Issue #2578249 by yched: Some e_r fields get the wrong Selection handler

core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php

@@ -51,7 +51,7 @@ public static function defaultStorageSettings() {
    */
   public static function defaultFieldSettings() {
     return array(
-      'handler' => 'default:' . (\Drupal::moduleHandler()->moduleExists('node') ? 'node' : 'user'),
+      'handler' => 'default',
       'handler_settings' => array(),
     ) + parent::defaultFieldSettings();
   }

core/modules/entity_reference/entity_reference.module

@@ -11,8 +11,6 @@
 use Drupal\Core\Render\Element;
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\field\Entity\FieldConfig;
-use Drupal\field\FieldStorageConfigInterface;
-use Drupal\field\FieldConfigInterface;
 
 /**
  * Implements hook_help().
@@ -71,56 +69,6 @@ function entity_reference_field_widget_info_alter(&$info) {
   }
 }
 
-/**
- * Implements hook_ENTITY_TYPE_update() for 'field_storage_config'.
- *
- * Reset the instance handler settings, when the target type is changed.
- */
-function entity_reference_field_storage_config_update(FieldStorageConfigInterface $field_storage) {
-  if ($field_storage->getType() != 'entity_reference') {
-    // Only act on entity reference fields.
-    return;
-  }
-
-  if ($field_storage->isSyncing()) {
-    // Don't change anything during a configuration sync.
-    return;
-  }
-
-  if ($field_storage->getSetting('target_type') == $field_storage->original->getSetting('target_type')) {
-    // Target type didn't change.
-    return;
-  }
-
-  foreach ($field_storage->getBundles() as $bundle) {
-    $field = FieldConfig::loadByName($field_storage->getTargetEntityTypeId(), $bundle, $field_storage->getName());
-    $field->setSetting('handler_settings', []);
-    $field->save();
-  }
-}
-
-/**
- * Implements hook_ENTITY_TYPE_presave() for 'field_config'.
- *
- * Determine the selection handler plugin ID for an entity reference field.
- */
-function entity_reference_field_config_presave(FieldConfigInterface $field) {
-  if ($field->getType() != 'entity_reference') {
-    // Only act on entity reference fields.
-    return;
-  }
-
-  if ($field->isSyncing()) {
-    // Don't change anything during a configuration sync.
-    return;
-  }
-
-  $target_type = $field->getFieldStorageDefinition()->getSetting('target_type');
-  $selection_manager = \Drupal::service('plugin.manager.entity_reference_selection');
-  list($current_handler) = explode(':', $field->getSetting('handler'), 2);
-  $field->setSetting('handler', $selection_manager->getPluginId($target_type, $current_handler));
-}
-
 /**
  * Implements hook_form_FORM_ID_alter() for 'field_ui_field_storage_add_form'.
  */

core/modules/field/field.module

@@ -8,10 +8,12 @@
 use Drupal\Core\Entity\EntityTypeInterface;
 use Drupal\Core\Entity\DynamicallyFieldableEntityStorageInterface;
 use Drupal\field\Entity\FieldConfig;
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\field\FieldConfigInterface;
+use Drupal\field\FieldStorageConfigInterface;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\Core\Url;
-use Drupal\field\Entity\FieldStorageConfig;
 
 /*
  * Load all public Field API functions. Drupal currently has no
@@ -280,3 +282,65 @@ function field_form_config_admin_import_form_alter(&$form, FormStateInterface $f
     }
   }
 }
+
+/**
+ * Implements hook_ENTITY_TYPE_update() for 'field_storage_config'.
+ *
+ * Reset the field handler settings, when the storage target_type is changed on
+ * an entity reference field.
+ */
+function field_field_storage_config_update(FieldStorageConfigInterface $field_storage) {
+  if ($field_storage->isSyncing()) {
+    // Don't change anything during a configuration sync.
+    return;
+  }
+
+  // Act on all sub-types of the entity_reference field type.
+  /** @var \Drupal\Core\Field\FieldTypePluginManager $field_type_manager */
+  $field_type_manager = \Drupal::service('plugin.manager.field.field_type');
+  $item_class = 'Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem';
+  $class = $field_type_manager->getPluginClass($field_storage->getType());
+  if ($class !== $item_class && !is_subclass_of($class, $item_class)) {
+    return;
+  }
+
+  // If target_type changed, reset the handler in the fields using that storage.
+  if ($field_storage->getSetting('target_type') !== $field_storage->original->getSetting('target_type')) {
+    foreach ($field_storage->getBundles() as $bundle) {
+      $field = FieldConfig::loadByName($field_storage->getTargetEntityTypeId(), $bundle, $field_storage->getName());
+      // Reset the handler settings. This triggers field_field_config_presave(),
+      // which will take care of reassigning the handler to the correct
+      // derivative for the new target_type.
+      $field->setSetting('handler_settings', []);
+      $field->save();
+    }
+  }
+}
+
+/**
+ * Implements hook_ENTITY_TYPE_presave() for 'field_config'.
+ *
+ * Determine the selection handler plugin ID for an entity reference field.
+ */
+function field_field_config_presave(FieldConfigInterface $field) {
+  // Don't change anything during a configuration sync.
+  if ($field->isSyncing()) {
+    return;
+  }
+
+  // Act on all sub-types of the entity_reference field type.
+  /** @var \Drupal\Core\Field\FieldTypePluginManager $field_type_manager */
+  $field_type_manager = \Drupal::service('plugin.manager.field.field_type');
+  $item_class = 'Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem';
+  $class = $field_type_manager->getPluginClass($field->getType());
+  if ($class !== $item_class && !is_subclass_of($class, $item_class)) {
+    return;
+  }
+
+  // Make sure the selection handler plugin is the correct derivative for the
+  // target entity type.
+  $target_type = $field->getFieldStorageDefinition()->getSetting('target_type');
+  $selection_manager = \Drupal::service('plugin.manager.entity_reference_selection');
+  list($current_handler) = explode(':', $field->getSetting('handler'), 2);
+  $field->setSetting('handler', $selection_manager->getPluginId($target_type, $current_handler));
+}

core/modules/field/field.post_update.php

@@ -2,10 +2,11 @@
 
 /**
  * @file
- * Post update functions for Field.
+ * Post update functions for Field module.
  */
 
 use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\field\Entity\FieldConfig;
 
 /**
  * @addtogroup updates-8.0.0-beta
@@ -23,6 +24,23 @@ function field_post_update_save_custom_storage_property() {
   return t('All field storage configuration objects re-saved.');
 }
 
+/**
+ * Fixes the 'handler' setting for entity reference fields.
+ */
+function field_post_update_entity_reference_handler_setting() {
+  foreach (FieldConfig::loadMultiple() as $field_config) {
+    $field_type_manager = \Drupal::service('plugin.manager.field.field_type');
+    $item_class = 'Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem';
+    $class = $field_type_manager->getPluginClass($field_config->getType());
+    if ($class === $item_class || is_subclass_of($class, $item_class)) {
+      // field_field_config_presave() will fix the 'handler' setting on save.
+      $field_config->save();
+    }
+  }
+
+  return t('Selection handler for entity reference fields have been adjusted.');
+}
+
 /**
  * @} End of "addtogroup updates-8.0.0-beta".
  */

core/modules/field/src/Tests/EntityReference/EntityReferenceItemTest.php

@@ -303,20 +303,34 @@ public function testSelectionHandlerSettings() {
     $field_storage->save();
 
     // Do not specify any value for the 'handler' setting in order to verify
-    // that the default value is properly used.
+    // that the default handler with the correct derivative is used.
     $field = FieldConfig::create(array(
       'field_storage' => $field_storage,
       'bundle' => 'entity_test',
     ));
     $field->save();
+    $field = FieldConfig::load($field->id());
+    $this->assertEqual($field->getSetting('handler'), 'default:entity_test');
 
+    // Change the target_type in the field storage, and check that the handler
+    // was correctly reassigned in the field.
+    $field_storage->setSetting('target_type', 'entity_test_rev');
+    $field_storage->save();
     $field = FieldConfig::load($field->id());
-    $this->assertTrue($field->getSetting('handler') == 'default:entity_test');
+    $this->assertEqual($field->getSetting('handler'), 'default:entity_test_rev');
 
+    // Change the handler to another, non-derivative plugin.
     $field->setSetting('handler', 'views');
     $field->save();
     $field = FieldConfig::load($field->id());
-    $this->assertTrue($field->getSetting('handler') == 'views');
+    $this->assertEqual($field->getSetting('handler'), 'views');
+
+    // Change the target_type in the field storage again, and check that the
+    // non-derivative handler was unchanged.
+    $field_storage->setSetting('target_type', 'entity_test_rev');
+    $field_storage->save();
+    $field = FieldConfig::load($field->id());
+    $this->assertEqual($field->getSetting('handler'), 'views');
   }
 
   /**

core/modules/field/src/Tests/Migrate/d6/MigrateFieldInstanceTest.php

@@ -79,9 +79,7 @@ public function testFieldInstanceSettings() {
       'display_field' => FALSE,
       'display_default' => FALSE,
       'uri_scheme' => 'public',
-      // This value should be 'default:file' but the test does not migrate field
-      // storages so we end up with the default value for this setting.
-      'handler' => 'default:node',
+      'handler' => 'default:file',
       'handler_settings' => array(),
     );
     $field_settings = $field->getSettings();

core/modules/field/src/Tests/Update/EntityReferenceHandlerSettingUpdateTest.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\field\Tests\Update\EntityReferenceHandlerSettingUpdateTest.
+ */
+
+namespace Drupal\field\Tests\Update;
+
+use Drupal\system\Tests\Update\UpdatePathTestBase;
+
+/**
+ * Tests the update for the entity reference 'handler' setting.
+ *
+ * @group field
+ */
+class EntityReferenceHandlerSettingUpdateTest extends UpdatePathTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setDatabaseDumpFiles() {
+    $this->databaseDumpFiles = [
+      __DIR__ . '/../../../../system/tests/fixtures/update/drupal-8.bare.standard.php.gz',
+    ];
+  }
+
+  /**
+   * Tests field_post_update_entity_reference_handler_setting().
+   *
+   * @see field_post_update_entity_reference_handler_setting()
+   */
+  public function testFieldPostUpdateERHandlerSetting() {
+    $configFactory = $this->container->get('config.factory');
+
+    // Load the 'node.article.field_image' field config, and check that its
+    // 'handler' setting is wrong.
+    /** @var \Drupal\Core\Config\Config */
+    $config = $configFactory->get('field.field.node.article.field_image');
+    $settings = $config->get('settings');
+    $this->assertEqual($settings['handler'], 'default:node');
+
+    // Run updates.
+    $this->runUpdates();
+
+    // Reload the config, and check that the 'handler' setting has been fixed.
+    $config = $configFactory->get('field.field.node.article.field_image');
+    $settings = $config->get('settings');
+    $this->assertEqual($settings['handler'], 'default:file');
+  }
+
+}

core/modules/file/src/Tests/FileItemTest.php

@@ -10,6 +10,7 @@
 use Drupal\Core\Field\FieldItemInterface;
 use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\Core\Field\FieldStorageDefinitionInterface;
+use Drupal\field\Entity\FieldConfig;
 use Drupal\field\Tests\FieldUnitTestBase;
 
 /**
@@ -70,6 +71,12 @@ protected function setUp() {
    * Tests using entity fields of the file field type.
    */
   public function testFileItem() {
+    // Check that the selection handler was automatically assigned to
+    // 'default:file'.
+    $field_definition = FieldConfig::load('entity_test.entity_test.file_test');
+    $handler_id = $field_definition->getSetting('handler');
+    $this->assertEqual($handler_id, 'default:file');
+
     // Create a test entity with the
     $entity = entity_create('entity_test');
     $entity->file_test->target_id = $this->file->id();

core/modules/node/src/Entity/Node.php

@@ -402,7 +402,6 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setDescription(t('The username of the content author.'))
       ->setRevisionable(TRUE)
       ->setSetting('target_type', 'user')
-      ->setSetting('handler', 'default')
       ->setDefaultValueCallback('Drupal\node\Entity\Node::getCurrentUserId')
       ->setTranslatable(TRUE)
       ->setDisplayOptions('view', array(

core/modules/system/src/Tests/Update/UpdatePostUpdateTest.php

@@ -62,6 +62,7 @@ public function testPostUpdate() {
     $updates = array_merge([
       'block_post_update_disable_blocks_with_missing_contexts',
       'field_post_update_save_custom_storage_property',
+      'field_post_update_entity_reference_handler_setting',
       'system_post_update_fix_enforced_dependencies',
       'views_post_update_update_cacheability_metadata',
     ], $updates);

core/profiles/standard/config/install/field.field.node.article.field_image.yml

@@ -32,6 +32,6 @@ settings:
     title: ''
     width: null
     height: null
-  handler: 'default:node'
+  handler: 'default:file'
   handler_settings: {  }
 field_type: image

core/profiles/standard/config/install/field.field.user.user.user_picture.yml

@@ -32,6 +32,6 @@ settings:
     height: null
   alt_field_required: false
   title_field_required: false
-  handler: 'default:node'
+  handler: 'default:file'
   handler_settings: {  }
 field_type: image