DataReferenceTargetDefinition.php

<?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;
    }

}