[DoctrineBridge] DoctrineLoader can't access embedded object properties

[Korbeil]

Symfony version(s) affected: 4.3.0

Description
I just upgraded my application to 4.3.0 and saw this bug.
We have a UserAddress entity:

/**
 * @ORM\Table(name="user_address")
 */
class UserAddress
{
    /**
     * @var Address
     *
     * @ORM\Embedded(class="Address")
     */
    private $address;

    // ...
}

with an embedded object Address:

/**
 * @ORM\Embeddable
 */
class Address
{
    /**
     * @var null|string
     *
     * @ORM\Column(name="first_name", type="string", length=255, nullable=true)
     */
    private $firstName;

    // ...
}

With new Doctrine auto-validation feature, it tries to access address.firstName property, but in https://github.com/symfony/symfony/blob/4.4/src/Symfony/Component/Validator/Mapping/PropertyMetadata.php#L39, we check if given property exists as it's given, so it can't work.

Possible Solution
Use symfony/property-accessor ? Instead of reflection metadata which does not contains embedded objects metadata.

[MinusSevenOfSpades]

Same problem here.

My entity Tag have this property:

/**
* @ORM\Embedded(class="App\Doctrine\Embeddable\TagAdditional")
*
* @var TagAdditional|null
*/
protected $additional;

First property in embeddable generates Symfony\Component\Validator\Exception\ValidatorException exception with message Property "additional.headerText" does not exist in class "App\Entity\Tag".

/**
* @ORM\Column(name="header_text", type="string", length=255, nullable=true)
*
* @Assert\Length(max="250")
*
* @var string|null
*/
protected $headerText;

Updated to Symfony 4.3 hour ago.
Problem can be temporarly fixed if we use doctrine/common:v2.8.1 instead of latest version.

[dunglas]

Shouldn’t it be fixed in the Doctrine loader directly? Simply skipping Embedebbables in the parent class should be enough, and won’t prevent auto-validation to work because metadata are still stored in the child class (to be verified).

I don’t have a computer this weekend, but I’ll try to work on a fix on Monday.

[xabbuh]

I found the root cause. Working on a fix.

[xabbuh]

see #31811

[martiis]

With nested embedded objects it's still the same problem.
f.e. embedded object in embedded object in entity.

[xabbuh]

@martiis Can you open a new issue and provide a small example application that allows to reproduce?

[martiis]

sure, but in about 1-2 hours, commuting :)