UserInfoModel.php

<?php

namespace App\Model;

use Illuminate\Database\Eloquent\Model;

class UserInfoModel extends Model
{
    protected $table='user_info';
    protected $primaryKey = 'userId';
    public $timestamps = false;

    public function department()
    {
        return $this->hasOne(DepartmentModel::class, 'department_id', 'department_id');
    }
}