SQL查询到Rails查询

我的问题是

我用sql编写查询，如下所示：

SELECT sum(smsqs.count_sms) as nb_sms_sent,  count(smsq_receiveds.id) as nb_sms_received
FROM smsqs join smsq_receiveds on smsqs.id = smsq_receiveds.smsq_id
where smsq_receiveds.campaign = '436'

它工作得很好

在rails中，我有如下内容：

SmsqReceived.joins(:smsq).select('sum(smsqs.count_sms) as nb_sms_sent,  count(smsq_receiveds.id) as nb_sms_received').where(:smsq_receiveds=> {:campaign => '436'})

但我没有结果

结果是：

  SmsqReceived Load (0.2ms)  SELECT sum(smsqs.count_sms) as nb_sms_sent,  count(smsq_receiveds.id) as nb_sms_received FROM `smsq_receiveds` INNER JOIN `smsqs` ON `smsqs`.`id` = `smsq_receiveds`.`smsq_id` WHERE `smsq_receiveds`.`campaign` = 436
#<ActiveRecord::Relation [#<SmsqReceived id: nil>]>

在脚本sql上，它工作得很好

---

rails有什么问题？为什么rails的结果为零？

rails的性能与预期一样。SmsqReceived关系显示

id:nil

，因为查询没有选择id列

SmsqReceived Load (0.2ms)  SELECT sum(smsqs.count_sms) as nb_sms_sent,  count(smsq_receiveds.id) as nb_sms_received FROM `smsq_receiveds` INNER JOIN `smsqs` ON `smsqs`.`id` = `smsq_receiveds`.`smsq_id` WHERE `smsq_receiveds`.`campaign` = 436
#<ActiveRecord::Relation [#<SmsqReceived id: nil>]>

如果还需要所有SmsqReceived属性，请将它们包括在选择：

SmsqReceived.joins(:smsq).select('sms_receiveds.*, sum(smsqs.count_sms) as nb_sms_sent,  count(smsq_receiveds.id) as nb_sms_received').where(:smsq_receiveds=> {:campaign => '436'})

records = SmsqReceived.joins(:smsq).select('sum(smsqs.count_sms) as nb_sms_sent,  count(smsq_receiveds.id) as nb_sms_received').where(:smsq_receiveds=> {:campaign => '436'})
records.first.nb_sms_sent
records.first.nb_sms_received

SmsqReceived.joins(:smsq).select('sms_receiveds.*, sum(smsqs.count_sms) as nb_sms_sent,  count(smsq_receiveds.id) as nb_sms_received').where(:smsq_receiveds=> {:campaign => '436'})