socialforge/app/models/student_work_test.rb

# encoding: utf-8
class StudentWorkTest < ActiveRecord::Base
  attr_accessible :student_work_id, :results, :status, :src
  belongs_to :student_work

  serialize :results, Array

  def status_to_s
    case self.status.to_i
      when -1
        '编译出错'
      when -2
        '答题错误'
      when -3
        '答案错误'
      when 1
        '运行出错'
      when 2
        '超时'
      when 3
        '内存超出'
      when 4
        '输出超出'
      when 5
        '禁用函数'
      when 6
        '其他错误'
      when 0
        '成功'
      else
        '未知错误'
    end
  end

  def test_score
    if self.status.to_i == 0
      100
    elsif self.results.empty?
      0
    else 
      get_success_count * 100 / self.results.count
    end
  end

  private
  def get_success_count
    self.results.inject(0) do |sum, result|
      sum += (result["status"].to_i == 0 ? 1 : 0)
    end || 0
  end

end