我如何通过CakePHP中的“投票”订购?

我正在使用Cake
PHP进行CMS / Web服务来为iPhone应用程序供电.我想知道如何订购我的.find()方法,以便我可以通过一些外部模型的“计数”来订购?

例如:
视频对象与投票相关联.因此,单个视频行有多个投票行(带有user_id和video_id).

$videos = $this->Video->find('list', array( <<orderby stuff>> ));

如何更改orderby子句,以便通过投票返回25个最受欢迎的视频?

最佳答案 我们假设您有以下表格:

CREATE TABLE `videos` (
  `id` char(36) NOT NULL,
  `name` varchar(50) NOT NULL,
  PRIMARY KEY (`id`)
)

CREATE TABLE `votes` (
  `id` char(36) NOT NULL,
  `video_id` char(36) NOT NULL,
  `user_id` char(36) NOT NULL,
  PRIMARY KEY (`id`)
);

您尝试编写的SQL类似于:

    SELECT 
      count(id), 
      video_id 
   FROM votes 
   GROUP BY video_id 
   ORDER BY count(id) DESC 
   LIMIT 25;

问题是,它不会返回视频名称.这可以通过JOIN或使用蛋糕递归功能轻松解决.鉴于以上情况,我会写以下内容:

$this->Vote->recursive = 1;
$vote_info = $this->Vote->find('all', 
   array(
      'fields' => array('count(Vote.id)','Video.name'), 
      'group' => array('video_id'), 
      'order' => array('count(Vote.id) DESC'), 
      'limit' => 25, 
   )
);

当您获得数据时,只要模型中的关系设置正确,您还将获得视频信息(由于递归选项设置为1).

例如,数据看起来像:

Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [count(`Vote`.`id`)] => 3
                )
            [Video] => Array
                (
                    [name] => Dumb and Dumber
                )
        )
    [1] => Array
        (
            [0] => Array
                (
                    [count(`Vote`.`id`)] => 1
                )
            [Video] => Array
                (
                    [name] => Lord of the Rings
                )
        )
    [2] => Array
        (
            [0] => Array
                (
                    [count(`Vote`.`id`)] => 1
                )
            [Video] => Array
                (
                    [name] => Just Do It
                )
        )
)

我想您可以从这里看到如何访问视图中的数据.

Hoppy编码!

更新:
如果您只需要视频ID,则可以执行以下操作:

$this->Vote->recursive = 0;
$votes = $this->Vote->find('all', 
   array(
      'fields' => array('count(Vote.id) as count', 'Vote.video_id'), 
      'order' => array('count(Vote.id) DESC'),
      'group' => array('Vote.video_id'),
      'limit' => 25,
   )
);

这将返回:

Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [count] => 3
                )
            [Vote] => Array
                (
                    [video_id] => 4dac4de7-4f80-48c1-8a02-83b4dfa458e5
                )
        )
    [1] => Array
        (
            [0] => Array
                (
                    [count] => 1
                )
            [Vote] => Array
                (
                    [video_id] => 4dac4ddc-712c-4795-8d9a-83b4dfa458e5
                )
        )
    [2] => Array
        (
            [0] => Array
                (
                    [count] => 1
                )
            [Vote] => Array
                (
                    [video_id] => 4dac4df0-382c-4bb5-a5ee-83b4dfa458e5
                )
        )
)
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