Laravel MongoDB hasMany 关系不起作用

Question

我正在尝试在相册和照片之间建立关系（一个相册有很多照片）。 下面是我的 controller 和我的模型的样子。 有趣的是，反向关系 photo->album (belongsTo) 工作正常。 但是专辑->照片返回一个空集合

## The hasMany relationship does NOT work... I get an empty collection
<?php
class AlbumController extends BaseController
{
    public function show(Request $request, $album_id)
    {
        $album = Album::find($album_id);
        dd($album->photos);
    }
}

## Results:
# Collection {#418
#  items: []
# }


## The belgonsTo relationship works
<?php
class PhotoController extends BaseController
{
    public function show(Request $request, $photo_id)
    {
        $photo = Photo::find($photo_id);
        dd($photo->album);
    }
}

<?php

namespace App;

use DB;
use Jenssegers\Mongodb\Eloquent\SoftDeletes;
use Moloquent;

class Album extends Moloquent
{
    use RecordActivity, SoftDeletes;

    protected $connection = 'mongodb';
    protected $table = 'albums';
    protected $collection = 'albums';
    protected $primaryKey = "_id";
    protected $dates = ['deleted_at'];
    protected $fillable = ['user_id','name','is_private'];

    public function photos()
    {
        // Neither seems to work
        //return $this->embedsMany('Photo');
        return $this->hasMany('App\Photo');
    }
}

<?php

namespace App;

use DB;
use Jenssegers\Mongodb\Eloquent\SoftDeletes;
use Moloquent;

class Photo extends Moloquent
{
    use RecordActivity, SoftDeletes;

    protected $connection = 'mongodb';
    protected $table = 'photos';
    protected $collection = 'photos';
    protected $primaryKey = "_id";
    protected $dates = ['deleted_at'];
    protected $fillable = ['album_id', 'user_id', 'name', 'folder', 'is_private', 'caption'];
    protected $hidden = [];

    // user and album belongsTo works 
    public function user()
    {
        return $this->belongsTo('App\User');
    }

    public function album()
    {
        return $this->belongsTo('App\Album');
    }
}

Answer 1

这个问题与我的 ID 是 ObjectID 的事实有关，它似乎是 Jessengers Laravel MongoDB 驱动程序的问题......我们实际上已经决定回到 Z7F9733E208088B1CE6DF3D4BE1765396 充分利用 Elo

Answer 2

我做了和你一样的事情，我发现 Mongodb 没有问题。 因为 Mongodb 将“_id”定义为主键，这就是它无法获得正确关系的原因：belongsTo 和 hasMany。 所以我做了一个小改动，在父 Model 的顶部声明了 $primaryKey = "id" 并且效果很好

Answer 3

这对我有用。

 /**
 * @return HasMany
 */
public function tasks(): HasMany
{
    return $this->hasMany(ProjectTask::class, 'project_id', 'idAsString');
}