CAKEPHP3.6：从表中统计不同的记录

我试图在具有where条件的表上实现不同的计数

这就是我尝试过的：

$customerServiceTypes = TableRegistry::get('CustomerServiceTypes');
$customers_count = $customerServiceTypes->find('all', array(
            'fields' => 'DISTINCT CustomerServiceType.customer_id',
            'conditions' => array("CustomerServiceTypes.service_type_id" => $id)))->count();

但它不起作用。我得到的结果是

25

，但应该是

2

<代码>独立不工作

$customerServiceTypes = TableRegistry::get('CustomerServiceTypes');
$customers_count = $customerServiceTypes->find()
     ->select(['customer_id'])
     ->distinct()
     ->where(['service_type_id =' => $id])->count();