Cascading an association - symfony

Question

I am trying to embed a collection of forms, but I am having trouble persisting the newly created objects.
A Customer has many Emails. In my controller,
// CustomersController.php
$customer = new Customer();
$customer->setCreatedBy(0);
$blankEmail = new Email();
$customer->addEmail($blankEmail);
$form = $this->createForm(new CustomerType(), $customer);
I did remember to set the cascade option in my Customer class:
// Customer.php
...
/**
* #ORM\OneToMany(targetEntity="Email", mappedBy="customer", cascade={"persist"})
*/
protected $emails;
My Email class also has the required information:
// Email.php
...
/**
* #ORM\ManyToOne(targetEntity="Customer", inversedBy="emails", cascade={"persist"})
* #ORM\JoinColumn(name="customers_id", referencedColumnName="id")
*/
protected $customer;
For some reason, this doesn't work:
if ($request->isMethod('POST')) {
$form->bind($request);
if ($form->isValid()) {
$em = $this->getDoctrine()->getManager();
$em->persist($customer);
$em->flush();
It adds the customer alright, but when it tries to add the Email, it says no customerId has been set. So, I tried this, and it works:
if ($request->isMethod('POST')) {
$form->bind($request);
if ($form->isValid()) {
$em = $this->getDoctrine()->getManager();
foreach ($customer->getEmails() as $email)
$email->setCustomer($customer);
$em->persist($email);
}
$em->persist($customer);
$em->flush();
But I'd really like to be able to get it in one fell swoop, just by persisting the $customer object (as I know it can).

Answer 1

Try to change the default "addEmail" method in your Customer class.
This method should look like:
public function addEmail($email)
{
$email->setCustomer($this);
$this->emails[] = $email;
return $this;
}