trustieforge/app/controllers/exercise_controller.rb

class ExerciseController < ApplicationController
  layout "base_courses"

  before_filter :find_course, :only => [:index,:new,:create,:student_exercise_list]
  def index
    @is_teacher = User.current.allowed_to?(:as_teacher,@course)
    if @is_teacher
      exercises = @course.exercises
    else
      exercises = @course.exercises.where(:exercise_status => 1)
    end
    @exercises = paginateHelper exercises,20 #分页
    respond_to do |format|
      format.html
    end
  end

  def show
    @exercise = Exercise.find params[:id]
    if @exercise.exercise_status != 2 && (!User.current.allowed_to?(:as_teacher,@course) || User.current.admin?)
      render_403
      return
    end
    #已提交问卷的用户不能再访问该界面
    if has_commit_exercise?(@exercise.id, User.current.id) && (!User.current.admin?)
      redirect_to poll_index_url(:course_id=> @course.id)
    else
      @can_edit_poll = (!has_commit_exercise?(@exercise.id,User.current.id)) || User.current.admin?
      @percent = get_percent(@exercise,User.current)
      poll_questions = @poll.poll_questions
      @poll_questions = paginateHelper poll_questions,5 #分页
      respond_to do |format|
        format.html {render :layout => 'base_courses'}
      end
    end
  end

  def new
    @exercise = Exercise.new
    respond_to do |format|
      format.html{render :layout => 'base_courses'}
    end
  end

  def create

  end

  def edit
    respond_to do |format|
      format.html{render :layout => 'base_courses'}
  end
  end

  def update
    @exercise.exercise_name = params[:exercise_name]
    @exercise.exercise_description = params[:exercise_name]
    @exercise.start_at = params[:start_at]
    @exercise.end_at = params[:end_at]
    if @exercise.save
      respond_to do |format|
        format.js
      end
    else
      render_404
      end
  end

  def destroy
    if @exercise && @exercise.destroy
      if @is_teacher
        polls = Poll.where("polls_type = 'Course' and polls_group_id = #{@course.id}")
      else
        polls = Poll.where("polls_type = 'Course' and polls_group_id = #{@course.id} and polls_status = 2")
      end
      @polls = paginateHelper polls,20 #分页
      respond_to do |format|
        format.js
      end
    end
  end

  #统计结果
  def statistics_result
    @exercise = Exercise.find(params[:id])
    exercise_questions = @exercise.poll_questions
    @exercise_questions = paginateHelper exercise_questions, 5
    respond_to do |format|
      format.html{render :layout => 'base_courses'}
    end
  end

  #添加题目
  #question_type 1：单选 2：多选 3：填空题
  def create_exercise_question
    question_title = params[:exercise_questions_title].nil? || params[:poll_questions_title].empty? ? l(:label_enter_single_title) : params[:poll_questions_title]
    option = {
        :is_necessary => (params[:is_necessary]=="true" ? 1 : 0),
        :question_title => question_title,
        :question_type => params[:question_type] || 1,
        :question_number => @poll.poll_questions.count + 1
    }
    @poll_questions = @poll.poll_questions.new option
    if params[:question_answer]
      for i in 1..params[:question_answer].count
        answer = (params[:question_answer].values[i-1].nil? || params[:question_answer].values[i-1].empty?) ? l(:label_new_answer) : params[:question_answer].values[i-1]
        question_option = {
            :answer_position => i,
            :answer_text => answer
        }
        @poll_questions.poll_answers.new question_option
      end
    end
    # 如果是插入的话，那么从插入的这个id以后的question_num都将要+1
    if params[:quest_id]
      @is_insert = true
      @poll.poll_questions.where("question_number > #{params[:quest_num].to_i}").update_all(" question_number = question_number + 1")
      @poll_question_num = params[:quest_num].to_i
      @poll_questions.question_number = params[:quest_num].to_i + 1
    end
    if @poll_questions.save
      respond_to do |format|
        format.js
      end
    end

  end

  #发布问卷
  def publish_excercise
    @exercise.exercise_status = 2
    @exercise.publish_time = Time.now
    if @exercise.save
      if params[:is_remote]
        redirect_to poll_index_url(:course_id => @course.id)
      else
        respond_to do |format|
          format.js
        end
      end
    end
  end

  def student_exercise_list
    @is_teacher = User.current.allowed_to?(:as_teacher,@course) || User.current.admin?
    @exercise = Exercise.find params[:id]
    @all_exercises = @course.exercises.order("created_at desc")
    @exercise_count = @exercise.exercise_users.where('score is not NULL').count
    if @is_teacher || (!@exercise.exercise_users.where(:user_id => User.current.id).empty? && Time.parse(@exercise.end_time.to_s).strftime("%Y-%m-%d-%H-%M-%S") <= Time.now.strftime("%Y-%m-%d-%H-%M-%S"))
      @exercise_users_list = @exercise.exercise_users.where('score is not NULL')
      @show_all = true;
    elsif !@exercise.exercise_users.where(:user_id => User.current.id).empty? && Time.parse(@exercise.end_time.to_s).strftime("%Y-%m-%d-%H-%M-%S") > Time.now.strftime("%Y-%m-%d-%H-%M-%S")
      @exercise_users_list = @exercise.exercise_users.where("user_id = ? and score is not NULL",User.current.id)
    else
      @exercise_users_list = []
    end
    respond_to do |format|
      format.html
    end
  end

  private
  def find_course
    @course = Course.find params[:course_id]
  rescue Exception => e
    render_404
  end
end