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
    people = []
    course.members.each do |member|
      role_id = member.roles.first.id
      if TeacherRoles.include? role_id
        people <<  member.user
      end
    end
    people.include?(user)
  end
  #当前用户是不是指定课程的学生
  def is_cur_course_student? course
    people = []
    course.members.each do |member|
      if StudentRoles.include? member.roles.first.id
        people <<  member.user
      end
    end
    people.include?(User.current)
  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

  #获取指定作业的平均评分
  def homework_score homework
     stars_reates = homework.rates(:quality)
     sum = 0
     stars_reates.each do |star_reates|
        sum = sum + star_reates.stars
     end
     stars_reates_count = stars_reates.count == 0 ? 1 : stars_reates.count
     format("%.2f", sum * 1.0 / stars_reates_count)
  end
end