yii2:mongodb aggregate子句返回内部服务器错误

我的数据库是mongodb。我使用以下查询和Yii2进行分组

$query->select([])
      ->from('networklog')
      ->aggregate([
          [
              '$group' => [
                  '_id' => '$userid', 'date' => [ '$max' => '$datetime' ]
              ]
          ],
          [ '$sort' => [ 'date'=>'1' ]],
       ]);

$rows = $query->all();

在mongodb中，我使用了以下查询，它可以正常工作

db.networklog.aggregate([
    { $group: { _id: "$userid", date: { $max: "$datetime" } } },
    { $sort: { date:1 } },
])

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如何在yii2中编写相同的查询以获得所需的结果？

yii2使用Mongo聚合的语法如下：

    $collection = Yii::$app->mongodb->getCollection('your_mongo_collection');

    $data = $collection->aggregate(
    [
        '$match' => [
            'name' => $name,
        ]
    ], [
        '$group' => [
            '_id' => '_id',
            'count' => [
                '$sum' => 1
            ]
        ]
    ]
);

---

Yi2使用Mongo聚合的语法如下：

    $collection = Yii::$app->mongodb->getCollection('your_mongo_collection');

    $data = $collection->aggregate(
    [
        '$match' => [
            'name' => $name,
        ]
    ], [
        '$group' => [
            '_id' => '_id',
            'count' => [
                '$sum' => 1
            ]
        ]
    ]
);