socialforge/app/helpers/courses_helper.rb

# encoding: utf-8
## This helper be included in applicationHelper
module CoursesHelper
=begin
1. define TeacherRoles, StudentRoles
2. define count function
3. define search by roles
4. define search member function
=end
  TeacherRoles = [3, 4, 7, 9]
  StudentRoles = [5, 10]
  AllPeople = StudentRoles+TeacherRoles
  ## return people count
  
  # 返回x项目成员数量，即roles表中定义的所有成员
  def projectCount project    
    searchCountByRoles project, AllPeople
  end

  # 返回教师数量，即roles表中定义的Manager
  def teacherCount project
    searchCountByRoles project, TeacherRoles
    # or
    # searchTeacherAndAssistant(project).count
  end

  # 返回学生数量，即roles表中定义的Reporter
  def studentCount project
    searchCountByRoles project,StudentRoles
    # or
    # searchStudent(project).count
  end

  # garble count 混淆数量
  # alias projectCountOrigin projectCount
  # def projectCount project    
  #   count = projectCountOrigin project
  #   garble count
  # end

  alias teacherCountOrigin teacherCount
  def teacherCount project
    count = teacherCountOrigin project
    garble count
  end

  alias studentCountOrigin studentCount
  def studentCount project
    count = studentCountOrigin project
    garble count
  end

  def garble count
    count = count.round( 1-count.to_s.size ).to_i
    return count.to_s if count.to_s.size.eql?(1)
    count.to_s << '+' 
  end

  # =====================================================================================
  # return people list
  def searchTeacherAndAssistant project
    searchPeopleByRoles(project, TeacherRoles)
  end

  def searchStudent project
    searchPeopleByRoles(project, StudentRoles)
  end
  # =====================================================================================

  def searchCountByRoles project, roles_id
    members = searchPeopleByRoles project, roles_id
    members.count
  end

  def searchPeopleByRoles project, roles_id
    members = []
    begin
      members = project.members.joins(:member_roles).where("member_roles.role_id IN (:role_id)", {:role_id => roles_id})
    rescue Exception => e
      logger.error "[CoursesHelper] ===> #{e}"
    end
    members
  end

  #useless
  def searchMembersByRole project, role_id
    members = []
    begin
      members = project.members.joins(:member_roles).where("member_roles.role_id = :role_id", {:role_id => role_id })
    rescue Exception => e
      logger.error "[CoursesHelper] ===> #{e}"
    end
    members
  end

  def findCourseTime project
    str = ""
    begin
      @course = Course.find_by_extra(@project.identifier)
      date_format = l(:zh_date)[:formats][:default]
      if @course
        str = DateTime.parse(@course.setup_time.to_s).strftime("#{date_format}").to_s unless @course.setup_time.blank?
        str <<  '-' unless  @course.setup_time.blank?
        str <<  DateTime.parse(@course.endup_time.to_s).strftime("#{date_format}").to_s unless @course.endup_time.blank?
      end
    rescue Exception => e
      logger.error  "[CoursesHelper] ===> #{e}"
    end
    str
  end

  def get_course_term project
    str = ( project.try(:course_extra).try(:time).to_s << '.' << project.try(:course_extra).try(:term).to_s )
    str[0..-4]
  end

  def members_to_user_ids members
    people = []
    members.each { |member|
      people << member.user_id
    }
    people
  end
  # 截至到2014-03-17 这个是最终的判断课程是否过期的方法
  def course_endTime_timeout? project
    end_time_str = Course.find_by_extra(project.try(:identifier)).try(:endup_time)
    begin
      cTime = Time.parse(end_time_str.to_s)
    rescue TypeError,ArgumentError
      cTime = Time.parse("3000-01-01")
    end
    now = Time.now

    now > cTime
  end
  def find_by_extra_from_project extra
    Course.find_by_extra(try(extra))
  end
  #判断制定用户是不是当前课程的老师
  def is_course_teacher (user,course)
    course.members.joins(:member_roles).where("member_roles.role_id IN (:role_id) and members.user_id = #{user.id}", {:role_id => TeacherRoles}).count != 0
    #修改为根据用户是否有发布任务的权限来判断用户是否是课程的老师
    #is_teacher = false
    #@membership = user.memberships.all(:conditions => Project.visible_condition(User.current))
    #@membership.each do |membership|
    #  unless(membership.project.project_type==0)
    #    if user.allowed_to?({:controller => "projects", :action => "new_homework"}, membership.project, :global => false)
    #      is_teacher = true
    #    end
    #  end
    #end
    #is_teacher
  end
  #当前用户是不是指定课程的学生
  def is_cur_course_student course
    course.members.joins(:member_roles).where("member_roles.role_id IN (:role_id) and members.user_id = #{User.current.id}", {:role_id => StudentRoles}).count != 0
    #修改：能新建占位且不能新建任务的角色判定为学生
    #is_student = false
    #@membership = User.current.memberships.all(:conditions => Project.visible_condition(User.current))
    #@membership.each do |membership|
    #  unless(membership.project.project_type==0)
    #    if !User.current.allowed_to?({:controller => "projects", :action => "new_homework"}, membership.project, :global => false) && User.current.allowed_to?({:controller => "homework_attach", :action => "new"}, membership.project, :global => false)
    #      is_student = true
    #    end
    #  end
    #end
    #is_student
  end
  #获取当前用户在指定作业下提交的作业的集合
  def cur_user_homework_for_bid bid
    cur_user_homework = HomeworkAttach.where("user_id = ? and bid_id = ?",User.current,bid.id)
    cur_user_homework
  end

  #判断当前用户对指定作业是否已经评价过
  def has_evaluation? homework
    seem_count = homework.rates(:quality).where("rater_id = ?",User.current).count
    seem_count > 0
  end

  #获取指定作业的所有成员
  def users_for_homework homework
    homework.nil? ? [] : (homework.users + [homework.user])
  end

  #获取指定作业的最终评分
  #最终评分 = 学生评分的平均分 * 0.4 +教师评分 * 0.6
  def score_for_homework homework
    return format("%.2f",(teacher_score_for_homework(homework).to_f * 0.6 + student_score_for_homework(homework).to_f * 0.4))
  end

  #获取作业的互评得分
  def student_score_for_homework homework
    member = searchPeopleByRoles(homework.bid.courses.first,TeacherRoles).first
    student_stars = homework.rates(:quality).where("rater_id <> #{member.user_id}").select("stars")
    student_stars_count = 0
    student_stars.each do |star|
      student_stars_count = student_stars_count +  star.stars
    end
    return format("%.2f",student_stars_count / (student_stars.count == 0 ? 1 : student_stars.count))
  end

  #获取作业的教师评分
  def teacher_score_for_homework homework
    member = searchPeopleByRoles(homework.bid.courses.first,TeacherRoles).first
    teacher_stars = homework.rates(:quality).where("rater_id = #{member.user_id}").select("stars").first
    return format("%.2f",teacher_stars == nil ? 0 : teacher_stars.stars)
  end
end