cakephp3-无法显示值的计数

我试图显示房间中的用户数量。但当我尝试这样做时，我会出错

这就是关系

Rooms has many users.
Rooms belong to groups.

public function initialize(array $config)
{
    parent::initialize($config);

    $this->table('rooms');
    $this->displayField('name');
    $this->primaryKey('id');

    $this->belongsTo('Groups', [
        'foreignKey' => 'group_id'
    ]);
    $this->hasMany('Users', [
        'foreignKey' => 'room_id'
    ]);
}

为了实现这一点，我编写了一个控制器函数，如下所示：

public function index()
{
   $this->loadComponent('Prg');
   $this->Prg->commonProcess();
   $params = $this->Prg->parsedParams();
   $this->paginate = [
    'limit'  => 25,
    'order' => ['id' => 'ASC'], 
    'finder' => ['RoomsList' =>['filter'=> $params]],
    'sortWhitelist' => ['Rooms.id','Rooms.name'],
    'extraOptions' =>['params' => $params]
    ];

   $rooms = $this->paginate($this->Rooms);
   $this->set(compact('rooms'));
   $this->set('_serialize', ['rooms']);
}

public function findRoomsList(Query $query, array $options)
{ 
    $query->select(['id','name','modified','created'])
    ->contain([
                    'Groups'=> function ($query) {
                        return $query->select(['id','name']);
                    },
                    'Users' => function($query){
                        return $query->select(['status','full_name']);
                        //want to fetch total number of users
                    }
            ]);

    echo $query;
    return $query;
}

此功能可为可用房间列表分页。这很好，但是现在当我试图显示每个房间中的用户数时，它抛出了错误

我修改了我的模型函数，如下所示：

public function index()
{
   $this->loadComponent('Prg');
   $this->Prg->commonProcess();
   $params = $this->Prg->parsedParams();
   $this->paginate = [
    'limit'  => 25,
    'order' => ['id' => 'ASC'], 
    'finder' => ['RoomsList' =>['filter'=> $params]],
    'sortWhitelist' => ['Rooms.id','Rooms.name'],
    'extraOptions' =>['params' => $params]
    ];

   $rooms = $this->paginate($this->Rooms);
   $this->set(compact('rooms'));
   $this->set('_serialize', ['rooms']);
}

public function findRoomsList(Query $query, array $options)
{ 
    $query->select(['id','name','modified','created'])
    ->contain([
                    'Groups'=> function ($query) {
                        return $query->select(['id','name']);
                    },
                    'Users' => function($query){
                        return $query->select(['status','full_name']);
                        //want to fetch total number of users
                    }
            ]);

    echo $query;
    return $query;
}

现在我得到了这个错误：

You are required to select the "Users.room_id" field(s) 

---

有人能告诉我我在这里犯的错误吗？我是CakePHP3新手。

您是否尝试过在用户容器中选择的字段列表中包含房间id？