# 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 = ""
    length = str.length
    unless str.nil?
      if length === 1
        result += (str.to_i + 64).chr
        return result
      elsif length > 1
        for i in 0...length
          result += (str[i].to_i + 64).chr
        end
        return result
      end
    end
    return result
  end

end