socialforge/app/models/students_for_course.rb

#encoding: utf-8
class StudentsForCourse < ActiveRecord::Base
  attr_accessible :course_id, :student_id
  
  belongs_to :course, :class_name => 'Course', :foreign_key => :course_id

  belongs_to :student, :class_name => 'User', :foreign_key => :student_id
  
  validates_presence_of :course_id, :student_id
  validates_uniqueness_of :student_id, :scope => :course_id

  after_destroy :delete_student_works, :delete_course_homework_statistic
  after_create :recovery_student_works, :create_student_works, :create_course_homework_statistic, :create_course_contribute_score

  #退出班级或删除学生时隐藏学生的作品
  def delete_student_works
    course = self.course
    homework_ids = course.homework_commons.blank? ? "(-1)" : "(" + course.homework_commons.map{|hw| hw.id}.join(",") + ")"
    student_works = StudentWork.where("user_id = #{self.student_id} && homework_common_id in #{homework_ids}")
    student_works.update_all(:is_delete => 1)
  end

  #加入班级时还原作品
  def recovery_student_works
    course = self.course
    homework_ids = course.homework_commons.blank? ? "(-1)" : "(" + course.homework_commons.map{|hw| hw.id}.join(",") + ")"
    student_works = StudentWork.where("user_id = #{self.student_id} && homework_common_id in #{homework_ids}")
    student_works.update_all(:is_delete => 0)
  end

  #加入班级时创建已发布作业的作品
  def create_student_works
    course = self.course
    course.homework_commons.each do |hw|
      if hw.homework_type != 3 && hw.student_works.where("user_id = #{self.student_id}").count == 0
        hw.student_works << StudentWork.new(:user_id => self.student_id, :name => hw.name.to_s+"的作品提交", :work_status => 0)
      end
    end
  end

  #加入班级时创建一条记录
  def create_course_homework_statistic
    if CourseHomeworkStatistics.where(:user_id => self.student_id, :course_id => self.course_id).count == 0
      course = self.course
      user = self.student
      hw_count = course.homework_commons.includes(:homework_detail_manual).where("homework_detail_manuals.comment_status > 0").count
      homework_ids = course.homework_commons.empty? ? "(-1)" : "(" + course.homework_commons.map{|hw| hw.id}.join(",") + ")"
      student_works = StudentWork.where("homework_common_id in #{homework_ids} and work_status !=0")
      is_eva_homeworks = course.homework_commons.includes(:homework_detail_manual).where("homework_commons.anonymous_comment = 0 and homework_detail_manuals.comment_status = 2")
      is_eva_student_works = StudentWork.where(:homework_common_id => is_eva_homeworks.map{|hw| hw.id})
      has_eva_homeworks = course.homework_commons.includes(:homework_detail_manual).where("homework_commons.anonymous_comment = 0 and homework_detail_manuals.comment_status = 3")
      has_eva_student_works = StudentWork.where(:homework_common_id => has_eva_homeworks.map{|hw| hw.id})

      committed_work_num = user.student_works.where("homework_common_id in #{homework_ids} and work_status != 0").count
      un_commit_work_num = (hw_count - committed_work_num) < 0 ? 0 : (hw_count - committed_work_num)
      late_commit_work_num = user.student_works.where("homework_common_id in #{homework_ids} and work_status = 2").count
      absence_evaluation_work_num = user.student_works_evaluation_distributions.where(:student_work_id => has_eva_student_works.map(&:id)).count -
          user.student_works_scores.where(:reviewer_role => 3, :student_work_id => has_eva_student_works.map(&:id)).group_by(&:student_work_id).count
      absence_evaluation_work_num = absence_evaluation_work_num < 0 ? 0 : absence_evaluation_work_num
      un_evaluation_work_num = user.student_works_evaluation_distributions.where(:student_work_id => is_eva_student_works.map(&:id)).count -
          user.student_works_scores.where(:reviewer_role => 3, :student_work_id => is_eva_student_works.map(&:id)).group_by(&:student_work_id).count
      un_evaluation_work_num = un_evaluation_work_num < 0 ? 0 : un_evaluation_work_num
      appeal_num = user.student_works_scores.where(:student_work_id => student_works.map(&:id), :appeal_status => 3).count
      average_score = user.student_works.where(:id => student_works.map(&:id)).select("AVG(student_works.work_score) as score").first ? user.student_works.where(:id => student_works.map(&:id)).select("AVG(student_works.work_score) as score").first.score : 0
      total_score = user.student_works.where(:id => student_works.map(&:id)).select("SUM(student_works.work_score) as score").first ? user.student_works.where(:id => student_works.map(&:id)).select("SUM(student_works.work_score) as score").first.score : 0
      CourseHomeworkStatistics.create(:course_id => course.id, :user_id => user.id, :committed_work_num => committed_work_num, :un_commit_work_num => un_commit_work_num,
                                     :late_commit_work_num => late_commit_work_num, :absence_evaluation_work_num => absence_evaluation_work_num, :un_evaluation_work_num => un_evaluation_work_num,
                                     :appeal_num => appeal_num, :average_score => average_score, :total_score => total_score)
    end
  end

  def delete_course_homework_statistic
    CourseHomeworkStatistics.where(:user_id => self.student_id, :course_id => self.course_id).destroy_all
  end

  def create_course_contribute_score
    ccs = CourseContributorScore.where("course_id =? and user_id =?", self.course_id, self.student_id).first
    unless ccs
      course = self.course
      user_id = self.student_id
      message_num = Message.find_by_sql("select DISTINCT me.* from messages me, boards b where b.id = me.board_id and b.course_id = #{course.id} and b.project_id = '-1' and me.author_id = #{user_id} and me.parent_id is null;").count
      message_reply_num = Message.find_by_sql("select DISTINCT me.* from messages me, boards b where b.id = me.board_id and b.course_id = #{course.id} and b.project_id = '-1' and me.author_id = #{user_id} and me.parent_id is not null").count
      news_reply_num = Comment.find_by_sql("select cm.* from comments cm, news n where cm.author_id = #{user_id} and n.course_id = #{course.id} and cm.commented_id = n.id and cm.commented_type ='News'").count

      resource_num = Attachment.find_by_sql("SELECT * FROM `attachments` where container_id = #{course.id} and author_id = #{user_id} and container_type ='Course'").count
      journal_num = JournalsForMessage.where("user_id =? and jour_id =? and jour_type =?", user_id, course.id, "Course").count
      journal_reply_num = JournalsForMessage.where("user_id =? and jour_id =? and jour_type =? and m_parent_id is not null", user_id, course.id, "Course").count
      homework_ids = course.homework_commons.empty? ? "(-1)"  : "(" + course.homework_commons.map(&:id).join(',') + ")"
      homework_journal_num = JournalsForMessage.where("user_id =? and jour_id in #{homework_ids} and jour_type =?", user_id, "HomeworkCommon").count
      news_num = News.where("author_id = #{user_id} and course_id =#{course.id}").count
      total = message_num*2 + message_reply_num*1 + news_reply_num*1 + news_num*1 + resource_num*5 + journal_num*1 + homework_journal_num*1
      CourseContributorScore.create(:course_id => self.course_id, :user_id => self.student_id, :message_num => message_num, :message_reply_num => message_reply_num, :news_reply_num => news_reply_num,
                                    :resource_num => resource_num, :journal_num => journal_num, :journal_reply_num => journal_reply_num, :total_score => total, :homework_journal_num => homework_journal_num, :news_num => news_num)
    end
  end
end