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[yaffs-website] / web / core / lib / Drupal / Core / TypedData / DataReferenceTargetDefinition.php

diff --git a/web/core/lib/Drupal/Core/TypedData/DataReferenceTargetDefinition.php b/web/core/lib/Drupal/Core/TypedData/DataReferenceTargetDefinition.php
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+++ b/web/core/lib/Drupal/Core/TypedData/DataReferenceTargetDefinition.php
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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;
+  }
+
+}