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当用户登陆页面时，我会打电话：

@objects = Object.select("objects.*, MAX(votes.updated_at) AS 
               mv").joins(:votes).group("objects.id").
               order("mv DESC").includes(:categories)

这很好用。

但是，我有一个用于排序的 ajax 调用，当它调用完全相同的命令时，我遇到了一个错误，提示“mv 不是列”，这是查询：

SELECT COUNT(*) AS count_all, objects.id AS objects_id FROM "objects" 
       INNER JOIN "votes" ON "votes"."object_id" = "objects"."id" 
       GROUP BY objects.id ORDER BY mv DESC

为什么相同的命令完全忽略了 select 调用。它只用 count_all 和 objects_id 替换它？

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1 回答 1

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It might be because mv is not select for 'output' so do SELECT COUNT(*) AS count_all, mv, ...

于 2012-09-04T22:32:40.640 回答