如何在yii2中计数和分组

I would like to generate following query using yii2:

SELECT COUNT(*) AS cnt FROM Lead WHERE allowed = 1 GROUP BY prompt_location_id,lead_type_id

我试过了:

$leadsCount = Lead::find()
->where('approved = 1')
->groupBy(['promoter_location_id', 'lead_type_id'])
->count();

生成此查询的内容:

SELECT COUNT(*) FROM (SELECT * FROM `lead` WHERE approved = 1 GROUP BY `promoter_location_id`, `lead_type_id`) `c`

在 yii 1.x 中，我会执行以下操作:

$criteria = new CDbCriteria();
$criteria->select = 'COUNT(*) AS cnt';
$criteria->group = array('promoter_location_id', 'lead_type_id');

$leadsCount = Lead::find()
->select(['COUNT(*) AS cnt'])
->where('approved = 1')
->groupBy(['promoter_location_id', 'lead_type_id'])
->all();