View file vendor/laravel/framework/src/Illuminate/Notifications/DatabaseNotificationCollection.php
<?php namespace Illuminate\Notifications; use Illuminate\Database\Eloquent\Collection; class DatabaseNotificationCollection extends Collection { /** * Mark all notifications as read. * * @return void */ public function markAsRead() { $this->each->markAsRead(); } /** * Mark all notifications as unread. * * @return void */ public function markAsUnread() { $this->each->markAsUnread(); } }