socialforge/app/controllers/poll_controller.rb

class PollController < ApplicationController
  before_filter :find_poll_and_course, :only => [:edit,:update,:destroy,:show,:statistics_result,:create_poll_question]
  before_filter :find_container, :only => [:new,:create, :index]
  before_filter :is_member_of_course, :only => [:index,:show]
  before_filter :is_course_teacher, :only => [:new,:create,:edit,:update,:destroy]

  def index
    if @course
      @is_teacher = User.current.allowed_to?(:as_teacher,@course)
      polls = Poll.where("polls_type = 'Course' and polls_group_id = #{@course.id}")
      @polls = paginateHelper polls,10 #分页
      respond_to do |format|
        format.html{render :layout => 'base_courses'}
      end
    elsif @project
      #项目的问卷调查相关代码
    end
  end

  def show
    @poll = Poll.find params[:id]
    poll_questions = @poll.poll_questions
    @poll_questions = paginateHelper poll_questions,3 #分页
    respond_to do |format|
      format.html {render :layout => 'base_courses'}
    end
  end

  def new
    if @course
      option = {
          :polls_name => l(:label_poll_new),
          :polls_type => @course.class.to_s,
          :polls_group_id => @course.id,
          :polls_status => 1,
          :user_id => User.current.id,
          :published_at => Time.now,
          :closed_at => Time.now,
          :polls_description => ""
      }
      @poll = Poll.create option
      if @poll
        respond_to do |format|
          format.html{render :layout => 'base_courses'}
        end
      end
    elsif @project
      #项目的问卷调查相关代码
    end
  end

  def create

  end

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

  def update
    @poll.polls_name = params[:polls_name].empty? ? l(:label_poll_title) : params[:polls_name]
    @poll.polls_description = params[:polls_description].empty? ? l(:label_poll_description) : params[:polls_description]
    if @poll.save
      respond_to do |format|
        format.js
      end
    else
      render_404
    end
  end

  def destroy
    if @poll && @poll.destroy
      respond_to do |format|
        format.js
      end
    end
  end

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

  #添加单选题
  def create_poll_question
    question_title = params[:poll_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
    if @poll_questions.save
      respond_to do |format|
        format.js
      end
    end
  end

  #修改单选题
  def update_poll_question
   a = 1
  end

  #删除单选题
  def delete_poll_question
    @poll_question = PollQuestion.find params[:poll_question]
    @poll = @poll_question.poll
    poll_questions = @poll.poll_questions.where("question_number > #{@poll_question.question_number}")
    poll_questions.each do |question|
      question.question_number -= 1
      question.save
    end
    if @poll_question && @poll_question.destroy
      respond_to do |format|
        format.js
      end
    end
  end

  private
  def find_poll_and_course
    @poll = Poll.find params[:id]
    @course = Course.find @poll.polls_group_id
  rescue Exception => e
    render_404
  end

  def find_container
    if params[:polls_type] && params[:polls_group_id]
      case params[:polls_type]
        when "Course"
          @course = Course.find_by_id params[:polls_group_id]
        when "Project"
          @project = Project.find_by_id params[:polls_group_id]
      end
    else
      render_404
    end
  end

  def is_member_of_course
    render_403 unless(@course && User.current.member_of_course?(@course))
  end

  def is_course_teacher
    render_403 unless(@course && User.current.allowed_to?(:as_teacher,@course))
  end
end