complete Complete User Request Submission section RAD-1

app/Observers/DocumentObserver.php

@@ -0,0 +1,22 @@
+<?php
+namespace App\Observers;
+
+use App\Models\Document;
+use App\Services\Document\DocumentCodeService;
+
+class DocumentObserver
+{
+    protected DocumentCodeService $service;
+
+    public function __construct(DocumentCodeService $service)
+    {
+        $this->service = $service;
+    }
+
+    public function creating(Document $document): void
+    {
+        if (empty($document->code)) {
+            $document->code = $this->service->generate();
+        }
+    }
+}