show

app/controllers/exercise_controller.rb

@@ -27,11 +27,19 @@ class ExerciseController < ApplicationController
       render_403
       return
     end
+
+      # 学生点击的时候即创建关联,自动保存
+      #eu = ExerciseUser.create(:user_id => User.current, :exercise_id => @exercise.id, :start_at => Time.now, :status => false)
+
     # 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
+      if !@is_teacher && !has_click_exercise?(@exercise.id, User.current.id)
+        eu = ExerciseUser.create(:user_id => User.current.id, :exercise_id => @exercise.id, :start_at => Time.now, :status => false)
+      end
       @can_edit_excercise = (!has_commit_exercise?(@exercise.id,User.current.id)) || User.current.admin?
+      @exercise_user = ExerciseUser.where("user_id=? and exercise_id=?", User.current.id, @exercise.id).first
       # @percent = get_percent(@exercise,User.current)
       exercise_questions = @exercise.exercise_questions
       @exercise_questions = paginateHelper exercise_questions,5 #分页
@@ -411,6 +419,7 @@ class ExerciseController < ApplicationController
   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

app/helpers/exercise_helper.rb

@@ -35,10 +35,21 @@ module ExerciseHelper
     end
   end
 
-  #判断用户是否已经提交了问卷
+  # 判断用户是否已经提交了问卷
+  # status 为0的时候是用户点击试卷。为1表示用户已经提交
   def has_commit_exercise?(exercise_id, user_id)
-    pu = ExerciseUser.find_by_exercise_id_and_user_id(exercise_id, user_id)
-    if pu.nil?
+    pu = ExerciseUser.where("exercise_id=? and user_id=? and status=?",exercise_id, user_id, true)
+    if pu.empty?
+      false
+    else
+      true
+    end
+  end
+
+  # 判断学生是否点击过问卷，点击则为他保存一个记录，记录start_at
+  def has_click_exercise?(exercise_id, user_id)
+    pu = ExerciseUser.where("exercise_id=? and user_id=? and status=?",exercise_id, user_id, false)
+    if pu.empty?
       false
     else
       true

db/migrate/20151120021958_add_status_to_exercise_user.rb

@@ -0,0 +1,5 @@
+class AddStatusToExerciseUser < ActiveRecord::Migration
+  def change
+    add_column :exercise_users, :status, :integer
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20151119124148) do
+ActiveRecord::Schema.define(:version => 20151120021958) do
 
   create_table "activities", :force => true do |t|
     t.integer  "act_id",                                  :null => false
@@ -563,6 +563,7 @@ ActiveRecord::Schema.define(:version => 20151119124148) do
     t.datetime "created_at",  :null => false
     t.datetime "updated_at",  :null => false
     t.datetime "end_at"
+    t.integer  "status"
   end
 
   create_table "exercises", :force => true do |t|