Laravel 嵌套跨数据库关系

Question

为什么设置连接在嵌套关系中不起作用？

Follower.php

class Follower extends Model {
    $connection = 'followers';

    public function details() {
      return $this->belongsTo(User::class, 'user_id');
    } 
} 

User.php

class User extends Model {
    $connection = 'users';

    protected $withCount = ['notifications'];

    public function notifications() {
        return $this->setConnection('followers')->hasMany('App\Models\Notifications');
    }
}

和查询：

Follower::query()->where('user_id', 1)->with('details')->get();

它抛出：

SQLSTATE[42S02]：未找到基表或视图：1146 表 'users.notifications' 不存在（SQL: select ` ....

但是当我尝试这个时效果很好

User::with('notifications')->find(1);

更新 Notification.php

class Notification extends Model
{
    protected $fillable = [
        'user_id',
        'builder',
        'notification_type',
        'comment_id',
        'read_at'
    ];
}

Answer 1

这是自 2018 年以来 laravel 的一个已知问题，有关更多信息，请参阅此 thread，还有一个 open pull request 来解决此问题，并将在下一个版本之前得到修复

现在你可以使用hoyvoy/laravel-cross-database-subqueries 包

使用这个安装包

composer require hoyvoy/laravel-cross-database-subqueries

Follower.php

use Hoyvoy\CrossDatabase\Eloquent\Model;

class Follower extends Model {
    $connection = 'followers';

    public function details() {
      return $this->belongsTo(User::class, 'user_id');
    } 
} 

用户.php

use Hoyvoy\CrossDatabase\Eloquent\Model;

class User extends Model {
    $connection = 'users';

    protected $withCount = ['notifications'];

    public function notifications() {
        return $this->setConnection('followers')->hasMany('App\Models\Notifications');
    }
}

为您拥有的每个模型添加默认的protected $connection