Rails按关联数据排序

Question

是否可以按教师的名字订购school.classrooms的结果？ 我想直接在关联中执行此操作，而不是单独调用。

class School < ActiveRecord::Base
  has_many :classrooms
end


class Classroom < ActiveRecord::Base
  belongs_to :school
  belongs_to :teacher
end


class Teacher < ActiveRecord::Base
  has_one :classroom
end

Answer 1

如果您使用rails 3.x，这应该可以工作

school.classrooms.includes(:teacher).order("teachers.name")