我正在使用 cakephp 2.1,我想获得特定电影的平均电影评级。 其中“Movie”是一个模型,它包含“Language”和“CriticReview”作为模型。 数组结构如下。
array(
(int) 0 => array(
'Movie' => array(
'id' => '4',
'name' => 'Maattrraan',
'cover_image' => '/movies/4d0d1c41d956a2cb2ab93603d1fdf70c.jpg',
'release' => '2012-10-12',
'runtime' => '',
'budget' => '65 crore',
'box_office' => '',
'language_id' => '2',
'industry_id' => '3'
),
'Language' => array(
'id' => '2',
'name' => 'tamil'
),
'CriticReview' => array(
(int) 0 => array(
'rating' => '4',
'movie_id' => '4'
),
(int) 1 => array(
'rating' => '3',
'movie_id' => '4'
)
)
),
(int) 1 => array(
'Movie' => array(
'id' => '1',
'name' => 'Romeo',
'cover_image' => '/movies/32aa2788fa5e1584d4c627c56214574e.jpg',
'release' => '2012-07-06',
'runtime' => '',
'budget' => '',
'box_office' => '',
'language_id' => '1',
'industry_id' => '1'
),
'Language' => array(
'id' => '1',
'name' => 'kannada'
),
'CriticReview' => array(
(int) 0 => array(
'rating' => '6',
'movie_id' => '1'
),
(int) 1 => array(
'rating' => '3',
'movie_id' => '1'
)
)
));
所以我必须接受评论家的评论。请帮我找出解决方案。这项工作将是可观的。
最佳答案
我不知道您的查询现在是什么样子,但您可以尝试添加此字段:
$this->Movie->find("all", array(
"fields" => array("AVG(CriticReview.rating) AS AverageRating"),
"conditions" => ...
));
返回的数组现在将在每部电影中包含一个子数组,其键为 0
,如下所示
[0] => Array
(
[AverageRating] => AVG_CALCULATED_BY_MYSQL
)
我个人更喜欢保存计算数据而不是动态计算。也许您想阅读这个问题:MySQL - Calculating fields on the fly vs storing calculated data
关于CakePHP 2.1 用于查询的平均函数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13069353/