在原则1中从LEFT JOIN到leftJoin（）-如何正确执行？

Question

I have two tables, request and request_reply , here is the LEFT JOIN query that selects requests along with the numbers of replies:

SELECT request.id, COUNT(request_reply.id) as replies
FROM request LEFT JOIN request_reply ON request.id = request_reply.request_id
GROUP BY `request`.`id`
ORDER BY replies ASC

But when I am trying to write it as a Doctrine query:

$query = Doctrine_Query::create()
         ->select('Request.id, COUNT(RequestReply.id) as reply_count')
         ->from('Request')
         ->leftJoin('RequestReply ON Request.id = RequestReply.request_id')
         ->groupBy('Request.id')
         ->orderBy('reply_count ASC, Request.id DESC');

It comes out as without LEFT JOIN :

SELECT `r`.`id` AS `r__id`, COUNT(`r2`.`id`) AS `r2__0` 
FROM `request` `r`, `request_reply` `r2`
GROUP BY `r`.`id`
ORDER BY `r2__0` ASC, `r`.`id` DESC

I don't understand what is wrong, I have tried everything, but there is no JOIN in the resulting query no matter what I do. And this is a legacy project with Doctrine 1, so I can't update to Doctrine 2.

Update

Mappings.

Request.php

$this->hasMany('RequestReply as Replies', array('local' => 'id', 'foreign' => 'request_id'));

RequestReply.php

$this->hasOne('Request', array('local' => 'request_id', 'foreign' => 'id'));

Answer 1

have you mapped your entities correctly? I'd imagine that in your Entity Request you have a OneToMany annotation or anything else (YAML..) that points to the Entity RequestReply. If so, you should be able to achieve what you are looking for just doing this:

$query = Doctrine_Query::create()
         ->select('Request.id, COUNT(rp.id) as reply_count')
         ->from('Request r')
         ->leftJoin('r.RequestReply rp')
         ->groupBy('r.id')
         ->orderBy('reply_count ASC, r.id DESC');

Let'me know if you got it working. Any doubt with the association mapping you can find here

[EDIT]

Nick, Try again please. The first error was because I didn't know you had use a Alias Replies. Sorted out. The second error is gonna be gone with the field r.id in the SELECT. ;-)

$query = Doctrine_Query::create()
         ->select('r.id, COUNT(rp.id) as reply_count')
         ->from('Request r')
         ->leftJoin('r.Replies rp')
         ->groupBy('r.id')
         ->orderBy('reply_count ASC, r.id DESC');