Issue #2099261 by JulienD, mr.baileys, amateescu: Fixed field_help() no longer lists field_type()/widget modules and can throw undefined index notice.

core/modules/field/field.module

@@ -120,25 +120,29 @@ function field_help($path, $arg) {
       $output .= '<dt>' . t('Enabling field types') . '</dt>';
       $output .= '<dd>' . t('The Field module provides the infrastructure for fields and field attachment; the field types and input widgets themselves are provided by additional modules. Some of the modules are required; the optional modules can be enabled from the <a href="@modules">Modules administration page</a>. Drupal core includes the following field type modules: Number (required), Text (required), List (required), Taxonomy (optional), Image (optional), and File (optional); the required Options module provides input widgets for other field modules. Additional fields and widgets may be provided by contributed modules, which you can find in the <a href="@contrib">contributed module section of Drupal.org</a>. Currently enabled field and input widget modules:', array('@modules' => url('admin/modules'), '@contrib' => 'http://drupal.org/project/modules', '@options' => url('admin/help/options')));
 
-      // Make a list of all widget and field modules currently enabled, in
-      // order by displayed module name (module names are not translated).
+      // Make a list of all widget and field modules currently enabled, ordered
+      // by displayed module name (module names are not translated).
       $items = array();
       $info = system_get_info('module');
-      $modules = array_merge(\Drupal::moduleHandler()->getImplementations('field_info'), \Drupal::moduleHandler()->getImplementations('field_widget_info'));
+      $field_widgets = \Drupal::service('plugin.manager.field.widget')->getDefinitions();
+      $field_types = \Drupal::service('plugin.manager.entity.field.field_type')->getDefinitions();
+      foreach (array_merge($field_types, $field_widgets) as $field_module) {
+        $modules[] = $field_module['provider'];
+      }
       $modules = array_unique($modules);
       sort($modules);
       foreach ($modules as $module) {
         $display = $info[$module]['name'];
         if (\Drupal::moduleHandler()->implementsHook($module, 'help')) {
-          $items['items'][] = l($display, 'admin/help/' . $module);
+          $items[] = l($display, 'admin/help/' . $module);
         }
         else {
-          $items['items'][] = $display;
+          $items[] = $display;
         }
       }
       $item_list = array(
         '#theme' => 'item_list',
-        '#items' => $items['items'],
+        '#items' => $items,
       );
       $output .= drupal_render($item_list);
       return $output;

core/modules/field/lib/Drupal/field/Tests/FieldHelpTest.php

@@ -0,0 +1,69 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\field\Tests\FieldHelpTest.
+ */
+
+namespace Drupal\field\Tests;
+
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Tests help display for the Field module.
+ */
+class FieldHelpTest extends WebTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array.
+   */
+  public static $modules = array('field', 'help');
+
+  // Tests field help implementation without optional core modules enabled.
+  protected $profile = 'minimal';
+
+  /**
+   * The admin user that will be created.
+   */
+  protected $adminUser;
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Field help functionality',
+      'description' => 'Verify help display for the Field module.',
+      'group' => 'Field',
+    );
+  }
+
+  public function setUp() {
+    parent::setUp();
+
+    // Create the admin user.
+    $this->adminUser = $this->drupalCreateUser(array('access administration pages', 'view the administration theme'));
+  }
+
+  /**
+   * Test the Field module's help page.
+   */
+  public function testFieldHelp() {
+    // Login the admin user.
+    $this->drupalLogin($this->adminUser);
+
+    // Visit the Help page and make sure no warnings or notices are thrown.
+    $this->drupalGet('admin/help/field');
+
+    // Enable the Options, Telephone and E-mail modules.
+    \Drupal::moduleHandler()->install(array('options', 'telephone', 'email'));
+    \Drupal::service('plugin.manager.field.widget')->clearCachedDefinitions();
+    \Drupal::service('plugin.manager.entity.field.field_type')->clearCachedDefinitions();
+
+    $this->drupalGet('admin/help/field');
+    $this->assertLink('Options', 0, 'Options module is listed on the Field help page.');
+    $this->assertLink('E-mail', 0, 'E-mail module is listed on the Field help page.');
+    $this->assertText('Telephone', 'Modules with field types that do not implement hook_help are listed.');
+    $this->assertNoLink('Telephone', 'Modules with field types that do not implement hook_help are not linked.');
+    $this->assertNoLink('Link', 'Modules that have not been installed, are not listed.');
+  }
+}