POC for https://github.com/laravel/framework/discussions/31778

src/Eloquent/CustomRelations/HasCleverRelationships.php

@@ -397,6 +397,27 @@ public function __construct(
                     $relationName
                 );
             }
+
+            /**
+             * @inheritdoc
+             */
+            protected function migratePivotAttributes(Model $model): array
+            {
+                $values = [];
+
+                foreach (\array_keys($model->getAttributes(true)) as $key) {
+                    // To get the pivots attributes we will just take any of the attributes which
+                    // begin with "pivot_" and add those to this arrays, as well as unsetting
+                    // them from the parent's models since they exist in a different table.
+                    if (str_starts_with($key, 'pivot_')) {
+                        $values[substr($key, 6)] = $model->getAttributeFromArray($key);
+
+                        unset($model->$key);
+                    }
+                }
+
+                return $values;
+            }
         };
     }
 

src/Http/Controllers/ResourceControllerTrait.php

@@ -155,13 +155,21 @@ public function update(string $identifier, Request $request): JsonResponse
             $all = $request->all();
 
             try {
-                $model = $this->resourceService->get($identifier, appendIndex: false);
-                $model->fill(GeneralHelper::filterDataByKeys($all, \array_diff(
+                $toFill = GeneralHelper::filterDataByKeys($all, \array_diff(
                     $this->resourceService->getModelColumns(),
                     $this->resourceService->getIgnoreExternalUpdateFor()
-                )));
+                ));
+
+                if ($toFill === []) {
+                    return GeneralHelper::app(JsonResponse::class, [
+                        'data' => $this->resourceService->get($identifier)->toArray(),
+                        'status' => 200
+                    ]);
+                }
+
+                $model = $this->resourceService->get($identifier, appendIndex: false)->fill($toFill);
                 /** $request can contain also files so, overwrite this function to handle them */
-                $request->forceReplace($model->getDirty());
+                $request->forceReplace($model->getDirty(\array_keys($toFill)));
 
                 return GeneralHelper::app(JsonResponse::class, [
                     'data' => $this->resourceService->update($identifier, $this->validateUpdateRequest($request))