Fix no user name shown just after upload file

com_dpattachments/admin/src/Controller/AttachmentController.php

@@ -40,9 +40,14 @@ public function upload(): void
 		try {
 			$model->upload($data);
 
+			$item = $model->getItem($model->getState($model->getName() . '.id'));
+			// if no "created_by_alias" is stored in DB, we need to load creator user info (name and email) to avoid showing user id
+			if( $item->created_by_alias == "" ){
+				$item = (object) \array_merge((array)$item, $model->getAuthor($item->created_by));
+			}
 			$content = $this->app->bootComponent('dpattachments')->renderLayout(
 				'attachment.render',
-				['attachment' => $model->getItem($model->getState($model->getName() . '.id'))]
+				['attachment' => $item]
 			);
 			$returnData['html'] = '<div>' . $content . '</div>';
 

com_dpattachments/admin/src/Model/AttachmentModel.php

@@ -17,11 +17,15 @@
 use Joomla\CMS\Language\Text;
 use Joomla\CMS\MVC\Model\AdminModel;
 use Joomla\CMS\Plugin\PluginHelper;
+use Joomla\CMS\User\UserFactoryAwareInterface;
+use Joomla\CMS\User\UserFactoryAwareTrait;
 use Joomla\Filesystem\File;
 use Joomla\Utilities\ArrayHelper;
 
-class AttachmentModel extends AdminModel
+class AttachmentModel extends AdminModel implements UserFactoryAwareInterface
 {
+	use UserFactoryAwareTrait;
+
 	protected $text_prefix = 'COM_DPATTACHMENTS';
 
 	/**
@@ -227,4 +231,15 @@ public function delete(&$pks)
 
 		return $success;
 	}
+
+	public function getAuthor(int $userId): array {
+		$userInfo = array();
+		$user = $this->getUserFactory()->loadUserById($userId);
+		// "loadUserById" always returns a "User" object, even if no user found, no need to check for null
+		$userInfo['author_id'] = $user->id;
+		$userInfo['author_name'] = $user->name;
+		$userInfo['author_email'] = $user->email;
+
+		return $userInfo;
+	}
 }