Laravel技巧集锦（39）：实现notification已读和未读状态显示

原理：

在通知列表中，如果已读，直接链接到原本的url；如果未读，先跳转到notifications/n_id将此通知设置为已读，在链接到redirect_url（原本的url）。使用 notifications/n_id?redirect_url=xxx的形式

在laravel 5.3.30+ 中vendor\laravel\framework\src\Illuminate\Notifications\DatabaseNotification.php

有read、unread、markAsRead

<?php

namespace Illuminate\Notifications;

use Illuminate\Database\Eloquent\Model;

class DatabaseNotification extends Model
{
  
    public $incrementing = false;

  
    protected $table = 'notifications';

 
    protected $guarded = [];

  
    protected $casts = [
        'data' => 'array',
        'read_at' => 'datetime',
    ];

  
    public function notifiable()
    {
        return $this->morphTo();
    }

  
    public function markAsRead()
    {
        if (is_null($this->read_at)) {
            $this->forceFill(['read_at' => $this->freshTimestamp()])->save();
        }
    }


    public function read()
    {
        return $this->read_at !== null;
    }

    
    public function unread()
    {
        return $this->read_at === null;
    }

  
    public function newCollection(array $models = [])
    {
        return new DatabaseNotificationCollection($models);
    }
}

步骤：

1、列表显示

<li class="notifications {{$notification->unread() ? 'unread' : ''}}">
    <a
            @if($notification->unread())
            href="/notifications/{{$notification->id}}?redirect_url=/inbox/{{$notification->data['dialog']}}"

            @else
            href="/inbox/{{$notification->data['dialog']}}"
            @endif
    >{{$notification->data['name']}}
    给您发送了一条私信
    </a>
</li>

2、路由

Route::get('/notifications/{notification}','NotificationsController@show');

3、NotificationsController

 public function show(DatabaseNotification $notification)//注入
    {
        $notification->markAsRead(); //设置为已读
        return redirect(\Request::query('redirect_url'));
    }