Add page observer to really block deletion of page used in menu item

Author: sten

README.md

@@ -403,10 +403,8 @@ check:
 - Seppe: menu components ok?
 
 menu:
-- page delete modal when page used in menu
-  - orm listeners for linkable models that are in a menu to avoid accidental deletion.
 - caching tree model + observer to clear cache
-- Menu titels
+- Menu titels menu items
 - Ben: add menu to default page template
 - test global search and improve table search and ordering
 

src/Models/Page.php

@@ -2,12 +2,14 @@
 
 namespace Statikbe\FilamentFlexibleContentBlockPages\Models;
 
+use Illuminate\Database\Eloquent\Attributes\ObservedBy;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Spatie\MediaLibrary\HasMedia;
 use Statikbe\FilamentFlexibleContentBlockPages\Facades\FilamentFlexibleContentBlockPages;
 use Statikbe\FilamentFlexibleContentBlockPages\Models\Concerns\HasTitleMenuLabelTrait;
 use Statikbe\FilamentFlexibleContentBlockPages\Models\Contracts\HasMenuLabel;
+use Statikbe\FilamentFlexibleContentBlockPages\Observers\PageObserver;
 use Statikbe\FilamentFlexibleContentBlocks\Models\Concerns\HasAuthorAttributeTrait;
 use Statikbe\FilamentFlexibleContentBlocks\Models\Concerns\HasCodeTrait;
 use Statikbe\FilamentFlexibleContentBlocks\Models\Concerns\HasDefaultContentBlocksTrait;
@@ -34,6 +36,7 @@
 /**
  * @property bool $is_undeletable
  */
+#[ObservedBy(PageObserver::class)]
 class Page extends Model implements HasCode, HasContentBlocks, HasHeroCallToActionsAttribute, HasHeroImageAttributes, HasIntroAttribute, HasMedia, HasMediaAttributes, HasMenuLabel, HasOverviewAttributes, HasPageAttributes, HasParent, HasSEOAttributes
 {
     use HasAuthorAttributeTrait;

src/Observers/PageObserver.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Statikbe\FilamentFlexibleContentBlockPages\Observers;
+
+use Statikbe\FilamentFlexibleContentBlockPages\Models\Page;
+
+class PageObserver
+{
+    /**
+     * Checks if the page is used in a menu item and blocks deletion.
+     */
+    public function deleting(Page $page): bool
+    {
+        if ($page->menuItem) {
+            return false;
+        }
+
+        return true;
+    }
+}