add puts when migrate

db/migrate/20190820102040_change_exercise_1930_position.rb

@@ -2,9 +2,10 @@ class ChangeExercise1930Position < ActiveRecord::Migration[5.2]
   def change
     exs = Exercise.all.includes(:exercise_questions)
     exs.each do |ex|
-      ex_questions = ex&.exercise_questions&.select(:id,:question_number,:exercise_id)&.order("question_number ASC")
+      ex_questions = ex&.exercise_questions&.select(:id,:question_number,:exercise_id)&.order("question_number ASC")  #试卷的位置迁移
       if ex_questions.exists?
         ex_questions.each_with_index do |q,index|
+          puts index
           q_num = index + 1
           if q.question_number.to_i != q_num
             q.update_attributes(question_number: q_num)
@@ -12,9 +13,10 @@ class ChangeExercise1930Position < ActiveRecord::Migration[5.2]
         end
       end
 
-      ex_q_bank = ex&.exercise_bank&.exercise_bank_questions&.select(:id,:question_number,:exercise_bank_id,:shixun_id)&.order("question_number ASC")
+      ex_q_bank = ex&.exercise_bank&.exercise_bank_questions&.select(:id,:question_number,:exercise_bank_id,:shixun_id)&.order("question_number ASC") #试卷的习题库位置迁移
       if ex_q_bank.exists?
         ex_q_bank.each_with_index do |q,index|
+          puts index
           q_num_1 = index + 1
           if q.question_number.to_i != q_num_1
             q.update_attributes(question_number: q_num_1)