Laravel MongoDB hasMany的关系不起作用

Question

我试图在相册和照片之间建立一种关系(相册有很多照片)。下面是我的控制器和我的模型的样子。有趣的是，反向关系照片->相册(belongsTo)工作得很好！但是相册->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

这个问题与我的身份证是ObjectID有关，这似乎是耶森格斯拉勒维尔MongoDB司机的问题.我们实际上已经决定回到MariaDB，充分利用雄辩的/关系

Answer 2

我做了和你一样的事情，我发现Mongodb没有什么问题。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。因此，我在父模型的顶部声明了$primaryKey = "id“，做了一个小小的修改，它运行得很好

Answer 3

这对我有用。

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