file/app/Documents/FingerPrintDocument.php

<?php

namespace App\Documents;

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

class FingerPrintDocument extends Model
{
    use  HasFactory, BaseDocument;

    protected $connection = 'mongodb';

    protected $fillable = ['user_id', 'agent', 'ip', 'os', 'city', 'country', 'token', 'expires_at'];


    public function user()
    {
        return $this->belongsTo(UserDocument::class, 'user_id', '_id');
    }
}