Mysql 从Rails 4.1的`关系#计数'中删除不推荐的`:distinct`选项

代码：

SQL查询

checkin_scope.count(:select => "user_id", :distinct => true)

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我需要删除：distinct=>true，因为它已在Rails 4.1中删除

好的，我可以解决这个问题

SELECT COUNT(DISTINCT `checkins`.`user_id`) AS count_user_id, 
         location_id AS location_id 
FROM `checkins` INNER JOIN `locations` ON `locations`.`id` = `checkins`.`location_id` 
WHERE `checkins`.`business_id` = 452 AND `checkins`.`status` = 'loyalty' 
    AND `locations`.`status` = 'approved' AND 
   `checkins`.`location_id` IN (302825, 302838, 302839, 302901) 
    AND (date(checkins.created_at) between '2014-10-11' and '2014-11-11') 
GROUP BY location_id

其中checkin_scope是一种方法

checkin_scope.count("DISTINCT(checkins.user_id)")

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如果现在移除它会发生什么？只是curious@CaffeineCoder删除它不会产生不同的输出。将unique选项移动到一个作用域块中，在这里阅读更多关于它的内容。我想您已经读到，在Rails 4中，他们删除了deprecated:distinct option from Relation#count。您是否尝试过在指定关系的地方使用uniq？

def checkin_scope
  cscope = @business.checkins.loyalty_punchh.joins(:location).where(:locations => {:status => "approved"}).group(:location_id)
  cscope = cscope.for_location(@location) if @location
  if @from && @to
    cscope = cscope.where("date(checkins.created_at) between ? and ?",@from.to_date,@to.to_date)
  end
  cscope
end