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- <?php
- namespace Drupal\Core\TypedData;
- /**
- * A typed data definition class for the entity reference target_id property.
- *
- * The target_id property differs from other data definitions in that it is
- * required at the storage level, but not at the validation level. This is
- * because its value can be set just-in-time using the preSave() method.
- *
- * Validation for the target_id property is provided by the 'ValidReference'
- * validation constraint.
- *
- * @see \Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem::preSave()
- */
- class DataReferenceTargetDefinition extends DataDefinition {
- /**
- * {@inheritdoc}
- */
- public function getConstraints() {
- $constraints = parent::getConstraints();
- // If this data definition is marked as required for the sake of schema
- // definitions, we don't enforce it using the NotNull constraint. Instead
- // \Drupal\Core\Field\EntityReferenceItem is validated by the
- // 'ValidReference' constraint that operates at the field-item level. This
- // constraint takes into consideration that the target_id property can
- // be derived from the entity property.
- unset($constraints['NotNull']);
- return $constraints;
- }
- }
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