From 221a73309fc0f49a16a70d3ed3e9beab7fd73452 Mon Sep 17 00:00:00 2001
From: huang <huang.jingquan@163.com>
Date: Tue, 17 Nov 2015 20:23:39 +0800
Subject: [PATCH] =?UTF-8?q?index=E9=A1=B5=E9=9D=A2=E5=88=A0=E6=8E=89?=
 =?UTF-8?q?=E6=97=A0=E6=95=88=E7=9A=84=E6=B5=8B=E8=AF=95?=
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---
 app/controllers/exercise_controller.rb | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/app/controllers/exercise_controller.rb b/app/controllers/exercise_controller.rb
index f19e15ba1..62be77790 100644
--- a/app/controllers/exercise_controller.rb
+++ b/app/controllers/exercise_controller.rb
@@ -5,7 +5,7 @@ class ExerciseController < ApplicationController
   before_filter :find_course, :only => [:index,:new,:create,:student_exercise_list]
 
   def index
-    # remove_invalid_exercise(@course)
+    remove_invalid_exercise(@course)
     @is_teacher = User.current.allowed_to?(:as_teacher,@course)
     if @is_teacher
       exercises = @course.exercises
@@ -231,8 +231,13 @@ class ExerciseController < ApplicationController
   end
 
   private
-  def remove_invalid_exercise
-    excercises = @course.exercises
+  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