cross data table

cross_data_table.rb

def build_courses
    subjects = %w{语文 数学 英语 物理 化学 生物 历史 地理 文综 理综}
    grades = {
      1 => "七年级",
      2 => "八年级",
      3 => "九年级",
      4 => "十年级"
    }
    terms = {
      1 => "2013-2014学年",
      2 => "2014-2015学年",
      3 => "2015-2016学年"
    }
    classes = %w{1班 2班 3班}
    header = %w{学年 所属年级 班级名称 老师}.concat(subjects)
    body = []
    bodies_rows = terms.size * grades.size * classes.size

    bodies_rows.times do |index|
      new_ary = []
      new_ary << terms.values[index/(grades.size*classes.size)]
      new_ary << grades.values[(index/(grades.size*classes.size)) == 0 ? (index/classes.size) : ((index/classes.size)-(index/(grades.size*classes.size))*grades.size) ]
      new_ary << classes[(index >= classes.size) ? index-(classes.size*(index/classes.size)) : index] 
      new_ary << ""
      subjects.each {|s| new_ary << ''}
      body << new_ary
    end

    p header
    p body
   
  end

build_courses