socialforge/app/controllers/exercise_controller.rb

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class ExerciseController < ApplicationController
layout "base_courses"
before_filter :find_exercise_and_course, :only => [:create_exercise_question, :edit, :update, :show, :destroy, :commit_exercise, :commit_answer]
before_filter :find_course, :only => [:index,:new,:create,:student_exercise_list]
include ExerciseHelper
include ExerciseHelper
def index
remove_invalid_exercise(@course)
@is_teacher = User.current.allowed_to?(:as_teacher,@course)
if @is_teacher
exercises = @course.exercises
else
exercises = @course.exercises.where(:exercise_status => 2)
end
@exercises = paginateHelper exercises,20 #分页
respond_to do |format|
format.html
end
end
def show
@exercise = Exercise.find params[:id]
@is_teacher = User.current.allowed_to?(:as_teacher,@course) || User.current.admin?
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 exercise_index_url(:course_id=> @course.id)
else
@can_edit_excercise = (!has_commit_exercise?(@exercise.id,User.current.id)) || User.current.admin?
# @percent = get_percent(@exercise,User.current)
exercise_questions = @exercise.exercise_questions
@exercise_questions = paginateHelper exercise_questions,5 #分页
respond_to do |format|
format.html {render :layout => 'base_courses'}
end
end
end
def new
option = {
:exercise_name => "",
:course_id => @course.id,
:exercise_status => 1,
:user_id => User.current.id,
:time => "",
:end_time => "",
:publish_time => "",
:exercise_description => "",
:show_result => ""
}
@exercise = Exercise.create option
if @exercise
redirect_to edit_exercise_url @exercise.id
end
end
def create
if params[:exercise]
exercise = Exercise.find(params[:exercise_id]) if params[:exercise_id]
exercise ||= Exercise.new
exercise.exercise_name = params[:exercise][:exercise_name]
exercise.exercise_description = params[:exercise][:exercise_description]
exercise.end_time = params[:exercise][:end_time]
exercise.publish_time = params[:exercise][:publish_time]
exercise.user_id = User.current.id
exercise.time = params[:exercise][:time]
exercise.course_id = params[:course_id]
exercise.exercise_status = 1
if exercise.save
@exercise = exercise
respond_to do |format|
format.js
end
end
end
end
def edit
respond_to do |format|
format.html{render :layout => 'base_courses'}
end
end
def update
@exercise.exercise_name = params[:exercise][:exercise_name]
@exercise.exercise_description = params[:exercise][:exercise_description]
@exercise.time = params[:exercise][:time]
@exercise.end_time = params[:exercise][:end_time]
@exercise.publish_time = params[:exercise][:publish_time]
@exercise.show_result = params[:exercise][:show_result]
if @exercise.save
respond_to do |format|
format.js
end
else
render_404
end
end
def destroy
if @exercise && @exercise.destroy
if @is_teacher
exercises = Exercise.where("course_id =?", @course.id)
else
exercises = Exercise.where("course_id =? and exercise_status =?", @course.id, 2)
end
@exercises = paginateHelper exercises,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.exercise_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[:question_title].nil? || params[:question_title].empty? ? l(:label_enter_single_title) : params[:question_title]
option = {
:question_title => question_title,
:question_type => params[:question_type] || 1,
:question_number => @exercise.exercise_questions.count + 1,
:question_score => params[:question_score]
}
@exercise_questions = @exercise.exercise_questions.new option
# params[:question_answer] 题目选项
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 = {
:choice_position => i,
:choice_text => answer
}
@exercise_questions.exercise_choices.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
@exercise.exercise_questions.where("question_number > #{params[:quest_num].to_i}").update_all(" question_number = question_number + 1")
# @exercise_question_num = params[:quest_num].to_i
@exercise_questions.question_number = params[:quest_num].to_i + 1
end
if @exercise_questions.save
# params[:exercise_choice] 标准答案参数
# 问答题标准答案有三个,单独处理
if @exercise_questions.question_type == 3
for i in 1..params[:exercise_choice].count
standart_answer = ExerciseStandardAnswer.new
standart_answer.exercise_question_id = @exercise_questions.id
standart_answer.answer_text = params[:exercise_choice].values[i-1]
standart_answer.save
end
else
standart_answer = ExerciseStandardAnswer.new
standart_answer.exercise_question_id = @exercise_questions.id
if @exercise_questions.question_type == 1
standart_answer.exercise_choice_id = sigle_selection_standard_answer(params[:exercise_choice])
else
standart_answer.exercise_choice_id = multiselect_standard_answer(params[:exercise_choice])
end
standart_answer.save
end
respond_to do |format|
format.js
end
end
end
# 修改题目
# params[:exercise_question] The id of exercise_question
# params[:question_answer] eg:A、B、C选项
def update_exercise_question
@exercise_question = ExerciseQuestion.find params[:exercise_question]
@exercise_question.question_title = params[:question_title].nil? || params[:question_title].empty? ? l(:label_enter_single_title) : params[:question_title]
@exercise_question.question_score = params[:question_score]
# 处理选项:如果选了某个选项,那么则要删除之前的选项
if params[:question_answer]
@exercise_question.exercise_choices.each do |answer|
answer.destroy unless params[:question_answer].keys.include? answer.id.to_s
end
for i in 1..params[:question_answer].count
question = @exercise_question.exercise_choices.find_by_id params[:question_answer].keys[i-1]
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]
if question
question.choice_position = i
question.choice_text = answer
question.save
else
question_option = {
:choice_position => i,
:choice_text => answer
}
@exercise_question.exercise_choices.new question_option
end
end
end
# 更新标准答案
if params[:exercise_choice]
if @exercise_question.question_type == 3
for i in 1..params[:exercise_choice].count
# 找到对应的标准答案
question_standart = @exercise_question.exercise_standard_answers.find_by_id params[:exercise_choice].keys[i-1]
# 标准答案值
answer_standart = (params[:exercise_choice].values[i-1].nil? || params[:exercise_choice].values[i-1].empty?) ? l(:label_new_answer) : params[:exercise_choice].values[i-1]
if question_standart
question_standart.answer_text = answer_standart
question_standart.save
else
standart_answer_option = {
:answer_text => question_standart
}
@exercise_question.exercise_standard_answers.new standart_answer_option
end
end
else
answer_standart = @exercise_question.exercise_standard_answers.first
answer_standart.exercise_choice_id = @exercise_question.question_type == 1 ? sigle_selection_standard_answer(params[:exercise_choice]) : multiselect_standard_answer(params[:exercise_choice])
answer_standart.save
end
@exercise_question.save
respond_to do |format|
format.js
end
end
end
# 删除题目
def delete_exercise_question
@exercise_question = ExerciseQuestion.find params[:exercise_question]
@exercise = @exercise_question.exercise
exercise_questions = @exercise.exercise_questions.where("question_number > #{@exercise_question.question_number}")
exercise_questions.each do |question|
question.question_number -= 1
question.save
end
if @exercise_question && @exercise_question.destroy
respond_to do |format|
format.js
end
end
end
# 发布试卷
def publish_excercise
@exercise.exercise_status = 2
@exercise.publish_time = Time.now
if @exercise.save
if params[:is_remote]
redirect_to exercise_index_url(:course_id => @course.id)
else
respond_to do |format|
format.js
end
end
end
end
# 重新发布试卷
def republish_excercise
@exercise.exercise_questions.each do |exercise_question|
exercise_question.exercise_ansers.destroy_all
end
# @poll.poll_users.destroy_all
# @poll.polls_status = 1
# @poll.save
# respond_to do |format|
# format.js
# 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
# 学生提交答卷,选中答案的过程中提交
def commit_answer
eq = ExerciseQuestion.find(params[:exercise_question_id])
# 已提交过的则不允许答题
if has_commit_exercise?(@exercise.id,User.current.id) && (!User.current.admin?)
render :json => {:text => "failure"}
return
end
if eq.question_type == 1
# 单选题
ea = ExerciseAnswer.find_by_exercise_question_id_and_user_id(params[:exercise_question_id],User.current.id)
if ea.nil?
# 尚未答该题,添加答案
ea = ExerciseAnswer.new
ea.user_id = User.current.id
ea.exercise_question_id = params[:exercise_question_id]
end
#修改该题对应答案
ea.exercise_choice_id = params[:exercise_choice_id]
if ea.save
# 保存成功返回成功信息及当前以答题百分比
@percent = get_percent(@exercise,User.current)
render :json => {:text => "ok" ,:percent => format("%.2f" ,@percent)}
else
#返回失败信息
render :json => {:text => "failure"}
end
elsif eq.question_type == 2
#多选题
ea = ExerciseAnswer.find_by_exercise_question_id_and_user_id(params[:exercise_question_id],User.current.id)
if ea.nil?
#尚未答该题,添加答案
ea = ExerciseAnswer.new
ea.user_id = User.current.id
ea.exercise_question_id = params[:exercise_question_id]
ea.exercise_choice_id = params[:exercise_choice_id]
if ea.save
@percent = get_percent(@exercise,User.current)
render :json => {:text => "true",:percent => format("%.2f" ,@percent)}
else
render :json => {:text => "failure"}
end
else
#pv不为空则当前选项之前已被选择再次点击则是不再选择该项故删除该答案
if pv.delete
@percent = get_percent(@exercise, User.current)
render :json => {:text => "false" ,:percent => format("%.2f" , @percent)}
else
render :json => {:text => "failure"}
end
end
elsif eq.question_type == 3
#单行文本,多行文本题
ea = ExerciseAnswer.find_by_exercise_question_id_and_user_id(params[:exercise_question_id], User.current.id)
if ea.nil?
# ea为空之前尚未答题添加答案
if params[:answer_text].nil? || params[:answer_text].blank?
#用户提交空答案,视作不作答
@percent = get_percent(@exercise,User.current)
render :json => {:text => ea.answer_text,:percent => format("%.2f", @percent)}
else
#添加答案
ea = ExerciseAnswer.new
ea.user_id = User.current.id
ea.exercise_question_id = params[:exercise_question_id]
ea.answer_text = params[:answer_text]
if ea.save
@percent = get_percent(@exercise,User.current)
render :json => {:text => pv.vote_text,:percent => format("%.2f",@percent)}
else
render :json => {:text => "failure"}
end
end
else
# ea不为空说明用户之前已作答
if params[:answer_text].nil? || params[:answer_text].blank?
# 用户提交空答案,视为删除答案
if ea.delete
@percent = get_percent(@exercise,User.current)
render :json => {:text => ea.answer_text,:percent => format("%.2f", @percent)}
else
render :json => {:text => "failure"}
end
else
#用户修改答案
ea.answer_text = params[:answer_text]
if ea.save
@percent = get_percent(@exercise,User.current)
render :json => {:text => pv.vote_text,:percent => format("%.2f", @percent)}
else
render :json => {:text => "failure"}
end
end
end
else
render :json => {:text => "failure"}
end
end
# 提交问卷
def commit_exercise
# 老师不需要提交
if User.current.allowed_to?(:as_teacher,@course)
redirect_to exercise_url(@exercise)
# REDO: 提示提交成功
else
# 答题过程中需要统计完成量
@uncomplete_question = get_uncomplete_question(@exercise, User.current)
# 获取改学生的考试得分
score = calculate_student_score(@exercise, User.current)
if @uncomplete_question.count < 1
# 查看是否有已提交记录
eu = get_exercise_user(@exercise.id, User.current.id)
eu.user_id = User.current.id
eu.exercise_id = @exercise.id
eu.score = score
if eu.save
#redirect_to poll_index_path(:polls_group_id => @course.id,:polls_type => 'Course')
@status = 0 #提交成功
else
@status = 2 #未知错误
end
else
@status = 1 #有未做得必答题
end
respond_to do |format|
format.js
end
end
end
# 计算学生得分
def calculate_student_score(exercise, user)
score = 0
exercise_qustions = exercise.exercise_questions
exercise_qustions.each do |question|
answer = get_user_answer(question, user)
standard_answer = get_user_standard_answer(question, user)
# 问答题有多个答案
if question.question_type == 3
if standard_answer.exercise_choice_id.include?(answer.exercise_choice_id)
score = score + question.question_score
end
else
if answer.exercise_choice_id == standard_answer.exercise_choice_id
score = score + question.question_score
end
end
end
score
end
private
# ExerciseUser记录用户是否已提交问卷有对应的记录则已提交没有则新建一个
def get_exercise_user exercise_id,user_id
eu = ExerciseUser.find_by_exercise_id_and_user_id(exercise_id,user_id)
if eu.nil?
eu = ExerciseUser.new
end
eu
end
#获取未完成的题目
def get_uncomplete_question exercise,user
all_questions = exercise.exercise_questions
uncomplete_question = []
all_questions.each do |question|
answers = get_user_answer(question, user)
if answers.nil? || answers.count < 1
uncomplete_question << question
end
end
uncomplete_question
end
# 获取当前学生回答问题的答案
def get_user_answer(question,user)
user_answer = question.exercise_answers.where("#{ExerciseAnswer.table_name}.user_id = #{user.id}")
user_answer
end
# 获取问题的标准答案
def get_user_standard_answer(question,user)
standard_answer = question.exercise_standard_answers
standard_answer
end
# 是否完成了答题
def get_complete_question(exercise,user)
questions = exercise.exercise_questions
complete_question = []
questions.each do |question|
answers = get_user_answer(question,user)
if !(answers.nil? || answers.count < 1)
complete_question << question
end
end
complete_question
end
# 获取答题百分比
def get_percent exercise,user
complete_count = get_complete_question(exercise,user).count
if exercise.exercise_questions.count == 0
return 0
else
return (complete_count.to_f / exercise.exercise_questions.count.to_f)*100
end
end
def remove_invalid_exercise(course)
exercises = course.exercises.where("exercise_name=?","")
unless exercises.empty?
exercises.each do |exercise|
exercise.destroy
end
end
end
def find_exercise_and_course
@exercise = Exercise.find params[:id]
@course = Course.find @exercise.course_id
rescue Exception => e
render_404
end
def find_course
@course = Course.find params[:course_id]
rescue Exception => e
render_404
end
end