liwo/app/Channels/DBChannel.php

<?php


namespace App\Channels;

use Illuminate\Notifications\Channels\DatabaseChannel;
use Illuminate\Notifications\Notification;

class DBChannel extends DatabaseChannel
{

    /**
     * Get the data for the notification.
     *
     * @param  mixed  $notifiable
     * @param  \Illuminate\Notifications\Notification  $notification
     * @return array
     *
     * @throws \RuntimeException
     */
    protected function getOptionalData($notifiable, Notification $notification)
    {
        if (method_exists($notification, 'toDatabaseOptional')) {
            return is_array($data = $notification->toDatabaseOptional($notifiable))
                ? $data : [$data];
        }
    }

    /**
     * Build an array payload for the DatabaseNotification Model.
     *
     * @param  mixed  $notifiable
     * @param  \Illuminate\Notifications\Notification  $notification
     * @return array
     */
    protected function buildPayload($notifiable, Notification $notification)
    {
        return [
            'id' => $notification->id,
            'type' => get_class($notification),
            'data' => $this->getData($notifiable, $notification),
            'read_at' => null,
        ] + $this->getOptionalData($notifiable, $notification);
    }
}