $this->redirect(array('action' => 'login'));
}
}
}
}
<?php
echo $this->Form->create('User');
echo $this->Form->input('User.username');
echo $this->Form->input('User.password');
echo $this->Form->input('Teacher.firstname'); //text
echo $this->Form->input('Teacher.surname');
echo $this->Form->input('Teacher.address'); //text
echo $this->Form->input('Teacher.suburb');
echo $this->Form->input('Teacher.phone');
echo $this->Form->end('Save Post');
?>

Answer 1

$this->request->data['teacher']['user_id'] = $this->User->id;
should be
$this->request->data['Teacher']['user_id'] = $this->User->id;.
Capital "T". Model names are always CamelCased.
That said there is no need for 2 saves. You can just use
$this->User->saveAll($this->request->data);.
It will save both the User record and Teacher record adding proper foreign key value for the Teacher record (assuming you have setup proper association between User and Teacher model).