Symfony2 conditional form validation - validation

Question

I have some difficulties about applying validation for only one associated entity.
So I have two entities, News and NewsTranslation. A news could be translated in multiple languages. But I would like to apply validation only if locale is en.
// AppBundle/Entity/News.php
class News
{
use ORMBehaviors\Translatable\Translatable;
use ORMBehaviors\Timestampable\Timestampable;
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var int
*
* #ORM\Column(name="status", type="smallint")
* #Assert\NotBlank
*/
private $status;
...
}
// AppBundle/Entity/NewsTranslation.php
class NewsTranslation
{
use ORMBehaviors\Translatable\Translation;
/**
* #var string
*
* #ORM\Column(name="title", type="string", length=255, nullable=true)
* #Assert\NotBlank
* #Assert\Length(max = 255)
*/
private $title;
/**
* #var string
*
* #ORM\Column(name="text", type="string", nullable=true)
* #Assert\NotBlank
*/
private $text;
}
# AppBundle/Resources/config/validation.yml
AppBundle\Entity\News:
properties:
translations:
- Valid: ~
I tried to use a Closure for the validation_groups form option. But it looks like Symfony do validation on News entity and Valid constraint apply the same groups on NewsTranslation.
I know I could use Callback constraint but that's mean to redo NotBlank, Length and other exiting constraints by myself. And I would like to avoid it if possible.
EDIT:
I'm using Symfony 2.8.*
I try using an en validation group. But looks like the validation is launch on News entity with validation_groups. And with Valid constraint the en validation group is given to validate NewsTranlation. So even it's the en or fr translation the group change nothing in this case.
I also try using the validation medatada through an #Assert\Callback or by using loadValidatorMetadata method into NewsTranslation entity. And the problem stay similar. I can't apply an constraint for a specific entity of collection.

Answer 1

I finally found a way by creating a custom validator.
Like this I could use core constraints easily.
In the translation entity, I could use my validator like this:
/**
* #var string
*
* #ORM\Column(name="title", type="string", length=255, nullable=true)
* #Assert\Length(max = 255)
* #AppAssert\ValidTranslation(locales = {"fr"}, constraints = {
* #Assert\NotBlank
* })
*/
private $title;
And the validator:
<?php
namespace AppBundle\Validator\Constraints;
use Symfony\Component\Validator\Constraints\Composite;
/**
* #Annotation
* #Target({"PROPERTY", "METHOD", "ANNOTATION"})
*
* #author Nicolas Brousse
*/
class ValidTranslation extends Composite
{
public $locales = array();
public $constraints = array();
public function getCompositeOption()
{
return 'constraints';
}
public function getRequiredOptions()
{
return array('locales', 'constraints');
}
}
<?php
namespace AppBundle\Validator\Constraints;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Context\ExecutionContextInterface;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;
/**
* #author Nicolas Brousse
*/
class ValidTranslationValidator extends ConstraintValidator
{
/**
* If property constraint
* {#inheritdoc}
*/
public function validate($value, Constraint $constraint)
{
if (!$constraint instanceof ValidTranslation) {
throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\ValidTranslation');
}
if (false) { // #todo check by interface or trait
throw new UnexpectedTypeException($value, 'not a translation entity');
}
$context = $this->context;
$entity = $this->context->getObject();
if (in_array($entity->getLocale(), $constraint->locales)) {
$context = $this->context;
if ($context instanceof ExecutionContextInterface) {
$validator = $context->getValidator()->inContext($context);
$validator->validate($value, $constraint->constraints);
} else {
// 2.4 API
$context->validateValue($value, $constraint->constraints);
}
}
}
}

Answer 2

you form need to return 2 validations_groups, "Default" and the validation group corresponding to the "en" locale