php - CakePHP 虚拟字段是其他三个虚拟字段的总和？

Question

我在 CakePHP 中有一个虚拟字段，它需要是我的用户模型中三个非常不同的 SQL 查询的 SUM。我试图通过拥有一个由 3 个其他虚拟字段组成的虚拟字段来实现这一点。

var $virtualFields = array (
        'field_one' => 'select coalesce(sum(coalesce(t_a.field, 0)), 0)*10 as field_one from t_a join t_b on t_a.t_b_id = t_b.id where t_b.user_id=User.id',
        'field_two' =>  'select coalesce(sum(coalesce(t_c.field, 0)), 0)*2 as field_two from t_d left join (t_c) on (t_d.id=t_c.t_d_id) where t_d.user_id = User.id',
        'field_three' => 'select coalesce(sum(coalesce(value, 0)), 0) as field_three from t_e where user_id=User.id',
        'field_sum' => 'User.field_one+User.field_two+User.field_three'
    );

这行不通。当它到达“field_sum”时，我收到错误“field_one doesn't exist”。之前问过如何组合这三个sql语句，一直没有得到满意的回答。事实证明，简单地单独运行它们并在事后对它们求和要好得多，也容易得多。在 CakePHP 的上下文中有什么方法可以做到这一点吗？

编辑

这是 cake 生成的 SQL:

SELECT 
    /* Users fields */
    (select coalesce(sum(coalesce(t_a.field, 0)), 0)*10 as field_one from t_a join t_b on t_a.t_b_id = t_b.id where t_b.user_id=User.id) AS `User__field_one`, 
    (select coalesce(sum(coalesce(t_c.field, 0)), 0)*2 as field_two from t_d left join (t_c) on (t_d.id=t_c.t_d_id) where t_d.user_id = User.id) AS  `User__field_two`, 
    (select coalesce(sum(coalesce(value, 0)), 0) as bonus_reputation from reputation_bonuses where user_id=User.id) AS  `User__field_three`,        (`User`.`field_one`+`User`.`field_two`+`User`.`field_three`) AS  `field_sum`, 
    FROM `users` AS `User`   
    WHERE `User`.`email` = '/* redacted */' AND `User`.`password` = '/* redacted */'    LIMIT 1 

看到我尝试将定义更改为 (User__field_one+User__field_two+User__field_three) 以利用它们的命名方式。运气不好。

确切的错误是:SQL 错误:字段列表中的 1054 未知列 User.field_one。

Answer 1

只需删除别名:

'field_sum' => 'field_one + field_two + field_three'