Trigger an event before a page is updated allowing data to be changed

Modules/Page/Events/PageIsUpdating.php

+<?php
+
+namespace Modules\Page\Events;
+
+use Modules\Core\Contracts\EntityIsChanging;
+use Modules\Page\Entities\Page;
+
+class PageIsUpdating implements EntityIsChanging
+{
+    /**
+     * Contains the attributes which can be changed by other listeners
+     * @var array
+     */
+    private $attributes;
+    /**
+     * Contains the original attributes which cannot be changed
+     * @var array
+     */
+    private $original;
+    /**
+     * @var Page
+     */
+    private $page;
+
+    public function __construct(Page $page, array $attributes)
+    {
+        $this->attributes = $attributes;
+        $this->original = $attributes;
+        $this->page = $page;
+    }
+
+    /**
+     * @return array
+     */
+    public function getAttributes()
+    {
+        return $this->attributes;
+    }
+
+    /**
+     * @param array $attributes
+     */
+    public function setAttributes(array $attributes)
+    {
+        $this->attributes = array_merge($this->attributes, $attributes);
+    }
+
+    /**
+     * @return array
+     */
+    public function getOriginal()
+    {
+        return $this->original;
+    }
+
+    /**
+     * @return Page
+     */
+    public function getPage()
+    {
+        return $this->page;
+    }
+}

Modules/Page/Repositories/Eloquent/EloquentPageRepository.php

@@ -5,6 +5,7 @@ namespace Modules\Page\Repositories\Eloquent;
 use Illuminate\Database\Eloquent\Builder;
 use Modules\Core\Repositories\Eloquent\EloquentBaseRepository;
 use Modules\Page\Events\PageIsCreating;
+use Modules\Page\Events\PageIsUpdating;
 use Modules\Page\Events\PageWasCreated;
 use Modules\Page\Events\PageWasDeleted;
 use Modules\Page\Events\PageWasUpdated;
@@ -60,7 +61,9 @@ class EloquentPageRepository extends EloquentBaseRepository implements PageRepos
         if (array_get($data, 'is_home') === '1') {
             $this->removeOtherHomepage($model->id);
         }
-        $model->update($data);
+
+        event($event = new PageIsUpdating($model, $data));
+        $model->update($event->getAttributes());
 
         event(new PageWasUpdated($model->id, $data));
 

Modules/Page/Tests/PagesTest.php

@@ -4,6 +4,7 @@ namespace Modules\Page\Tests;
 
 use Illuminate\Support\Facades\Event;
 use Modules\Page\Events\PageIsCreating;
+use Modules\Page\Events\PageIsUpdating;
 use Modules\Page\Events\PageWasCreated;
 use Modules\Page\Events\PageWasDeleted;
 use Modules\Page\Events\PageWasUpdated;
@@ -118,6 +119,33 @@ class PagesTest extends BasePageTest
         $this->assertEquals('better-tpl', $page->template);
     }
 
+    /** @test */
+    public function it_triggers_an_event_when_page_is_updating()
+    {
+        Event::fake();
+        $page = $this->createPage();
+
+        $this->page->update($page, ['en' => ['title' => 'Better!']]);
+
+        Event::assertDispatched(PageIsUpdating::class, function ($e) use ($page) {
+            return $e->getPage()->id === $page->id;
+        });
+    }
+
+    /** @test */
+    public function it_can_change_page_data_before_updating_page()
+    {
+        Event::listen(PageIsUpdating::class, function (PageIsUpdating $event) {
+            $event->setAttributes(['template' => 'better-tpl']);
+        });
+
+        $page = $this->createPage();
+        $this->page->update($page, ['template' => 'my-template', 'en' => ['title' => 'Better!']]);
+
+        $this->assertEquals('better-tpl', $page->template);
+    }
+
+
     /** @test */
     public function it_triggers_event_when_page_was_updated()
     {

Modules/Page/changelog.yml

@@ -3,6 +3,7 @@ versions:
     "2.5.0@unreleased":
         added:
             - Trigger event before a page is created (<code>PageIsCreating</code>) allow data to be changed
+            - Trigger event before a page is updated (<code>PageIsUpdating</code>) allow data to be changed
     "2.2.0":
         added:
             - Testing event trigger on page deletion