CakePHP 订单不起作用

Question

您好，我使用的是 CakePHP 版本 - 2.5.5。

我有一个表名chat_ategory_mages 我想按降序获得平均频率顺序数。了解频率请查看 - How to get Average hits between current date to posted date in MySQL?

chat_ategory_mages

id        chat_category_id    hits       created
------------------------------------------------
1         5                  10       2014-11-07 11:07:57
2         5                  8        2014-11-10 05:10:20
3         5                  70       2014-10-04 08:04:22

代码

$order=array('Frequency' => 'DESC');
$fields=array(
    'ChatCategoryImage.id',
    'ChatCategoryImage.chat_category_id',
    'ChatCategoryImage.created',
    'ChatCategoryImage.hits',
    'hits/(DATEDIFF(NOW(),created)) AS Frequency',
);

QUERY-1

$rndQry=$this->ChatCategoryImage->find('all',array('conditions'=>array('ChatCategoryImage.chat_category_id'=>$cetegory_id), 'fields'=>$fields, 'order'=>$order, 'limit'=>10));
pr($rndQry); //WORKING FINE

QUERY-2

//THIS IS NOT WORKING
$this->Paginator->settings = array(
        'conditions'=>array('ChatCategoryImage.chat_category_id'=>$cetegory_id),
        'fields'=>$fields,
        'limit' => 10,
        'order' => $order,
);
$getCategoryImages = $this->Paginator->paginate('ChatCategoryImage');
pr($getCategoryImages); //NOT WORKING

如果我编写简单的 cakephp 查询，上面的表格 order 工作正常，但是当我使用 cakephp 分页时它不起作用。如果我使用$order=array('hits' => 'DESC');，那么它非常完美。始终显示结果 70,10,8 但是当我添加 Frequency 时，结果不是降序排列。

Mysql 查询

QUERY-1：

SELECT ChatCategoryImage.id, ChatCategoryImage.chat_category_id, ChatCategoryImage.hits, ChatCategoryImage.created, hits/(DATEDIFF(NOW(),created)) AS 频率, FROM myshowcam.chat_category_images AS ChatCategoryImage WHERE ChatCategoryImage.chat_category_id = 5 ORDER BY Frequency DESC LIMIT 10

QUERY-2：

SELECT ChatCategoryImage.id, ChatCategoryImage.chat_category_id, ChatCategoryImage.hits, ChatCategoryImage.created, hits/(DATEDIFF(NOW(),created)) AS 频率, FROM myshowcam.chat_category_images AS ChatCategoryImage WHERE ChatCategoryImage.chat_category_id = 5 限制 10

问题是什么？为什么它没有在第二个查询中出现ORDER BY Frequency？

谢谢 中国

Answer 1

你的代码有点错误

    $this->paginate = array(
                   'conditions' => array('ChatCategoryImage.chat_category_id'=>$cetegory_id), 
                   'limit' => 10, 'order' => 'Frequency' => 'DESC');
    $getAllCourses = $this->paginate('ChatCategoryImage');

Answer 2

这发生在我身上。您必须将第三个参数 $whitelist 添加到分页函数中。例如。

$this->Paginator->settings = array(
        'conditions'=>array('ChatCategoryImage.chat_category_id'=>$cetegory_id),
        'fields'=>$fields,
        'limit' => 10,
        'order' => $order,
);
$scope =  array();
$whitelist = array('ChatCategoryImage.id', ...); //The fields you want to allow ordering.

$getCategoryImages = $this->Paginator->paginate('ChatCategoryImage', $scope, $whitelist);
pr($getCategoryImages);

我不知道为什么会这样。我试图查看分页函数中的代码，但我无法弄清楚。

Answer 3

你可以使用 virtualFields

$this->ChatCategoryImage->virtualFields = array('Frequency' => 'hits/(DATEDIFF(NOW(),created))');

改变订购方式

$order = array('Frequency' => 'desc');