From 76a31b39258fdccb89928abf0a595f09ea08f016 Mon Sep 17 00:00:00 2001
From: Marc Jauvin <marc.jauvin@gmail.com>
Date: Sat, 7 Dec 2024 09:54:04 -0500
Subject: [PATCH] make it work for relations using pivot table as well

---
 modules/backend/formwidgets/TagList.php | 23 +++++++++++++++++++----
 modules/backend/routes.php              |  7 +------
 modules/backend/widgets/Form.php        |  6 +++---
 3 files changed, 23 insertions(+), 13 deletions(-)

diff --git a/modules/backend/formwidgets/TagList.php b/modules/backend/formwidgets/TagList.php
index 6506e5907a..d9907e083d 100644
--- a/modules/backend/formwidgets/TagList.php
+++ b/modules/backend/formwidgets/TagList.php
@@ -4,6 +4,8 @@
 
 use Backend\Classes\FormWidgetBase;
 use Illuminate\Database\Eloquent\Relations\Relation as RelationBase;
+use Winter\Storm\Database\Relations\BelongsToMany;
+use Winter\Storm\Database\Relations\MorphToMany;
 
 /**
  * Tag List Form Widget
@@ -132,19 +134,32 @@ protected function hydrateRelationSaveValue($names): ?array
         $relation = $this->getRelationObject();
         $relationModel = $this->getRelationModel();
 
-        $existingTags = $relation->lists($this->nameFrom, $relationModel->getKeyName());
+        $keyName = $relationModel->getKeyName();
+        $pivot = in_array(get_class($relation), [BelongsToMany::class, MorphToMany::class]);
+
+        if ($pivot) {
+            $existingTags = $relationModel->whereIn($this->nameFrom, $names)->lists($this->nameFrom, $keyName);
+        } else {
+            $existingTags = $relation->lists($this->nameFrom, $keyName);
+        }
 
         $newTags = $this->customTags ? array_diff($names, $existingTags) : [];
         $deletedTags = $this->customTags ? array_diff($existingTags, $names) : [];
 
         foreach ($newTags as $newTag) {
-            $newModel = $relation->create([$this->nameFrom => $newTag]);
+            if ($pivot) {
+                $newModel = new $relationModel;
+                $newModel->{$this->nameFrom} = $newTag;
+                $newModel->save();
+            } else {
+                $newModel = $relation->create([$this->nameFrom => $newTag]);
+            }
             $existingTags[$newModel->getKey()] = $newTag;
         }
 
-        if ($deletedTags) {
+        if (!$pivot && $deletedTags) {
             $deletedKeys = array_keys($deletedTags);
-            $relation->whereIn($relationModel->getKeyName(), $deletedKeys)->delete();
+            $relation->whereIn($keyName, $deletedKeys)->delete();
             foreach ($deletedTags as $id) {
                 unset($existingTags[$id]);
             }
diff --git a/modules/backend/routes.php b/modules/backend/routes.php
index 7ca92974df..f4e670054d 100644
--- a/modules/backend/routes.php
+++ b/modules/backend/routes.php
@@ -20,7 +20,7 @@
     Event::fire('backend.beforeRoute');
 
     /*
-     * Other pages
+     * Route everything to `Backend\Classes\BackendController`, which itself acts as a router for the Backend.
      */
     Route::group([
         'middleware' => ['web'],
@@ -29,11 +29,6 @@
         Route::any('{slug?}', 'Backend\Classes\BackendController@run')->where('slug', '(.*)?');
     });
 
-    /*
-     * Entry point
-     */
-    Route::any(Config::get('cms.backendUri', 'backend'), 'Backend\Classes\BackendController@run')->middleware('web');
-
     /**
      * @event backend.route
      * Fires after backend routes have been added
diff --git a/modules/backend/widgets/Form.php b/modules/backend/widgets/Form.php
index 387b12eb67..7cbb8cb242 100644
--- a/modules/backend/widgets/Form.php
+++ b/modules/backend/widgets/Form.php
@@ -1228,10 +1228,10 @@ public function getSaveData(): array
             $fieldValue = $this->dataArrayGet($result, $parts, FormField::NO_SAVE_DATA);
             if ($fieldValue === FormField::NO_SAVE_DATA) {
                 if ($widget->getConfig('type') === 'taglist' && $widget->getConfig('mode') === 'relation') {
-                    // let the TagList remove its relation items
-                    $widget->getSaveValue(array());
+                    $fieldValue = [];
+                } else {
+                    continue;
                 }
-                continue;
             }
 
             // Exclude fields where the widget returns NO_SAVE_DATA