Symfony2 Form Dropping Entity Data - forms

Question

This questions is NOT about how to embed an entity that is simple and straightforward my question is about an abnormality I am seeing and can't reconcile.
I have an Entity (Contact) I have an "Email" relation on this and want to have the ability to embed Emails in my create new method.
So I do the usual embed steps:
1) Add my collection to my form (contactType.php)
->add('emails', 'collection', array(
'type' => new EmailType()
))
2) In the Controller I add a new empty Email entity and set that as my default data for my form
$entity = new Contact();
$email = new Email();
$entity->addEmail($email);
$form->createForm(new ContactType(), $entity);
This is where the issue occurs, going into "createForm" my $entity has a collection called Emails, coming out the $form is a blank ContactType, no Email attached to it... it's as if the defaultData is just being ignored.
If you have seen this or have any idea why this would happen I would love some input.

Answer 1

We have modified our getter to return an Associative Array and this seems to break the Form builder, The following breaks the Form Builder:
public function getContacts()
{
$array = new ArrayCollection();
$property = (is_array($this->contacts)) ? $this->contacts : $array;
foreach($property as $entity)
{
$array[$entity->getType()->getName()] = $entity;
}
return $array;
}
the basic getter is just
return $this->contacts;
Which works, it seems ArrayCollection() isn't a simple Associative Array as we assumed it could be.