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

Modules/Page/Events/PageIsCreating.php

+<?php
+
+namespace Modules\Page\Events;
+
+use Modules\Core\Contracts\EntityIsChanging;
+
+class PageIsCreating 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;
+
+    public function __construct(array $attributes)
+    {
+        $this->attributes = $attributes;
+        $this->original = $attributes;
+    }
+
+    /**
+     * @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;
+    }
+}

Modules/Page/Repositories/Eloquent/EloquentPageRepository.php

@@ -4,6 +4,7 @@ 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\PageWasCreated;
 use Modules\Page\Events\PageWasDeleted;
 use Modules\Page\Events\PageWasUpdated;
@@ -38,7 +39,9 @@ class EloquentPageRepository extends EloquentBaseRepository implements PageRepos
         if (array_get($data, 'is_home') === '1') {
             $this->removeOtherHomepage();
         }
-        $page = $this->model->create($data);
+
+        event($event = new PageIsCreating($data));
+        $page = $this->model->create($event->getAttributes());
 
         event(new PageWasCreated($page->id, $data));
 

Modules/Page/Tests/PagesTest.php

@@ -3,6 +3,7 @@
 namespace Modules\Page\Tests;
 
 use Illuminate\Support\Facades\Event;
+use Modules\Page\Events\PageIsCreating;
 use Modules\Page\Events\PageWasCreated;
 use Modules\Page\Events\PageWasDeleted;
 use Modules\Page\Events\PageWasUpdated;
@@ -93,6 +94,30 @@ class PagesTest extends BasePageTest
         });
     }
 
+    /** @test */
+    public function it_triggers_an_event_when_page_is_creating()
+    {
+        Event::fake();
+
+        $page = $this->createPage();
+
+        Event::assertDispatched(PageIsCreating::class, function ($e) use ($page) {
+            return $e->getAttributes()['template'] === $page->template;
+        });
+    }
+
+    /** @test */
+    public function it_can_change_page_data_before_creating_page()
+    {
+        Event::listen(PageIsCreating::class, function (PageIsCreating $event) {
+            $event->setAttributes(['template' => 'better-tpl']);
+        });
+
+        $page = $this->createPage();
+
+        $this->assertEquals('better-tpl', $page->template);
+    }
+
     /** @test */
     public function it_triggers_event_when_page_was_updated()
     {
@@ -135,4 +160,17 @@ class PagesTest extends BasePageTest
             return $e->page->id === $page->id;
         });
     }
+
+    private function createPage()
+    {
+        return $this->page->create([
+            'is_home' => '1',
+            'template' => 'default',
+            'en' => [
+                'title' => 'My Other Page',
+                'slug' => 'my-other-page',
+                'body' => 'My Page Body',
+            ],
+        ]);
+    }
 }

Modules/Page/changelog.yml

 url: https://github.com/AsgardCms/Platform
 versions:
+    "2.5.0@unreleased":
+        added:
+            - Trigger event before a page is created (<code>PageIsCreating</code>) allow data to be changed
     "2.2.0":
         added:
             - Testing event trigger on page deletion