新建关卡的问题

app/controllers/stages_controller.rb

@@ -18,7 +18,7 @@ class StagesController < ApplicationController
         @stage.position = @subject.stages.count + 1
         @stage.save!
         unless params[:shixun_id].blank?
-          shixuns = Shixun.where(id: params[:shixun_id])
+          shixuns = Shixun.where(id: params[:shixun_id]).order("field(id, #{params[:shixun_id].join(",")})")
           shixuns.each do |shixun|
             StageShixun.create!(stage_id: @stage.id, subject_id: @subject.id, shixun_id: shixun.id, position: @stage.stage_shixuns.count + 1)
           end