如何以cakephp-3方式重写查询？

Question

原始sql查询：

SELECT Post.id, 
       Post.title, 
       Post.mark 
FROM   posts AS Post 
       INNER JOIN (SELECT post_id, 
                          Count(post_id) AS cnt 
                   FROM   comments 
                   WHERE  mark = 1 
                   GROUP  BY post_id) AS d 
               ON Post.id = d.post_id 
ORDER  BY d.cnt DESC 

我试图用cakephp-3方式编写这个原始sql查询。

我已经用cakephp-3方式进行了内部选择查询：

$comments = TableRegistry::get('Comments');
$query = $comments->find();
$query->select(['post_id','cnt'=>$query->func()->count('post_id')])
        ->where(['mark'=>1])
        ->group(['post_id']);

如何为这个内部查询设置别名？然后，如何使用“Posts”进行内部连接，或者如何获得“Posts”表的实例--如何与内部sql查询(派生的注释表)进行内部连接？

提前谢谢。如有任何答复，将不胜感激。

Answer 1

join的别名是这样创建的：

$query->innerJoin(['the_alias' => $subquery], $onConditions);

就你而言：

$comments = TableRegistry::get('Comments');
$subquery = $comments->find();
$subquery->select(['post_id' => 'post_id','cnt' => $query->func()->count('post_id')])
    ->where(['mark'=>1])
    ->group(['post_id']);

$postsTable->find()
    ->innerJoin(['d' => $subquery], ['Posts.id = d.post_id'])
    ->order(['d.cnt' => 'DESC']);