mysql - Yii 1.1 模型关系不能在选择时使用连接表列

Question

这是我的课

Class System extends CActiveRecord
{
    public function relations() {
        return array(
            'SystemInverterModuleMountGrouped' => array(self::HAS_MANY, 'SystemInverterModule', array('id' => 'system_inverter_id'),
                'through' => 'SystemInverter',
                'group' => 'system_id, SystemInverterModuleMountGrouped.mount_id',
                'condition' => 'SystemInverterModuleMountGrouped.mount_id is not null AND SystemInverterModuleMountGrouped.mount_id != "" AND number_of_mounts > 0 AND
                    CASE WHEN Mount.unit_of_measure = 1 THEN
                        SystemInverterModuleMountGrouped.existing_array != 1
                    ELSE true
                    END',
                'select' => '*, '
                    . 'SUM(SystemInverterModuleMountGrouped.number_of_mounts) AS number_of_mounts_grouped, ', 
                'with' => 'Mount'
            )
        );
    }
}

这工作正常，但现在我想在特定条件下对 number_of_mounts 进行求和

array(
    'select' => '*, '
        . 'IF(Mount.unit_of_measure IN (1,2,3), 0, SUM(SystemInverterModuleMountGrouped.number_of_mounts)) AS number_of_mounts_grouped, ',
)

它不起作用并且 yii 抛出错误

Active record “SystemInverterModule” is trying to select an invalid column “IF(Mount.unit_of_measure IN (1”. Note, the column must exist in the table or be an expression with alias.

请注意，我可以在条件下使用 Mount.unit_of_measure

'condition' => 'CASE WHEN Mount.unit_of_measure = 1 THEN '

它适用于原始 SQL 查询

SELECT IF(Mount.unit_of_measure IN (1,2,3), 0, SUM(SystemInverterModuleMountGrouped.number_of_mounts)) AS number_of_mounts_grouped
FROM `SystemInverterModules` `SystemInverterModuleMountGrouped`
LEFT OUTER JOIN `SystemInverter` `SystemInverter`
       ON (`SystemInverter`.`id` = `SystemInverterModuleMountGrouped`.`system_inverter_id`)
LEFT OUTER JOIN `Inventory` `Mount` 
       ON (`SystemInverterModuleMountGrouped`.`mount_id` = `Mount`.`id`)
WHERE (SystemInverterModuleMountGrouped.mount_id is not null AND SystemInverterModuleMountGrouped.mount_id != "" AND
       number_of_mounts > 0 AND
       CASE WHEN Mount.unit_of_measure = 1 THEN 
              SystemInverterModuleMountGrouped.existing_array != 1 
       ELSE true END
    )
    AND (`SystemInverter`.`system_id` = '42146')
GROUP BY system_id, SystemInverterModuleMountGrouped.mount_id
ORDER BY sort_mounting ASC

Answer 1

在这种情况下，您应该使用数组来声明 select - 字符串格式不适用于复杂的表达式:

'select' => [
    '*',
    'IF(Mount.unit_of_measure IN (1,2,3), 0, SUM(SystemInverterModuleMountGrouped.number_of_mounts)) AS number_of_mounts_grouped', 
],