Ruby on Rails查询帮助

Question

我目前有以下查询

User.sum(:experience, :group => "clan", :conditions => ["created_at >= ? and created_at <= ?", "2010-02-15", "2010-02-16"])

我想返回经验最多的50个氏族，从经验最多的到经验最少的，返回经验最多的50个。 我将如何修改查询以实现该结果。 我知道我需要：limit => 50来限制查询，但是如果我添加：order =>“ clan DESC”，我会得到错误列“ users.experience”必须出现在GROUP BY子句中或用于聚合功能

Answer 1

您需要在order子句中重复计算

User.sum(:experience, :group => "clan", :order=> "sum(experience) DESC", :limit => 50, :conditions => ["created_at >= ? and created_at <= ?", "2010-02-15", "2010-02-16"])