Ruby on rails 根据memeber'；年代

我有一个具有属性

：age

的模型

用户

，还有一个具有多个：：用户的模型

团队

我想知道，如果团队的年龄相同或不同，我如何创建两个作用域：相同年龄和不同年龄来筛选团队

Team.same_ages
# In all teams returned, all members have the same age

Team.different_ages
# In all teams returned, there is at least one member with
# different age as the others

---

我怎样才能做到这一点呢？

我只是觉得范围会是这样的：

scope :same_ages, -> {
   where("id IN (SELECT team_id
                 FROM users
                 GROUP BY team_id 
                 HAVING COUNT(DISTINCT(age)) = 1)"
}

scope :different_ages, -> {
   where("id IN (SELECT team_id
                 FROM users
                 GROUP BY team_id 
                 HAVING COUNT(DISTINCT(age)) > 1)"
}