enabled flag_lists, started flags front ui

web/modules/custom/materio_flag/materio_flag.info.yml

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+name: Materio FLAG
+type: module
+description: Defines api behaviours for flaglist.
+core: 8.x
+package: Materio
+dependencies:
+  - drupal:flag_lists

web/modules/custom/materio_flag/materio_flag.module

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+<?php

web/modules/custom/materio_flag/materio_flag.permissions.yml

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+materio_jsonapi roles:
+  title: 'view role info'
+  description: 'View any role info in jsonapi.'
+  restrict access: true
+
+materio_jsonapi ownroles:
+  title: 'view own role info'
+  description: 'View own role info in jsonapi.'
+  restrict access: true

web/modules/custom/materio_flag/materio_flag.routing.yml

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+materio_flag.user_flagging_collections:
+  path: 'materio_flag/user_flagging_collections'
+  defaults:
+    _controller: '\Drupal\materio_flag\Controller\MaterioFlagController::getUsersFlaggingCollections'
+    _title: 'User Flagging Colleciton'
+  requirements:
+    _permission: 'access content'

web/modules/custom/materio_flag/src/Controller/MaterioFlagController.php

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+<?php
+
+namespace Drupal\materio_flag\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+// use Drupal\Core\Entity\EntityManagerInterface;
+// use Drupal\language\ConfigurableLanguageManagerInterface;
+// use Drupal\Core\Render\RendererInterface;
+// use Drupal\Core\Entity\EntityTypeManagerInterface;
+// use Drupal\Core\Cache\CacheableJsonResponse;
+// use Drupal\Core\Cache\CacheableMetadata;
+use Symfony\Component\HttpFoundation\JsonResponse;
+// use Drupal\Core\Url;
+// use Drupal\core\render\RenderContext;
+use Drupal\flag_lists\FlagListsService;
+
+/**
+ * Class AjaxHomeController.
+ */
+class MaterioFlagController extends ControllerBase {
+
+  /**
+   * Drupal\Core\Entity\EntityManagerInterface definition.
+   *
+   * @var \Drupal\Core\Entity\EntityManagerInterface
+   */
+  // protected $entityManager;
+  /**
+   * Drupal\language\ConfigurableLanguageManagerInterface definition.
+   *
+   * @var \Drupal\language\ConfigurableLanguageManagerInterface
+   */
+  // protected $languageManager;
+  /**
+   * Drupal\Core\Render\RendererInterface definition.
+   *
+   * @var \Drupal\Core\Render\RendererInterface
+   */
+  // protected $renderer;
+  /**
+   * Drupal\Core\Render\RendererInterface definition.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  // protected $entityTypeManager;
+
+  /**
+   * Drupal\Core\Render\RendererInterface definition.
+   *
+   * @var \Drupal\flag_lists\FlagListsService
+   */
+  protected $flaglists;
+
+  /**
+   * Constructs a new AjaxHomeController object.
+   */
+  // public function __construct(EntityManagerInterface $entity_manager, ConfigurableLanguageManagerInterface $language_manager, RendererInterface $renderer, EntityTypeManagerInterface $entity_type_manager) {
+  //   $this->entityManager = $entity_manager;
+  //   $this->languageManager = $language_manager;
+  //   $this->renderer = $renderer;
+  //   $this->entityTypeManager = $entity_type_manager;
+  // }
+  public function __construct(FlagListsService $flag_lists_service ) {
+   $this->flaglists = $flag_lists_service;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('flaglists'),
+    );
+  }
+
+  /**
+   * Hello.
+   *
+   * @return string
+   *   Return Hello string.
+   */
+  public function getUsersFlaggingCollections() {
+
+    // $data['data'] = ['test', 'hello'];
+
+    // $data['data'] = $this->flaglists->getUsersFlaggingCollections();
+
+    // $data['#cache'] = [
+    //   // 'max-age' => \Drupal\Core\Cache\Cache::PERMANENT,
+    //   'tags' => ['materio-flag-cache'],
+    //   // 'contexts' => [
+    //   //   'languages:language_content'
+    //   // ]
+    // ];
+    // $response = new CacheableJsonResponse($data);
+    // $response->addCacheableDependency(CacheableMetadata::createFromRenderArray($data));
+    // return $response;
+
+    $colls = $this->flaglists->getUsersFlaggingCollections();
+
+    $data = [];
+    foreach ($colls as $id => $collection) {
+      $data[] = array(
+        "id" => $id,
+        "name" => $collection->getName()
+      );
+    }
+
+    return new JsonResponse($data);
+  }
+
+}