Add support for Symfony NotBlank Constraint

it does not work at all.

namespace Drupal\field_validation\Plugin\Validation\Constraint;

use Symfony\Component\Validator\Constraints\NotBlank;

/**
 * NotBlank constraint.
 *
 * Overrides the symfony constraint to use Drupal-style replacement patterns.
 *
 * @Constraint(
 *   id = "NotBlank",
 *   label = @Translation("NotBlank", context = "Validation")
 * )
 */
class NotBlankConstraint extends NotBlank {

  public $message = 'This value should not be blank.';

  /**
   * {@inheritdoc}
   */
  public function validatedBy() {
    return '\Drupal\field_validation\Plugin\Validation\Constraint\NotBlankConstraintValidator';
  }

}

namespace Drupal\field_validation\Plugin\Validation\Constraint;

use Drupal\Core\TypedData\ComplexDataInterface;
use Drupal\Core\TypedData\ListInterface;
use Drupal\Core\TypedData\Validation\TypedDataAwareValidatorTrait;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\Constraints\NotBlankValidator;

/**
 * NotBlank constraint validator.
 *
 * Overrides the symfony validator to handle empty Typed Data structures.
 */
class NotBlankConstraintValidator extends NotBlankValidator {

  use TypedDataAwareValidatorTrait;

  /**
   * {@inheritdoc}
   */
  public function validate($value, Constraint $constraint) {
	\Drupal::messenger()->addMessage("not blank123:");  
    $typed_data = $this->getTypedData();
    if (($typed_data instanceof ListInterface || $typed_data instanceof ComplexDataInterface) && $typed_data->isEmpty()) {
      $value = NULL;
    }
	\Drupal::messenger()->addMessage("not blank:".var_export($value, true));
    parent::validate($value, $constraint);
  }

}

strange thing happens.

after some research, find it register by drupal core:

 public function registerDefinitions() {
    $this->getDiscovery()->setDefinition('Callback', [
      'label' => new TranslatableMarkup('Callback'),
      'class' => '\Symfony\Component\Validator\Constraints\Callback',
      'type' => FALSE,
    ]);
    $this->getDiscovery()->setDefinition('Blank', [
      'label' => new TranslatableMarkup('Blank'),
      'class' => '\Symfony\Component\Validator\Constraints\Blank',
      'type' => FALSE,
    ]);
    $this->getDiscovery()->setDefinition('NotBlank', [
      'label' => new TranslatableMarkup('Not blank'),
      'class' => '\Symfony\Component\Validator\Constraints\NotBlank',
      'type' => FALSE,
    ]);
    $this->getDiscovery()->setDefinition('Email', [
      'label' => new TranslatableMarkup('Email'),
      'class' => '\Drupal\Core\Validation\Plugin\Validation\Constraint\EmailConstraint',
      'type' => ['string'],
    ]);
  }

If you apply not blank to a field property, if it is main property, it not works as your expect. if drupal field is empty, it skip validation, which means it skip NotBlank constraint.

A use case for not blank, for body field, apply NotBlank to its summary property, if you set body some text, and leave summary empty,
you will get the error.

Automatically closed - issue fixed for 2 weeks with no activity.