Optional embed form in Symfony 2

Question

I have two entities in my system: Person and Phone as the following code.

class Person
{
    /**
     * @ORM\\Id
     * @ORM\\Colum         


        

Answer 1

For those passing by, with newer versions of Symfony you can do :

/**
 *
 * @Assert\Callback()
 */
public function validatePhone(ExecutionContextInterface $context)
{
    if (/* Fields are not empty */)
    {
        $context->validate($this->getPhone(), 'phone', array("phone_validation"));
    }
}