Fix TagList formwidget

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
@@ -125,29 +127,44 @@ public function getSaveValue($value)
      */
     protected function hydrateRelationSaveValue($names): ?array
     {
-        if (!$names) {
-            return $names;
-        }
-
         if (!is_array($names)) {
             $names = [$names];
         }
 
+        $relation = $this->getRelationObject();
         $relationModel = $this->getRelationModel();
-        $existingTags = $relationModel
-            ->whereIn($this->nameFrom, $names)
-            ->lists($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 = new $relationModel;
-            $newModel->{$this->nameFrom} = $newTag;
-            $newModel->save();
+            if ($pivot) {
+                $newModel = new $relationModel;
+                $newModel->{$this->nameFrom} = $newTag;
+                $newModel->save();
+            } else {
+                $newModel = $relation->create([$this->nameFrom => $newTag]);
+            }
             $existingTags[$newModel->getKey()] = $newTag;
         }
 
+        if (!$pivot && $deletedTags) {
+            $deletedKeys = array_keys($deletedTags);
+            $relation->whereIn($keyName, $deletedKeys)->delete();
+            foreach ($deletedTags as $id) {
+                unset($existingTags[$id]);
+            }
+        }
+
         return array_keys($existingTags);
     }
 

modules/backend/widgets/Form.php

@@ -1227,7 +1227,11 @@ public function getSaveData(): array
             // Exclude fields that didn't provide any value
             $fieldValue = $this->dataArrayGet($result, $parts, FormField::NO_SAVE_DATA);
             if ($fieldValue === FormField::NO_SAVE_DATA) {
-                continue;
+                if ($widget->getConfig('type') === 'taglist') {
+                    $fieldValue = in_array($widget->getConfig('mode'), ['array','relation']) ? [] : '';
+                } else {
+                    continue;
+                }
             }
 
             // Exclude fields where the widget returns NO_SAVE_DATA