创建数据库通知表

php artisan notifications:table 执行数据库迁移 php artisan migrate

users表增加消息字段

php artisan make:migration add_notification_count_to_users_table --table=users
$table->integer('notification_count')->unsigned()->default(0) $table->dropColumn('notification_count');
php artisan migrate

生成通知类

$ php artisan make:notification TopicReplied 修改配置

<?php

    namespace App\Notifications;

    use App\Models\Reply;
    use Illuminate\Bus\Queueable;
    use Illuminate\Notifications\Notification;
    use Illuminate\Contracts\Queue\ShouldQueue;
    use Illuminate\Notifications\Messages\MailMessage;

    class TopicReplied extends Notification
    {
        use Queueable;

        public $reply;

        /**
         * Create a new notification instance.
         *
         * @return void
         */
        public function __construct(Reply $reply)
        {
            //
            $this->reply = $reply;
        }

        /**
         * Get the notification's delivery channels.
         *
         * @param mixed $notifiable
         * @return array
         */
        public function via($notifiable)
        {
            return ['database'];
        }

        public function toDatabase($notifiable)
        {
            $topic = $this->reply->topic;
            $link = $topic->link(['#reply' . $this->reply->id]);

            return [
                'reply_id' => $this->reply->id,
                'reply_content' => $this->reply->content,
                'user_id' => $this->reply->user->id,
                'user_name' => $this->reply->user->name,
                'user_avatar' => $this->reply->user->avatar,
                'topic_link' => $link,
                'topic_id' => $topic->id,
                'topic_title' => $topic->title,
            ];
        }

        /**
         * Get the mail representation of the notification.
         *
         * @param mixed $notifiable
         * @return \Illuminate\Notifications\Messages\MailMessage
         */
//    public function toMail($notifiable)
//    {
//        return (new MailMessage)
//                    ->line('The introduction to the notification.')
//                    ->action('Notification Action', url('/'))
//                    ->line('Thank you for using our application!');
//    }

        /**
         * Get the array representation of the notification.
         *
         * @param mixed $notifiable
         * @return array
         */
//    public function toArray($notifiable)
//    {
//        return [
//            //
//        ];
//    }
    }

触发通知

在观察器中

 public function created(Reply $reply)
    {
        $topic = $reply->topic;
       // $reply->topic->increment('reply_count', 1);
        $topic->user->notify(new TopicReplied($reply));
    }

重写模型Notifiable方法

class User extends Authenticatable
{
    use Notifiable {
        notify as protected laravelNotify;
    }
    public function notify($instance)
    {
        // 如果要通知的人是当前用户，就不必通知了！
        if ($this->id == Auth::id()) {
            return;
        }
        $this->increment('notification_count');
        $this->laravelNotify($instance);
    }

  .
  .
  .
}

生成通知控制器

$ php artisan make:controller NotificationsController