weixin/app/Repositories/Models/Base/Banner.php

<?php

namespace App\Repositories\Models\Base;

use App\Repositories\Models\Model;

class Banner extends Model
{
    /**
     * @var string
     */
    protected $table = 'base_banners';

    protected $guarded = [];

    /**
     * The attributes excluded from the model's JSON form.
     *
     * @var array
     */
    protected $hidden = [];

    public function getUrlAttribute()
    {
        if (array_key_exists('path', $this->attributes)) return path_to_url($this->attributes['path']);
        return '';
    }
}