diff --git a/db/migrate/20150918063404_normal_homework_type.rb b/db/migrate/20150918063404_normal_homework_type.rb
new file mode 100644
index 000000000..def3b0024
--- /dev/null
+++ b/db/migrate/20150918063404_normal_homework_type.rb
@@ -0,0 +1,8 @@
+class NormalHomeworkType < ActiveRecord::Migration
+  def up
+    HomeworkCommon.where("homework_type = 0").update_all(:homework_type => 1)
+  end
+
+  def down
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index a3c8277bb..9749410a0 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 => 20150917071652) do
+ActiveRecord::Schema.define(:version => 20150918063404) do
 
   create_table "activities", :force => true do |t|
     t.integer  "act_id",                                  :null => false
@@ -476,6 +476,13 @@ ActiveRecord::Schema.define(:version => 20150917071652) do
 
   add_index "delayed_jobs", ["priority", "run_at"], :name => "delayed_jobs_priority"
 
+  create_table "discuss_demos", :force => true do |t|
+    t.string   "title"
+    t.text     "body"
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
+  end
+
   create_table "documents", :force => true do |t|
     t.integer  "project_id",                :default => 0,  :null => false
     t.integer  "category_id",               :default => 0,  :null => false
@@ -490,23 +497,26 @@ ActiveRecord::Schema.define(:version => 20150917071652) do
   add_index "documents", ["created_on"], :name => "index_documents_on_created_on"
   add_index "documents", ["project_id"], :name => "documents_project_id"
 
-  create_table "dts", :force => true do |t|
-    t.string   "IPLineCode"
-    t.string   "Description"
-    t.string   "Num"
-    t.string   "Variable"
-    t.string   "TraceInfo"
-    t.string   "Method"
+  create_table "dts", :primary_key => "Num", :force => true do |t|
+    t.string   "Defect",        :limit => 50
+    t.string   "Category",      :limit => 50
     t.string   "File"
-    t.string   "IPLine"
-    t.string   "Review"
-    t.string   "Category"
-    t.string   "Defect"
-    t.string   "PreConditions"
-    t.string   "StartLine"
+    t.string   "Method"
+    t.string   "Module",        :limit => 20
+    t.string   "Variable",      :limit => 50
+    t.integer  "StartLine"
+    t.integer  "IPLine"
+    t.string   "IPLineCode",    :limit => 200
+    t.string   "Judge",         :limit => 15
+    t.integer  "Review",        :limit => 1
+    t.string   "Description"
+    t.text     "PreConditions", :limit => 2147483647
+    t.text     "TraceInfo",     :limit => 2147483647
+    t.text     "Code",          :limit => 2147483647
     t.integer  "project_id"
-    t.datetime "created_at",    :null => false
-    t.datetime "updated_at",    :null => false
+    t.datetime "created_at"
+    t.datetime "updated_at"
+    t.integer  "id",                                  :null => false
   end
 
   create_table "enabled_modules", :force => true do |t|
@@ -609,11 +619,12 @@ ActiveRecord::Schema.define(:version => 20150917071652) do
     t.text     "description"
     t.date     "publish_time"
     t.date     "end_time"
-    t.integer  "homework_type", :default => 1
+    t.integer  "homework_type",    :default => 1
     t.string   "late_penalty"
     t.integer  "course_id"
-    t.datetime "created_at",                   :null => false
-    t.datetime "updated_at",                   :null => false
+    t.datetime "created_at",                      :null => false
+    t.datetime "updated_at",                      :null => false
+    t.integer  "teacher_priority", :default => 1
   end
 
   create_table "homework_detail_manuals", :force => true do |t|
@@ -906,7 +917,6 @@ ActiveRecord::Schema.define(:version => 20150917071652) do
     t.datetime "created_on"
     t.integer  "comments_count",               :default => 0,  :null => false
     t.integer  "course_id"
-    t.datetime "updated_on"
   end
 
   add_index "news", ["author_id"], :name => "index_news_on_author_id"
@@ -1318,7 +1328,7 @@ ActiveRecord::Schema.define(:version => 20150917071652) do
     t.datetime "updated_at",                                                       :null => false
     t.integer  "late_penalty",                                  :default => 0
     t.integer  "absence_penalty",                               :default => 0
-    t.integer  "system_score"
+    t.float    "system_score",                                  :default => 0.0
     t.boolean  "is_test",                                       :default => false
   end