为activities表添加created_at字段，并导入数据

config/locales/projects/en.yml

@@ -42,10 +42,10 @@ en:
   
   label_member: "Members"
   project_module_attachments: "Resources"
-   label_project_mail_attachments: Project Resources
+  label_project_mail_attachments: "Project Resources"
-    label_project_mail_upload: had uploaded project resources
+  label_project_mail_upload: "had uploaded project resources"
 
-  label_invite: Invitation
+  label_invite: "Invitation"
   label_invite_new_user: "Send email to invite new user"
   label_invite_trustie_user: "Invite the Trustie registered user"
 

db/migrate/20150810064247_add_created_at_to_activities.rb

@@ -0,0 +1,8 @@
+class AddCreatedAtToActivities < ActiveRecord::Migration
+  def up
+  	add_column :activities, :created_at, :timestamp
+  end
+  def end
+  	remove_column :activities, :created_at	
+  end
+end

db/migrate/20150811010817_update_activities_data.rb

@@ -0,0 +1,21 @@
+class UpdateActivitiesData < ActiveRecord::Migration
+  def up 	
+  	count = Activity.all.count / 10 + 1
+    transaction do
+      for i in 1 ... count do i
+        Activity.all.each do |activity|
+          type = activity.act_type
+          if type=='Contest' || type=='Message' || type=='News'|| type=='Journal'|| type=='Issue'|| type=='Principal'||type=='JournalsForMessage'
+            activity.created_at = activity.act.created_on if activity.act
+          elsif type=='Contestnotification' || type=='HomeworkCommon' || type=='Poll'
+            activity.created_at = activity.act.created_at if activity.act
+          end
+          activity.save
+	  	  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 => 20150801034945) do
+ActiveRecord::Schema.define(:version => 20150810064247) do
 
   create_table "activities", :force => true do |t|
     t.integer  "act_id",                                  :null => false
@@ -19,6 +19,7 @@ ActiveRecord::Schema.define(:version => 20150801034945) do
     t.integer  "user_id",                                 :null => false
     t.integer  "activity_container_id"
     t.string   "activity_container_type", :default => ""
+    t.datetime "created_at"
   end
 
   add_index "activities", ["act_id", "act_type"], :name => "index_activities_on_act_id_and_act_type"
@@ -454,13 +455,6 @@ ActiveRecord::Schema.define(:version => 20150801034945) 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
@@ -863,6 +857,7 @@ ActiveRecord::Schema.define(:version => 20150801034945) 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"