class UniqueFieldConstraint in Drupal 8

Checks if an entity field has a unique value.

Plugin annotation

@Constraint(
  id = "UniqueField",
  label = @Translation("Unique field constraint", context = "Validation"),
)

Hierarchy

• class \Drupal\Core\Validation\Plugin\Validation\Constraint\UniqueFieldConstraint extends \Symfony\Component\Validator\Constraint

4 files declare their use of UniqueFieldConstraint

FeedTitleConstraint.php in core/modules/aggregator/src/Plugin/Validation/Constraint/FeedTitleConstraint.php

FeedUrlConstraint.php in core/modules/aggregator/src/Plugin/Validation/Constraint/FeedUrlConstraint.php

UserMailUnique.php in core/modules/user/src/Plugin/Validation/Constraint/UserMailUnique.php

UserNameUnique.php in core/modules/user/src/Plugin/Validation/Constraint/UserNameUnique.php

File

core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/UniqueFieldConstraint.php, line 15

Namespace

Drupal\Core\Validation\Plugin\Validation\Constraint

class UniqueFieldConstraint extends Constraint {
  public $message = 'A @entity_type with @field_name %value already exists.';

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

}

Members

Name	Modifiers	Type	Description	Overrides
UniqueFieldConstraint::$message	public	property		4
UniqueFieldConstraint::validatedBy	public	function	Returns the name of the class that validates this constraint.