changes

app/Containers/Dashboard/Actions/Pages/AttachPageToSubSectionAction.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Containers\Dashboard\Actions\Pages;
+
+use App\Containers\AppStructure\Models\Page;
+use App\Containers\AppStructure\Models\SubSection;
+
+class AttachPageToSubSectionAction
+{
+    public function run(Page $page, SubSection $subSection): Page
+    {
+        // Pessimistic lock to prevent race conditions
+        $page = Page::lockForUpdate()->findOrFail($page->id);
+
+        if ($page->sub_section_id !== null) {
+            throw new \InvalidArgumentException('Страница уже принадлежит другому подразделу');
+        }
+
+        $page->section()->associate($subSection);
+        $page->save();
+
+        return $page;
+    }
+}