gem groupdate问题与同一列的2个时区

Question

我使用的宝石阿霍伊跟踪访问和groupdate显示每天的统计数据.

要计算每日访问次数,我在Visit模型中使用此查询:

Visit.group_by_day(:started_at).order('started_at').count

它工作正常,直到最后一天18,我的时区从BRT(-03:00)变为BRST(-02:00).

现在,上面的查询返回018之后每天的访问次数:

2.1.3 :026 > puts Visit.group_by_day(:started_at).order('started_at desc').limit(10).count.to_yaml
   (0.3ms)  SELECT COUNT(*) AS count_all, DATE_ADD(CONVERT_TZ(DATE_FORMAT(CONVERT_TZ(DATE_SUB(started_at, INTERVAL 0 HOUR), '+00:00', 'America/Sao_Paulo'), '%Y-%m-%d 00:00:00'), 'America/Sao_Paulo', '+00:00'), INTERVAL 0 HOUR) AS day FROM `visits` WHERE (started_at IS NOT NULL) GROUP BY DATE_ADD(CONVERT_TZ(DATE_FORMAT(CONVERT_TZ(DATE_SUB(started_at, INTERVAL 0 HOUR), '+00:00', 'America/Sao_Paulo'), '%Y-%m-%d 00:00:00'), 'America/Sao_Paulo', '+00:00'), INTERVAL 0 HOUR) ORDER BY started_at desc LIMIT 10
---
2015-10-14 03:00:00.000000000 Z: 158
2015-10-15 03:00:00.000000000 Z: 127
2015-10-16 03:00:00.000000000 Z: 101
2015-10-17 03:00:00.000000000 Z: 112
2015-10-18 03:00:00.000000000 Z: 111
2015-10-19 03:00:00.000000000 Z: 0
2015-10-20 03:00:00.000000000 Z: 0
2015-10-21 03:00:00.000000000 Z: 0
2015-10-22 03:00:00.000000000 Z: 0

但是,如果我只选择过去5天(全部都在BRST时区),它的工作原理如下:

2.1.3 :027 > puts Visit.group_by_day(:started_at).order('started_at desc').limit(5).count.to_yaml
   (0.3ms)  SELECT COUNT(*) AS count_all, DATE_ADD(CONVERT_TZ(DATE_FORMAT(CONVERT_TZ(DATE_SUB(started_at, INTERVAL 0 HOUR), '+00:00', 'America/Sao_Paulo'), '%Y-%m-%d 00:00:00'), 'America/Sao_Paulo', '+00:00'), INTERVAL 0 HOUR) AS day FROM `visits` WHERE (started_at IS NOT NULL) GROUP BY DATE_ADD(CONVERT_TZ(DATE_FORMAT(CONVERT_TZ(DATE_SUB(started_at, INTERVAL 0 HOUR), '+00:00', 'America/Sao_Paulo'), '%Y-%m-%d 00:00:00'), 'America/Sao_Paulo', '+00:00'), INTERVAL 0 HOUR) ORDER BY started_at desc LIMIT 5
---
2015-10-19 02:00:00.000000000 Z: 85
2015-10-20 02:00:00.000000000 Z: 72
2015-10-21 02:00:00.000000000 Z: 84
2015-10-22 02:00:00.000000000 Z: 80
2015-10-23 02:00:00.000000000 Z: 21

我直接在mysql服务器上做了这两个查询,两者都返回了正确的结果.

即,当查询覆盖具有2个不同时区groupdate 的记录时,不能计算最后一个记录.

我想确保这是一个groupdate gem bug.或者我错过了什么？

Answer 1

我相信这是因为您正在将两个 Convert_tz 之间的 HH:mm:ss 归零

请更新“day”变量的 SELECT：

1. 删除 DATE_FORMAT
2. 将整个内容放入 DATE() AS 日期中

然后将 GROUP BY 值替换为：day - 或者您可以将上面的更改复制粘贴到 group by 中