Cakephp 3：如何在 queryBuilder 中为关联数据添加顺序？答案

【问题标题】：Cakephp 3 : How to add order in queryBuilder for associative data?Cakephp 3：如何在 queryBuilder 中为关联数据添加顺序？
【发布时间】：2015-11-30 15:16:04
【问题描述】：

这里我有一个带有密码的事件字段。我需要按 download_count DESC 排序所有密码。所以我尝试了下面的代码。它没有给我任何错误，但 desc 不起作用。

 $event = $this->Events->get($id, [
                  'contain' => [
                      'EventPasswordAll.Passwords' => [
                          'queryBuilder' => function (Query $q) {
                              return $q->order(['download_count' => 'DESC']);
                          }
                      ]
                  ]
             ]);

我也试过了

 return $q->order(['Passwords.download_count' => 'DESC']);

我得到了查询

SELECT EventPasswordAll.id AS `EventPasswordAll__id`, EventPasswordAll.event_id AS `EventPasswordAll__event_id`, EventPasswordAll.password_id AS `EventPasswordAll__password_id`, Passwords.id AS `Passwords__id`, Passwords.name AS `Passwords__name`, Passwords.collection_id AS `Passwords__collection_id`, Passwords.photo_count AS `Passwords__photo_count`, Passwords.download_count AS `Passwords__download_count`, Passwords.created AS `Passwords__created`, Passwords.expires_at AS `Passwords__expires_at`, Passwords.recommended AS `Passwords__recommended`, Passwords.accepted AS `Passwords__accepted`, Passwords.user_id AS `Passwords__user_id` FROM event_password_all EventPasswordAll INNER JOIN passwords Passwords ON Passwords.id = (EventPasswordAll.password_id) WHERE EventPasswordAll.event_id in (14)

如何在 queryBuilder 中为关联数据添加顺序？

【问题讨论】：

生成的查询是什么样的？
我已经编辑了我的问题@ndm。
看起来Passwords 与EventPasswordAll 关联为EventPasswordAll belongsTo Passwords？

标签： cakephp cakephp-3.0 query-builder

【解决方案1】：

使用EventPasswordAll belongsTo Passwords 的关联，passwords 表记录将通过连接检索，如查询中所示。在这种情况下，没有对 Passwords 的查询，因此不会调用查询生成器。

您必须改为设置 EventPasswordAll 查询构建器的顺序，例如

$event = $this->Events->get($id, [
    'contain' => [
        'EventPasswordAll' => [
            'queryBuilder' => function (Query $q) {
                return $q->order(['Passwords.download_count' => 'DESC']);
            },
            'Passwords'
        ]
    ]
]);

【讨论】：