educoder/db/migrate/20190427045904_update_exercise_default_value.rb

class UpdateExerciseDefaultValue < ActiveRecord::Migration[5.2]
  def change
    ExerciseUser.where(objective_score: -1.0).update_all(objective_score: 0.0)
    # ExerciseUser.where(subjective_score: -1.0).update_all(subjective_score: 0.0)  #主观题默认分数为-1，不需修改
    # ExerciseAnswer.where(score: -1.0).update_all(score: 0.0)                     #6.10 修改，方便判断主观题是否
  end
end