diff --git a/app/controllers/statistics_controller.rb b/app/controllers/statistics_controller.rb
index 45fc6c6cc..104bfdab9 100644
--- a/app/controllers/statistics_controller.rb
+++ b/app/controllers/statistics_controller.rb
@@ -7,6 +7,8 @@ class StatisticsController < ApplicationController
   def index
     if params[:sub_category_id].present?
       @statistics = Statistic.where(:sub_category_id => params[:sub_category_id])
+      @statistics = Statistic.find_by_sql("SELECT statistics.*, (select sum(filesize) from attachments where attachments.container_type='Statistic' and
+                                         attachments.container_id = statistics.id group by attachments.container_id) as size from statistics where sub_category_id = #{params[:sub_category_id]}  order by #{params[:type]} #{params[:order]}")
     else
       @statistics = Statistic.all
     end
diff --git a/app/models/statistic.rb b/app/models/statistic.rb
index ed51f21ed..2302bd37c 100644
--- a/app/models/statistic.rb
+++ b/app/models/statistic.rb
@@ -2,6 +2,8 @@ class Statistic < ActiveRecord::Base
   attr_accessible :description, :name, :status, :user_id, :main_category_id, :sub_category_id
   acts_as_attachable
 
+  validates_presence_of :main_category_id
+
   def creator
     User.find self.user_id
   end
diff --git a/db/schema.rb b/db/schema.rb
index 11d616f42..700a413bc 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 => 20180207065530) do
+ActiveRecord::Schema.define(:version => 20180208073155) do
 
   create_table "activities", :force => true do |t|
     t.integer  "act_id",                                  :null => false
@@ -90,11 +90,10 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.integer  "container_id"
     t.string   "container_type"
     t.integer  "dealer_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  "status",         :limit => 1, :default => 0
     t.text     "apply_reason"
-    t.boolean  "certification",               :default => false
   end
 
   create_table "apply_add_departments", :force => true do |t|
@@ -164,9 +163,8 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.string   "remarks"
     t.integer  "dealer"
     t.datetime "deal_time"
-    t.datetime "created_at",                    :null => false
-    t.datetime "updated_at",                    :null => false
-    t.boolean  "is_delete",  :default => false
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
   end
 
   add_index "apply_user_authentications", ["user_id"], :name => "index_apply_user_authentications_on_user_id"
@@ -987,9 +985,8 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
   create_table "departments", :force => true do |t|
     t.string   "name"
     t.integer  "school_id"
-    t.datetime "created_at",                    :null => false
-    t.datetime "updated_at",                    :null => false
-    t.boolean  "is_auth",    :default => false
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
   end
 
   add_index "departments", ["school_id"], :name => "index_departments_on_school_id"
@@ -1017,7 +1014,6 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.datetime "created_at",   :null => false
     t.datetime "updated_at",   :null => false
     t.integer  "challenge_id"
-    t.integer  "reward"
   end
 
   add_index "discusses", ["user_id"], :name => "index_discusses_on_user_id"
@@ -1086,22 +1082,6 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
   add_index "enumerations", ["id", "type"], :name => "index_enumerations_on_id_and_type"
   add_index "enumerations", ["project_id"], :name => "index_enumerations_on_project_id"
 
-  create_table "evaluate_records", :force => true do |t|
-    t.integer  "user_id"
-    t.integer  "shixun_id"
-    t.integer  "game_id"
-    t.integer  "consume_time"
-    t.datetime "created_at",   :null => false
-    t.datetime "updated_at",   :null => false
-    t.float    "file_update"
-    t.float    "git_pull"
-    t.float    "create_pod"
-    t.float    "pod_execute"
-    t.float    "student_work"
-    t.float    "test_cases"
-    t.float    "retry"
-  end
-
   create_table "exercise_answers", :force => true do |t|
     t.integer  "user_id"
     t.integer  "exercise_question_id"
@@ -1112,54 +1092,6 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.integer  "score",                :default => -1
   end
 
-  create_table "exercise_bank_choices", :force => true do |t|
-    t.integer  "exercise_bank_question_id"
-    t.text     "choice_text"
-    t.integer  "choice_position"
-    t.datetime "created_at",                :null => false
-    t.datetime "updated_at",                :null => false
-  end
-
-  add_index "exercise_bank_choices", ["exercise_bank_question_id"], :name => "index_exercise_bank_choices_on_exercise_bank_question_id"
-
-  create_table "exercise_bank_questions", :force => true do |t|
-    t.text     "question_title"
-    t.integer  "question_type"
-    t.integer  "question_number"
-    t.integer  "question_score"
-    t.integer  "exercise_bank_id"
-    t.integer  "max_choices"
-    t.integer  "min_choices"
-    t.datetime "created_at",       :null => false
-    t.datetime "updated_at",       :null => false
-  end
-
-  add_index "exercise_bank_questions", ["exercise_bank_id"], :name => "index_exercise_bank_questions_on_exercise_bank_id"
-
-  create_table "exercise_bank_standard_answers", :force => true do |t|
-    t.integer  "exercise_bank_question_id"
-    t.integer  "exercise_bank_choice_id"
-    t.text     "answer_text"
-    t.datetime "created_at",                :null => false
-    t.datetime "updated_at",                :null => false
-  end
-
-  create_table "exercise_banks", :force => true do |t|
-    t.string   "name"
-    t.text     "description"
-    t.integer  "user_id"
-    t.boolean  "is_public"
-    t.integer  "quotes"
-    t.integer  "container_id"
-    t.string   "container_type"
-    t.integer  "course_list_id"
-    t.datetime "created_at",     :null => false
-    t.datetime "updated_at",     :null => false
-  end
-
-  add_index "exercise_banks", ["course_list_id"], :name => "index_exercise_banks_on_course_list_id"
-  add_index "exercise_banks", ["user_id"], :name => "index_exercise_banks_on_user_id"
-
   create_table "exercise_choices", :force => true do |t|
     t.integer  "exercise_question_id"
     t.text     "choice_text"
@@ -1207,17 +1139,13 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.integer  "exercise_status"
     t.integer  "user_id"
     t.integer  "time"
-    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.datetime "publish_time"
     t.datetime "end_time"
     t.integer  "show_result"
     t.integer  "question_random",      :default => 0
     t.integer  "choice_random",        :default => 0
-    t.boolean  "is_public",            :default => false
-    t.boolean  "score_open",           :default => true
-    t.boolean  "answer_open",          :default => true
-    t.integer  "exercise_bank_id"
   end
 
   create_table "experiences", :force => true do |t|
@@ -1307,7 +1235,6 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.string   "path"
     t.datetime "created_at",                          :null => false
     t.datetime "updated_at",                          :null => false
-    t.text     "current_code",  :limit => 2147483647
   end
 
   create_table "game_outputs", :force => true do |t|
@@ -1322,27 +1249,19 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
   create_table "games", :force => true do |t|
     t.integer  "myshixun_id"
     t.integer  "user_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  "status",              :default => 0
     t.integer  "final_score",         :default => 0
     t.integer  "challenge_id"
     t.datetime "open_time"
     t.string   "identifier"
-    t.boolean  "answer_open",         :default => false
+    t.boolean  "answer_open"
     t.datetime "end_time"
     t.integer  "retry_status",        :default => 0
     t.string   "resubmit_identifier"
   end
 
-  create_table "gitlab_urls", :force => true do |t|
-    t.integer  "myshixun_id"
-    t.string   "url"
-    t.string   "myshixun_identifier"
-    t.datetime "created_at",          :null => false
-    t.datetime "updated_at",          :null => false
-  end
-
   create_table "grades", :force => true do |t|
     t.integer  "user_id"
     t.integer  "container_id"
@@ -1465,7 +1384,6 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.boolean  "allow_late",        :default => true
     t.datetime "late_time"
     t.boolean  "work_public",       :default => true
-    t.text     "explanation"
   end
 
   add_index "homework_commons", ["course_id", "id"], :name => "index_homework_commons_on_course_id_and_id"
@@ -1501,11 +1419,10 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.integer  "no_anon_penalty",        :default => 1
     t.integer  "appeal_penalty",         :default => 0
     t.integer  "ta_mode",                :default => 1
+    t.datetime "appeal_time"
     t.float    "te_proportion",          :default => 1.0
     t.boolean  "final_mode",             :default => false
-    t.datetime "appeal_time"
     t.boolean  "answer_open_evaluation", :default => false
-    t.boolean  "shixun_evaluation",      :default => false
   end
 
   create_table "homework_detail_programings", :force => true do |t|
@@ -1569,19 +1486,6 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.datetime "updated_at",         :null => false
   end
 
-  create_table "ii", :force => true do |t|
-    t.integer  "project_id"
-    t.string   "author_login"
-    t.string   "rep_identifier"
-    t.datetime "created_at",                    :null => false
-    t.datetime "updated_at",                    :null => false
-    t.integer  "sonar_version",  :default => 0
-    t.string   "path"
-    t.string   "branch"
-    t.string   "language"
-    t.string   "sonar_name"
-  end
-
   create_table "import_students", :force => true do |t|
     t.string   "name"
     t.string   "student_number"
@@ -1808,6 +1712,7 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.integer  "course_id",         :default => -1
     t.integer  "course_group_id",   :default => 0
     t.integer  "is_collect",        :default => 1
+    t.integer  "import_student_id"
   end
 
   add_index "members", ["course_id"], :name => "index_members_on_course_id"
@@ -1829,20 +1734,19 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
   add_index "memo_messages", ["user_id", "forum_id", "created_at"], :name => "index_memo_messages_on_user_id_and_forum_id_and_created_at"
 
   create_table "memos", :force => true do |t|
-    t.integer  "forum_id",                                               :null => false
+    t.integer  "forum_id",                         :null => false
     t.integer  "parent_id"
-    t.string   "subject",                                                :null => false
-    t.text     "content",       :limit => 2147483647,                    :null => false
-    t.integer  "author_id",                                              :null => false
-    t.integer  "replies_count",                       :default => 0
+    t.string   "subject",                          :null => false
+    t.text     "content",                          :null => false
+    t.integer  "author_id",                        :null => false
+    t.integer  "replies_count", :default => 0
     t.integer  "last_reply_id"
-    t.boolean  "lock",                                :default => false
-    t.boolean  "sticky",                              :default => false
-    t.datetime "created_at",                                             :null => false
-    t.datetime "updated_at",                                             :null => false
-    t.integer  "viewed_count",                        :default => 0
+    t.boolean  "lock",          :default => false
+    t.boolean  "sticky",        :default => false
+    t.datetime "created_at",                       :null => false
+    t.datetime "updated_at",                       :null => false
+    t.integer  "viewed_count",  :default => 0
     t.integer  "root_id"
-    t.integer  "reward"
   end
 
   add_index "memos", ["root_id"], :name => "index_memos_on_root_id"
@@ -1859,22 +1763,22 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
   add_index "message_alls", ["user_id", "message_id", "created_at"], :name => "index_message_alls_on_user_id_and_message_id_and_created_at"
 
   create_table "messages", :force => true do |t|
-    t.integer  "board_id",                                               :null => false
+    t.integer  "board_id",                         :null => false
     t.integer  "parent_id"
-    t.string   "subject",                             :default => "",    :null => false
-    t.text     "content",       :limit => 2147483647
+    t.string   "subject",       :default => "",    :null => false
+    t.text     "content"
     t.integer  "author_id"
-    t.integer  "replies_count",                       :default => 0,     :null => false
+    t.integer  "replies_count", :default => 0,     :null => false
     t.integer  "last_reply_id"
-    t.datetime "created_on",                                             :null => false
-    t.datetime "updated_on",                                             :null => false
-    t.boolean  "locked",                              :default => false
-    t.integer  "sticky",                              :default => 0
+    t.datetime "created_on",                       :null => false
+    t.datetime "updated_on",                       :null => false
+    t.boolean  "locked",        :default => false
+    t.integer  "sticky",        :default => 0
     t.integer  "reply_id"
     t.integer  "quotes"
-    t.integer  "status",                              :default => 0
+    t.integer  "status",        :default => 0
     t.integer  "root_id"
-    t.integer  "visits",                              :default => 0
+    t.integer  "visits",        :default => 0
   end
 
   add_index "messages", ["author_id"], :name => "index_messages_on_author_id"
@@ -1932,21 +1836,6 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
   add_index "mirror_update_records", ["mirror_repository_id"], :name => "index_mirror_update_records_on_mirror_repository_id"
   add_index "mirror_update_records", ["user_id"], :name => "index_mirror_update_records_on_user_id"
 
-  create_table "mul_tests", :force => true do |t|
-    t.integer  "container_id"
-    t.string   "container_type"
-    t.string   "action"
-    t.integer  "time"
-    t.integer  "status",         :default => 0
-    t.datetime "created_at",                    :null => false
-    t.datetime "updated_at",                    :null => false
-    t.string   "language"
-    t.integer  "num"
-    t.string   "indentifier"
-    t.string   "name"
-    t.integer  "shixun_id"
-  end
-
   create_table "myshixun_members", :force => true do |t|
     t.integer  "myshixun_id"
     t.integer  "user_id"
@@ -1963,18 +1852,13 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.integer  "user_id"
     t.integer  "gpid"
     t.integer  "visits",      :default => 0
-    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  "status",      :default => 0
     t.string   "identifier"
     t.string   "commit_id"
-    t.datetime "modify_time"
-    t.datetime "reset_time"
-    t.boolean  "system_tip",  :default => false
   end
 
-  add_index "myshixuns", ["user_id", "shixun_id"], :name => "index_myshixuns_on_user_id_and_shixun_id", :unique => true
-
   create_table "news", :force => true do |t|
     t.integer  "project_id"
     t.string   "title",           :limit => 60, :default => "", :null => false
@@ -2215,11 +2099,8 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
   create_table "poll_users", :force => true do |t|
     t.integer  "user_id"
     t.integer  "poll_id"
-    t.datetime "created_at",                   :null => false
-    t.datetime "updated_at",                   :null => false
-    t.integer  "commit_status", :default => 0
-    t.datetime "start_at"
-    t.datetime "end_at"
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
   end
 
   create_table "poll_votes", :force => true do |t|
@@ -2234,20 +2115,24 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
   create_table "polls", :force => true do |t|
     t.string   "polls_name"
     t.string   "polls_type"
-    t.integer  "course_id"
+    t.integer  "polls_group_id"
     t.integer  "polls_status"
     t.integer  "user_id"
-    t.datetime "publish_time"
-    t.datetime "end_time"
-    t.datetime "created_at",                           :null => false
-    t.datetime "updated_at",                           :null => false
+    t.datetime "published_at"
+    t.datetime "closed_at"
+    t.datetime "created_at",                       :null => false
+    t.datetime "updated_at",                       :null => false
     t.text     "polls_description"
     t.integer  "show_result",       :default => 1
-    t.integer  "exercise_bank_id"
-    t.boolean  "is_public",         :default => false
   end
 
-  add_index "polls", ["course_id"], :name => "index_polls_on_course_id"
+  create_table "pr_paths", :force => true do |t|
+    t.integer  "project_id"
+    t.integer  "gitlab_project_id"
+    t.string   "path"
+    t.datetime "created_at",        :null => false
+    t.datetime "updated_at",        :null => false
+  end
 
   create_table "praise_tread_caches", :force => true do |t|
     t.integer  "object_id",   :null => false
@@ -2409,18 +2294,6 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
   add_index "queries", ["project_id"], :name => "index_queries_on_project_id"
   add_index "queries", ["user_id"], :name => "index_queries_on_user_id"
 
-  create_table "question_banks", :force => true do |t|
-    t.text     "name"
-    t.integer  "container_id"
-    t.string   "container_type"
-    t.integer  "quotes"
-    t.integer  "user_id"
-    t.boolean  "is_public"
-    t.integer  "course_list_id"
-    t.datetime "created_at",     :null => false
-    t.datetime "updated_at",     :null => false
-  end
-
   create_table "reference_materials", :force => true do |t|
     t.string   "book"
     t.string   "editor"
@@ -2492,6 +2365,15 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
 
   add_index "repositories", ["project_id"], :name => "index_repositories_on_project_id"
 
+  create_table "repository_paths", :force => true do |t|
+    t.string   "path"
+    t.integer  "myshixun_id"
+    t.integer  "user_id"
+    t.integer  "status"
+    t.datetime "created_at",  :null => false
+    t.datetime "updated_at",  :null => false
+  end
+
   create_table "resource_banks", :force => true do |t|
     t.integer  "course_id"
     t.integer  "attachment_id"
@@ -2551,7 +2433,6 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.string   "city"
     t.string   "address"
     t.boolean  "auto_users_trial", :default => false
-    t.string   "shool_code"
   end
 
   create_table "secdomains", :force => true do |t|
@@ -2676,10 +2557,12 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.integer  "changeset_num"
     t.integer  "status",                               :default => 0
     t.string   "language"
-    t.boolean  "authentication",                       :default => false
     t.string   "identifier"
+    t.boolean  "authentication",                       :default => false
     t.integer  "myshixun_count",                       :default => 0
+    t.string   "exec_path"
     t.text     "propaedeutics",  :limit => 2147483647
+    t.integer  "is_updated",                           :default => 0
     t.boolean  "webssh",                               :default => false
     t.integer  "trainee",                              :default => 1
     t.integer  "major_id"
@@ -2687,9 +2570,6 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.boolean  "hidden",                               :default => false
     t.integer  "fork_from"
     t.boolean  "can_copy",                             :default => false
-    t.datetime "modify_time"
-    t.datetime "reset_time"
-    t.datetime "publish_time"
   end
 
   create_table "softapplications", :force => true do |t|
@@ -2767,6 +2647,7 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.datetime "updated_at",                                   :null => false
     t.integer  "main_category_id"
     t.integer  "sub_category_id"
+    t.integer  "size",                          :default => 0
   end
 
   create_table "student_work_projects", :force => true do |t|
@@ -2823,7 +2704,6 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.text     "late_reason"
     t.integer  "group_id",                                      :default => 0
     t.integer  "myshixun_id"
-    t.datetime "update_time"
   end
 
   add_index "student_works", ["homework_common_id", "user_id"], :name => "index_student_works_on_homework_common_id_and_user_id"
@@ -3025,19 +2905,15 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.integer  "position"
   end
 
-  create_table "tidings", :force => true do |t|
+  create_table "tests", :force => true do |t|
     t.integer  "user_id"
-    t.integer  "trigger_user_id"
-    t.integer  "container_id"
-    t.string   "container_type"
-    t.integer  "parent_container_id"
-    t.string   "parent_container_type"
-    t.integer  "belong_container_id"
-    t.string   "belong_container_type"
-    t.integer  "status"
-    t.boolean  "viewed"
-    t.datetime "created_at",            :null => false
-    t.datetime "updated_at",            :null => false
+    t.string   "username"
+    t.integer  "change_id"
+    t.string   "pr_path"
+    t.integer  "project_id"
+    t.integer  "gpid"
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
   end
 
   create_table "time_entries", :force => true do |t|
@@ -3088,7 +2964,7 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.datetime "updated_at",                              :null => false
     t.integer  "author_id"
     t.integer  "status",      :limit => 1, :default => 0
-    t.integer  "position",    :limit => 1, :default => 0
+    t.integer  "position",    :limit => 1
     t.integer  "result",                   :default => 0
   end
 
@@ -3274,6 +3150,37 @@ ActiveRecord::Schema.define(:version => 20180207065530) do
     t.integer "authentication_id"
   end
 
+  create_table "users_copy", :force => true do |t|
+    t.string   "login",                           :default => "",    :null => false
+    t.string   "hashed_password",   :limit => 40, :default => "",    :null => false
+    t.string   "firstname",         :limit => 30, :default => "",    :null => false
+    t.string   "lastname",                        :default => "",    :null => false
+    t.string   "mail",              :limit => 60, :default => "",    :null => false
+    t.boolean  "admin",                           :default => false, :null => false
+    t.integer  "status",                          :default => 1,     :null => false
+    t.datetime "last_login_on"
+    t.string   "language",          :limit => 5,  :default => ""
+    t.integer  "auth_source_id"
+    t.datetime "created_on"
+    t.datetime "updated_on"
+    t.string   "type"
+    t.string   "identity_url"
+    t.string   "mail_notification",               :default => "",    :null => false
+    t.string   "salt",              :limit => 64
+    t.integer  "gid"
+    t.integer  "visits",                          :default => 0
+    t.integer  "excellent_teacher",               :default => 0
+    t.integer  "excellent_student",               :default => 0
+    t.string   "phone"
+    t.boolean  "authentication",                  :default => false
+    t.integer  "grade"
+    t.integer  "experience",                      :default => 0
+  end
+
+  add_index "users_copy", ["auth_source_id"], :name => "index_users_on_auth_source_id"
+  add_index "users_copy", ["id", "type"], :name => "index_users_on_id_and_type"
+  add_index "users_copy", ["type"], :name => "index_users_on_type"
+
   create_table "verification_codes", :force => true do |t|
     t.string   "code"
     t.integer  "code_type"