AJAX update of related model

Hello All,
I have two models PhdUser and PhdApplication.
I'm trying to update information in PhdApplication using the following
controller. (note: this works fine with data in PhdUser, and their
linked correctly)

function ajaxupdate($userID = null,$sub) {

//Step 1. Update the value in the database
$value = $this->params['form']['value']; //new value to save
$this->PhdUser->id = $userID;
if (!$this->PhdUser->saveField($sub, $value,true)) { // Update the
field
$this->set('error', true);
}

//Step 2. Set the view variable and render the view.
$this->set('value',$value);
$this->beforeRender();
$this->layout = 'ajax';
}

And I'm using this as the editor:

<?php
echo $ajax->editor(
'divSubmitted',
array(
'controller' => 'PhdUsers',
'action' => 'ajaxupdate',
$phd_users['PhdUser']['userID'],
'/submitted'
),
array('collection' => array(array('no','no'), array('yes','yes'))));

However I'm not getting it to save to PhdApplication.

Is there something obvious I'm missing? Do I need to put an ajaxupdate
function in each controller?

thanks so much for taking the time to look this over (if you've gotten
this far)
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