diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index 859f19f19..656b61f5f 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -298,7 +298,7 @@ class UsersController < ApplicationController
   def user_homeworks
     if User.current == @user
       @page = params[:page] ? params[:page].to_i + 1 : 0
-      user_course_ids = "(" + @user.courses.visible.map{|course| course.id}.join(",") + ")"
+      user_course_ids =  @user.courses.empty? ? "(-1)" :"(" + @user.courses.visible.map{|course| course.id}.join(",") + ")"
       @homework_commons = HomeworkCommon.where("course_id in #{user_course_ids}").order("created_at desc").limit(10).offset(@page * 10)
       respond_to do |format|
         format.js
diff --git a/db/schema.rb b/db/schema.rb
index ec38d5c1d..48c5bcea5 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 => 20150906083453) do
+ActiveRecord::Schema.define(:version => 20150906091723) do
 
   create_table "activities", :force => true do |t|
     t.integer  "act_id",                                  :null => false
@@ -211,58 +211,6 @@ ActiveRecord::Schema.define(:version => 20150906083453) do
 
   add_index "changesets_issues", ["changeset_id", "issue_id"], :name => "changesets_issues_ids", :unique => true
 
-  create_table "code_review_assignments", :force => true do |t|
-    t.integer "issue_id"
-    t.integer "change_id"
-    t.integer "attachment_id"
-    t.string  "file_path"
-    t.string  "rev"
-    t.string  "rev_to"
-    t.string  "action_type"
-    t.integer "changeset_id"
-  end
-
-  create_table "code_review_project_settings", :force => true do |t|
-    t.integer  "project_id"
-    t.integer  "tracker_id"
-    t.datetime "created_at"
-    t.datetime "updated_at"
-    t.integer  "updated_by"
-    t.boolean  "hide_code_review_tab",     :default => false
-    t.integer  "auto_relation",            :default => 1
-    t.integer  "assignment_tracker_id"
-    t.text     "auto_assign"
-    t.integer  "lock_version",             :default => 0,     :null => false
-    t.boolean  "tracker_in_review_dialog", :default => false
-  end
-
-  create_table "code_review_user_settings", :force => true do |t|
-    t.integer  "user_id",           :default => 0, :null => false
-    t.integer  "mail_notification", :default => 0, :null => false
-    t.datetime "created_at"
-    t.datetime "updated_at"
-  end
-
-  create_table "code_reviews", :force => true do |t|
-    t.integer  "project_id"
-    t.integer  "change_id"
-    t.datetime "created_at"
-    t.datetime "updated_at"
-    t.integer  "line"
-    t.integer  "updated_by_id"
-    t.integer  "lock_version",        :default => 0, :null => false
-    t.integer  "status_changed_from"
-    t.integer  "status_changed_to"
-    t.integer  "issue_id"
-    t.string   "action_type"
-    t.string   "file_path"
-    t.string   "rev"
-    t.string   "rev_to"
-    t.integer  "attachment_id"
-    t.integer  "file_count",          :default => 0, :null => false
-    t.boolean  "diff_all"
-  end
-
   create_table "comments", :force => true do |t|
     t.string   "commented_type", :limit => 30, :default => "", :null => false
     t.integer  "commented_id",                 :default => 0,  :null => false
@@ -476,13 +424,6 @@ ActiveRecord::Schema.define(:version => 20150906083453) 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
@@ -1169,18 +1110,18 @@ ActiveRecord::Schema.define(:version => 20150906083453) do
   create_table "relative_memos", :force => true do |t|
     t.integer  "osp_id"
     t.integer  "parent_id"
-    t.string   "subject",                                                   :null => false
-    t.text     "content",            :limit => 16777215,                    :null => false
+    t.string   "subject",                               :null => false
+    t.text     "content",                               :null => false
     t.integer  "author_id"
-    t.integer  "replies_count",                          :default => 0
+    t.integer  "replies_count",      :default => 0
     t.integer  "last_reply_id"
-    t.boolean  "lock",                                   :default => false
-    t.boolean  "sticky",                                 :default => false
-    t.boolean  "is_quote",                               :default => false
-    t.datetime "created_at",                                                :null => false
-    t.datetime "updated_at",                                                :null => false
-    t.integer  "viewed_count_crawl",                     :default => 0
-    t.integer  "viewed_count_local",                     :default => 0
+    t.boolean  "lock",               :default => false
+    t.boolean  "sticky",             :default => false
+    t.boolean  "is_quote",           :default => false
+    t.datetime "created_at",                            :null => false
+    t.datetime "updated_at",                            :null => false
+    t.integer  "viewed_count_crawl", :default => 0
+    t.integer  "viewed_count_local", :default => 0
     t.string   "url"
     t.string   "username"
     t.string   "userhomeurl"
@@ -1205,19 +1146,6 @@ ActiveRecord::Schema.define(:version => 20150906083453) do
 
   add_index "repositories", ["project_id"], :name => "index_repositories_on_project_id"
 
-  create_table "rich_rich_files", :force => true do |t|
-    t.datetime "created_at",                                 :null => false
-    t.datetime "updated_at",                                 :null => false
-    t.string   "rich_file_file_name"
-    t.string   "rich_file_content_type"
-    t.integer  "rich_file_file_size"
-    t.datetime "rich_file_updated_at"
-    t.string   "owner_type"
-    t.integer  "owner_id"
-    t.text     "uri_cache"
-    t.string   "simplified_type",        :default => "file"
-  end
-
   create_table "roles", :force => true do |t|
     t.string  "name",              :limit => 30, :default => "",        :null => false
     t.integer "position",                        :default => 1
@@ -1269,11 +1197,10 @@ ActiveRecord::Schema.define(:version => 20150906083453) do
     t.string   "url"
     t.string   "title"
     t.integer  "share_type"
-    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  "project_id"
     t.integer  "user_id"
-    t.string   "description"
   end
 
   create_table "softapplications", :force => true do |t|
@@ -1434,8 +1361,8 @@ ActiveRecord::Schema.define(:version => 20150906083453) do
     t.integer  "zip_code"
     t.datetime "created_at",                         :null => false
     t.datetime "updated_at",                         :null => false
-    t.string   "technical_title"
     t.integer  "identity"
+    t.string   "technical_title"
     t.string   "student_id"
     t.string   "teacher_realname"
     t.string   "student_realname"
@@ -1503,6 +1430,9 @@ ActiveRecord::Schema.define(:version => 20150906083453) do
     t.integer  "active"
     t.datetime "created_at",    :null => false
     t.datetime "updated_at",    :null => false
+    t.integer  "level"
+    t.integer  "file"
+    t.integer  "issue"
   end
 
   create_table "user_statuses", :force => true do |t|