PhalconPHP Framework - How to update a model object and the related object

PhalconPHP Framework - How to update a model object and the related object

I am working with PhalconPHP and so far I have had little problems. The
framework is very good. However, I've run into a problem that I haven't
been able to sort out. It's probably a very simple thing but I've been
running in circles, and couldn't find any reference to this problem.
The problem is I cannot update a model object if I also update a related
entity.
For example, let's suppose I have a couple of model classes.
Contact:
class Contact extends \Phalcon\Mvc\Model
{
public function initialize()
{
$this->belongsTo('email_id', 'Email', 'id', ['alias' => 'Email']);
}
}
And Email:
class Email extends \Phalcon\Mvc\Model
{
public function initialize()
{
$this->hasMany('id', 'Contact', 'email_id', ['alias' => 'Contacts']);
}
}
When I try to create a new Contact and Email the following works:
$contact = new Contact();
// ... assign other fields here (i.e. name)
$email = new Email();
// ... assign other email fields here (i.e. address)
$contact->setEmail($email); // or $contact->email = $email;
$contact->save();
// record created
However, when I try to update a Contact and change the Email relation, the
information is just not updated:
// Only update other fields
$contact->name = 'Some other name';
$contact->save(); // This works
// Update the related object
$contact->name = 'A new name';
$contact->setEmail($anotherValidEmail);
$contact->save(); // This doesn't work! Not even the name field is updated
I have tried using update() instead of save().
I have tried using $contact->email = $newEmailObject as well, but I get
the same results.
Have anyone ran into this problem? What am I doing wrong?
I'm using Mac OS X, PhalconPHP 1.2.3
I've also tested it on Windows 8, with PhalconPHP 1.1.0
Any help is appreciated.