jiqu-library-server/app/Models/UserVip.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class UserVip extends Model
{
    use HasFactory;

    public function vip()
    {
        return $this->belongsTo(Vip::class, 'vip_id');
    }
}