public static function boot()
 {
     parent::boot();
     static::created(function ($department_head) {
         $department_head->notifications()->create(['sent_to' => Employee::find($department_head->employee_id)->user->id, 'sent_by' => auth()->user()->id, 'subject' => 'New designation', 'message' => trans('notification.department_head-created', ['department' => $department_head->department->name, 'name' => auth()->user()->employee->fullName()]), 'icon' => 'institution', 'color' => 'warning']);
     });
 }
 public function notifications()
 {
     $notifications = auth()->user()->notifications()->unread()->get();
     $user_notifications = collect();
     foreach ($notifications as $notification) {
         $user_notifications->push(['subject' => $notification->subject, 'message' => $notification->message, 'object_type' => $notification->object_type, 'object_id' => value(function () use($notification) {
             if ($notification->object_type == 'employee') {
                 return Employee::find($notification->object_id)->user->username;
             } else {
                 return $notification->object_id;
             }
         }), 'created_at' => $notification->created_at]);
     }
     return $user_notifications;
 }