NN2021040101/app/Models/UserGroup.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class UserGroup extends Model
{
    protected $table = 'love_user_group';
    protected $fillable = [
        'uid', 'gid'
    ];
    public function group(){
        return $this->hasOne(Group::class,'id','gid');
    }
}