trustieforge/app/helpers/exercise_helper.rb

# encoding: utf-8
module ExerciseHelper

  #判断用户是否已经提交了问卷
  def has_commit_exercise?(exercise_id, user_id)
    pu = ExerciseUser.find_by_excercise_id_and_user_id(exercise_id, user_id)
    if pu.nil?
      false
    else
      true
    end
  end

  def convert_to_char(str)
    result = ""
    if str.count >= 1
      for i in 0 .. str.count do i
        result += (str[i].to_i + 64).chr
      end
    end
  end

end