Use new Model extender

extensions/tags/extend.php

@@ -8,12 +8,14 @@
  */
 
 use Flarum\Api\Event\Serializing;
+use Flarum\Discussion\Discussion;
 use Flarum\Discussion\Event\Saving;
 use Flarum\Extend;
 use Flarum\Tags\Access;
 use Flarum\Tags\Api\Controller;
 use Flarum\Tags\Content;
 use Flarum\Tags\Listener;
+use Flarum\Tags\Tag;
 use Illuminate\Contracts\Events\Dispatcher;
 use Illuminate\Contracts\View\Factory;
 
@@ -35,6 +37,9 @@ return [
         ->patch('/tags/{id}', 'tags.update', Controller\UpdateTagController::class)
         ->delete('/tags/{id}', 'tags.delete', Controller\DeleteTagController::class),
 
+    (new Extend\Model(Discussion::class))
+        ->belongsToMany('tags', Tag::class, 'discussion_tag'),
+
     function (Dispatcher $events, Factory $view) {
         $events->subscribe(Listener\AddDiscussionTagsRelationship::class);
 

extensions/tags/src/Listener/AddDiscussionTagsRelationship.php

@@ -13,10 +13,7 @@ use Flarum\Api\Controller;
 use Flarum\Api\Event\Serializing;
 use Flarum\Api\Event\WillGetData;
 use Flarum\Api\Serializer\DiscussionSerializer;
-use Flarum\Discussion\Discussion;
 use Flarum\Event\GetApiRelationship;
-use Flarum\Event\GetModelRelationship;
-use Flarum\Tags\Tag;
 use Illuminate\Contracts\Events\Dispatcher;
 
 class AddDiscussionTagsRelationship
@@ -26,23 +23,11 @@ class AddDiscussionTagsRelationship
      */
     public function subscribe(Dispatcher $events)
     {
-        $events->listen(GetModelRelationship::class, [$this, 'getModelRelationship']);
         $events->listen(GetApiRelationship::class, [$this, 'getApiRelationship']);
         $events->listen(WillGetData::class, [$this, 'includeTagsRelationship']);
         $events->listen(Serializing::class, [$this, 'prepareApiAttributes']);
     }
 
-    /**
-     * @param GetModelRelationship $event
-     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany|null
-     */
-    public function getModelRelationship(GetModelRelationship $event)
-    {
-        if ($event->isRelationship(Discussion::class, 'tags')) {
-            return $event->model->belongsToMany(Tag::class, 'discussion_tag', null, null, null, null, 'tags');
-        }
-    }
-
     /**
      * @param GetApiRelationship $event
      * @return \Tobscure\JsonApi\Relationship|null