I've been working on this all day:
http://rtfm.modx.com/display/revolution20/Extending+modUser
Long story short: I've got things working, and I can do a simple Snippet that lets me save my new user class extUser.
$username = 'test';
$modx->addPackage('extendeduser', MODX_CORE_PATH . 'components/extendeduser/model/', 'ext_');
$user = $modx->newObject('extUser', array('username'=>$username));
$data = $modx->newObject('Userdata');
$data->set('extra_field', 'xxxxxx');
$user->addOne($data, 'Data');
if (!$user->save()) {
return 'Problem...';
}
return 'Ok!';
But when I try to use this in a postHook (for the Register Snippet), the user data gets saved incorrectly: only the core user attributes are saved, the class_key is saved as "modUser", and the extended "Userdata" stuff doesn't get saved at all. Any ideas?
Actually, I think I just thought of something: the saving should be a prehook instead... since I think the Register Snippet must be creating the user already, and when I try to re-create it, it fails. That might be why the class_key is being populated as "modUser" instead of my "extUser"...
A couple related notices from the PHP logs:
PHP Notice: Undefined index: username in /core/components/login/model/login/loginhooks.class.php on line 183
PHP Notice: Undefined index: hook in /core/components/login/model/login/loginhooks.class.php on line 137
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