sipadu_mbip/app/Model/UserDetail.php

<?php

namespace App\Model;

use Jenssegers\Mongodb\Eloquent\Model as Eloquent;
use Jenssegers\Mongodb\Eloquent\SoftDeletes;
use Jenssegers\Mongodb\Eloquent\SoftDeletes;

class UserDetail extends Eloquent {
    //
    use SoftDeletes;

	protected $connection = 'mongodb';
    protected $collection = 'user_detail';
	
	protected $guarded = ['_id'];

	public function user() {
        return $this->belongsTo('App\Model\User','_id','_id');
    }
}