1.增加评分的model

2.修改评分表中为教师评分的历史数据的is_teacher_score的值

app/models/seems_rateable_rates.rb

@@ -0,0 +1,3 @@
+class SeemsRateableRates < ActiveRecord::Base
+  attr_accessible :rater_id, :rateable_id, :rateable_type, :stars, :dimension, :is_teacher_score
+end

db/migrate/20141229025925_change_seems_rateable_rates.rb

@@ -0,0 +1,23 @@
+class ChangeSeemsRateableRates < ActiveRecord::Migration
+  def up
+    SeemsRateableRates.where("rateable_type = 'HomeworkAttach'").each do |rate|
+      homework = HomeworkAttach.find_by_id rate.rateable_id
+      if homework
+        course = homework.bid.courses.first
+        if course
+          teachers = []
+          course.members.each do |m|
+            teachers << m.user_id  if m && m.user && m.user.allowed_to?(:as_teacher,course)
+          end
+          if teachers.include?(rate.rater_id)
+            rate.is_teacher_score = 1
+            rate.save
+          end
+        end
+      end
+    end
+  end
+
+  def down
+  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 => 20141229025519) do
+ActiveRecord::Schema.define(:version => 20141229025925) do
 
   create_table "activities", :force => true do |t|
     t.integer "act_id",   :null => false