diff --git a/app/controllers/homework_attach_controller.rb b/app/controllers/homework_attach_controller.rb
index 83c26b713..07278ec45 100644
--- a/app/controllers/homework_attach_controller.rb
+++ b/app/controllers/homework_attach_controller.rb
@@ -451,8 +451,7 @@ class HomeworkAttachController < ApplicationController
           homework.score = @m_score
           homework.is_teacher_score = 1
         else
-          homework.score = (homework.score.nil? ? 0 : homework.score + @m_score) / homework.rates(:quality).count
-
+          homework.score = homework.rates(:quality).select("avg(stars)")
         end
       else
         if is_teacher == 1
diff --git a/db/migrate/20141231020031_add_data_to_student_for_course.rb b/db/migrate/20141231020031_add_data_to_student_for_course.rb
new file mode 100644
index 000000000..a507f907c
--- /dev/null
+++ b/db/migrate/20141231020031_add_data_to_student_for_course.rb
@@ -0,0 +1,13 @@
+class AddDataToStudentForCourse < ActiveRecord::Migration
+  def change
+    Course.all.each do |course|
+
+      course.members.each do |m|
+        if m && m.user && m.user.allowed_to?(:student,course) && StudentsForCourse.find_by_student_id(m.user_id).nil?
+          StudentsForCourse.create(:student_id => m.user_id, :course_id => course.id)
+        end
+      end
+
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 528ebdee6..cdd827442 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20141230081744) do
+ActiveRecord::Schema.define(:version => 20141231020031) do
 
   create_table "activities", :force => true do |t|
     t.integer "act_id",   :null => false