删除空数据

db/migrate/20160513120002_delete_empty_apply_homework.rb

@@ -0,0 +1,18 @@
+class DeleteEmptyApplyHomework < ActiveRecord::Migration
+  def up
+    count = ApplyHomework.all.count / 30 + 2
+    transaction do
+      for i in 1 ... count do i
+        ApplyHomework.page(i).per(30).each do |ah|
+          homework = HomeworkCommon.find ah.homework_common_id
+          if homework.nil?
+            ah.destroy
+          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 => 20160511055221) do
+ActiveRecord::Schema.define(:version => 20160513120002) do
 
   create_table "activities", :force => true do |t|
     t.integer  "act_id",                                  :null => false
@@ -1107,6 +1107,23 @@ ActiveRecord::Schema.define(:version => 20160511055221) do
     t.integer  "viewed_count",  :default => 0
   end
 
+  create_table "mess", :id => false, :force => true do |t|
+    t.string   "课程名"
+    t.integer  "课程ID",                    :default => 0,  :null => false
+    t.string   "教师姓",                     :default => "", :null => false
+    t.string   "教师名",       :limit => 30, :default => "", :null => false
+    t.string   "主贴名",                     :default => "", :null => false
+    t.integer  "主贴或回帖ID",                 :default => 0,  :null => false
+    t.integer  "回帖对应主贴ID"
+    t.integer  "帖子点赞数"
+    t.integer  "主贴回复数",                   :default => 0,  :null => false
+    t.text     "主贴或回帖内容"
+    t.datetime "发帖时间",                                    :null => false
+    t.integer  "发帖或回帖用户ID",               :default => 0,  :null => false
+    t.string   "发帖或回帖用户姓",                :default => "", :null => false
+    t.string   "发帖或回帖用户名",  :limit => 30, :default => "", :null => false
+  end
+
   create_table "message_alls", :force => true do |t|
     t.integer  "user_id"
     t.integer  "message_id"
@@ -1328,6 +1345,7 @@ ActiveRecord::Schema.define(:version => 20160511055221) do
     t.boolean  "allow_guest_download", :default => true
     t.integer  "visits",               :default => 0
     t.integer  "show_mode",            :default => 0
+    t.integer  "allow_teacher",        :default => 0
   end
 
   create_table "phone_app_versions", :force => true do |t|
@@ -2043,6 +2061,7 @@ ActiveRecord::Schema.define(:version => 20160511055221) do
     t.string   "salt",              :limit => 64
     t.integer  "gid"
     t.integer  "visits",                          :default => 0
+    t.integer  "excellent_teacher",               :default => 0
   end
 
   add_index "users", ["auth_source_id"], :name => "index_users_on_auth_source_id"