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educoder/db/migrate/20190820102040_change_exerc...

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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") #试卷的位置迁移
if ex_questions.present?
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)
end
end
end
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.present?
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)
end
end
end
end
end
end