admin/app/Models/System/SysConfig.php

<?php

namespace App\Models\System;

use Illuminate\Database\Eloquent\Model;

class SysConfig extends Model
{
	protected $connection = 'mysql';

    protected $table = 'sys_config';

    protected $primaryKey  = 'rid';

    public $timestamps = false;

    protected $guarded = [];

    public function getConfigValAttribute($val)
    {
        return json_decode($val);
    }
}