Symfony2 - Validation not working for embedded Form Type

Question

I have a form that combines two entities (User and Profile).

Validation seems to work on the first part of the form that comes form the User Entity and is the basis

Answer 1

According to form type documentation you can also use Valid constraint instead of cascade_validation option.

$builder->add('children', 'collection', array(
    'type'        => new ChildType(),
    'constraints' => array(new Valid()),
));

Example from the owner entity:

/**
 * @var Collection
 *
 * @ORM\OneToMany(targetEntity="Child", ...)
 * @Assert\Valid()
 */
private $children

Answer 2

I was looking for the exact same thing and here is what I found

http://symfony.com/doc/master/book/forms.html#forms-embedding-single-object

You need to tell the main entity to validate it's sub entities like so:

/**
 * @Assert\Type(type="AppBundle\Entity\Category")
 * @Assert\Valid()
 */
 private $subentity;

I've tested this on symfony 2.8 and it works.