#学生提交作品表
class StudentWork < ActiveRecord::Base
  attr_accessible :name, :description, :homework_common_id, :user_id, :final_score, :teacher_score, :student_score, :teaching_asistant_score, :project_id, :is_test

  belongs_to :homework_common
  belongs_to :user
  has_many :student_works_evaluation_distributions, :dependent => :destroy
  has_many :student_works_scores, :dependent => :destroy
  belongs_to :project
  has_many :student_work_tests, order: 'id desc'

  before_destroy :delete_praise
  before_save :set_program_score, :set_src

  acts_as_attachable

  def delete_praise
    PraiseTread.where("praise_tread_object_id = #{self.id} AND praise_tread_object_type = 'StudentWork'").destroy_all
  end

  def last_test
    student_work_tests.order('id desc').first
  end

  private 
  def set_program_score
    if homework_common.is_program_homework?       #编程作业，学生提交作品后计算系统得分
        #根据最后一次测试计算得分
        unless last_test
          self.system_score = 0
        else
          self.system_score = last_test.test_score
        end
    end

  end
  def set_src
    self.description = last_test.src if last_test
  end

end