diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index 2c37285fa..7aca31dbc 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -54,12 +54,12 @@ class CoursesController < ApplicationController
       #                        u.login), s.name from courses c, users u, user_extensions ue, schools s where c.is_delete=0 and
       #                        c.tea_id=u.id and u.id=ue.user_id and ue.school_id=s.id")
 
-      # @courses = Course.where(is_delete: 0, is_hidden: 0).includes([teacher: :user_extension], :school)
+      @courses = Course.where(is_delete: 0, is_hidden: 0).includes(:course_modules, :course_members, teacher: [user_extension: :school])
 
-      @courses = Course.where(is_delete: 0, is_hidden: 0).select("courses.id, courses.tea_id, courses.name, courses.exercises_count, courses.polls_count,
-                       courses.is_public, courses.is_end, courses.visits, courses.course_members_count,courses.homework_commons_count,(SELECT MAX(created_at)
-                       FROM `course_activities` WHERE course_activities.course_id = courses.id) AS a")
-                       .order("courses.id = 1309 desc, a desc")
+      # @courses = Course.where(is_delete: 0, is_hidden: 0).select("courses.id, courses.tea_id, courses.name, courses.exercises_count, courses.polls_count,
+      #                  courses.is_public, courses.is_end, courses.visits, courses.course_members_count,courses.homework_commons_count,(SELECT MAX(created_at)
+      #                  FROM `course_activities` WHERE course_activities.course_id = courses.id) AS a")
+      #                  .order("courses.id = 1309 desc, a desc")
     elsif @order == "mine"
       @courses = Course.joins(:course_members)
                        .where("is_delete = 0 AND is_hidden = 0 AND course_members.user_id = ?", @user.id)
@@ -103,6 +103,7 @@ class CoursesController < ApplicationController
   # GET /courses/1
   # GET /courses/1.json
   def show
+    # render :json => {first_category_url: module_url(course.course_modules.where.not(module_type: "activity").where(hidden: 0).first, course)}
   end
 
   # GET /courses/new
diff --git a/app/controllers/exercise_answers_controller.rb b/app/controllers/exercise_answers_controller.rb
index c709980f9..81f117daf 100644
--- a/app/controllers/exercise_answers_controller.rb
+++ b/app/controllers/exercise_answers_controller.rb
@@ -1,6 +1,8 @@
 class ExerciseAnswersController < ApplicationController
   before_action :require_login
   before_action :get_exercise_question
+  before_action :commit_exercise_time
+  include ExercisesHelper
 
   def create  #每一次答案的点击，请求一次，实训题不在这里回答
     ActiveRecord::Base.transaction do
@@ -31,6 +33,7 @@ class ExerciseAnswersController < ApplicationController
             end
           elsif q_type == 1   #多选题的
             choice_ids = params[:exercise_choice_id].present? ? params[:exercise_choice_id] : []
+
             ea_ids = ea.pluck(:exercise_choice_id)
             common_answer_ids = choice_ids & ea_ids   #已经存在的试卷选项id
             new_ids = choice_ids - common_answer_ids   # 新增的id
@@ -113,4 +116,24 @@ class ExerciseAnswersController < ApplicationController
     end
   end
 
+  def commit_exercise_time
+    @exercise_user_current = @exercise.exercise_users.exercise_commit_users(current_user.id).first  #查找当前用户是否有过答题
+    if @exercise.exercise_status == 3 || (@exercise.time > 0 && ((@exercise_user_current&.start_at + (@exercise.time.to_i + 1).minutes) < Time.now))
+      #当前用户存在，且已回答，且试卷时间已过，且未提交，则自动提交。最好是前端控制
+      objective_score = calculate_student_score(@exercise,current_user)[:total_score]
+      subjective_score = @exercise_user_current&.subjective_score < 0.0 ? 0.0 : @exercise_user_current&.subjective_score
+      total_score = objective_score + subjective_score
+      commit_option = {
+          :status => 1,
+          :commit_status => 1,
+          :end_at => Time.now,
+          :objective_score => objective_score,
+          :score => total_score,
+          :subjective_score => subjective_score
+      }
+      @exercise_user_current.update_attributes(commit_option)
+      normal_status(-1,"考试时间已到，已交卷成功！")
+    end
+  end
+
 end
diff --git a/app/helpers/exercises_helper.rb b/app/helpers/exercises_helper.rb
index 4f4c015eb..95ec0ac24 100644
--- a/app/helpers/exercises_helper.rb
+++ b/app/helpers/exercises_helper.rb
@@ -478,8 +478,12 @@ module ExercisesHelper
     ex_user_end_at = ex_user.end_at
     course_member = course.students.course_find_by_ids("user_id",ex_user.user.id)
     current_user_group_id = course_member.first.course_group_id if course_member.present?
-    course_group = course.course_groups.by_group_ids(current_user_group_id)
-    current_user_group_name = course_group.first.name if course_group.present?
+    if current_user_group_id == 0
+      current_user_group_name = "未分班"
+    else
+      course_group = course.course_groups.by_group_ids(current_user_group_id)
+      current_user_group_name = course_group.first.name if course_group.present?
+    end
     teacher_review = ex_user.subjective_score < 0.0 ? false : true
     if ex_user_exercise_status != 3 || commit_status != 1 #试卷未截止或用户未提交
       # if (user_status != 0 && ex_user_exercise_status != 3)|| commit_status == 0 #不为教师，且试卷未截止;当前用户未提交 不显示分数
diff --git a/app/helpers/polls_helper.rb b/app/helpers/polls_helper.rb
index 5b4702174..56bbb9b77 100644
--- a/app/helpers/polls_helper.rb
+++ b/app/helpers/polls_helper.rb
@@ -110,14 +110,20 @@ module PollsHelper
       poll_user_name = user.nickname
     end
     course_member = course_members.find_by(user_id:user.id)
-    current_user_group_id = course_members.present? ? course_member.course_group_id : nil
-    course_group = course.course_groups.find_by_id(current_user_group_id)
+    course_group_id = course_members.present? ? course_member.course_group_id : nil
+    if course_group_id == 0
+      course_group_name = "未分班"
+    else
+      course_group = course.course_groups.find_by_id(course_group_id)
+      course_group_id = course_group&.id
+      course_group_name = course_group&.name
+    end
     {
         "user_name":poll_user_name,
         "user_id": user.id,
         "student_id":user_student_id,
-        "group_name":course_group.try(:name),
-        "group_id":course_group.try(:id),
+        "group_name":course_group_name,
+        "group_id":course_group_id,
         "login":user.login
     }
   end
diff --git a/app/models/course.rb b/app/models/course.rb
index a7c8a4ca8..c0c7f1f23 100644
--- a/app/models/course.rb
+++ b/app/models/course.rb
@@ -7,7 +7,7 @@ class Course < ApplicationRecord
 
   has_many :course_infos, dependent: :destroy
   # 课堂左侧导航栏的模块
-  has_many :course_modules, dependent: :destroy
+  has_many :course_modules, -> {where hidden: 0}, dependent: :destroy
   has_many :board_course_modules, -> { board_module }, class_name: "CourseModule"
   has_many :attachment_course_modules, -> { attachment_module }, class_name: "CourseModule"
   has_many :common_course_modules, -> { common_homework_module }, class_name: "CourseModule"
diff --git a/app/views/courses/index.json.jbuilder b/app/views/courses/index.json.jbuilder
index ec9ebfc3f..23e8715af 100644
--- a/app/views/courses/index.json.jbuilder
+++ b/app/views/courses/index.json.jbuilder
@@ -10,9 +10,9 @@ json.courses do
     json.tasks_count get_tasks_count course
     json.visits course.visits
     json.is_public course.is_public
-    json.is_accessible @user.present? ? @user.member_of_course?(course) || @user.creator_of_course?(course) : course.is_public == 1
+    json.is_accessible course.is_public? ? true : (course.tea_id == @user.id || @user.course_identity(course) < 5)
     json.is_end course.is_end
-    json.first_category_url module_url(course.course_modules.where.not(module_type: "activity").where(hidden: 0).order(position: :desc).first, course)
+    json.first_category_url module_url(course.course_modules.first, course)
   end
 end
 json.courses_count @courses_count