迁移总表时间

app/models/course_message.rb

@@ -11,7 +11,7 @@ class CourseMessage < ActiveRecord::Base
   validates :course_id,presence: true
   validates :course_message_id,presence: true
   validates :course_message_type, presence: true
-  validates :content, length: {maximum: 1000}
+  validates_length_of :content, :maximum => 100
   after_create :add_user_message
 
   def add_user_message

db/migrate/20150829023459_forge_messages.rb

@@ -76,6 +76,5 @@ class ForgeMessages < ActiveRecord::Migration
   end
 
   def down
-    ForgeMessages.destroy_all
   end
 end

db/migrate/20150829070453_about_message_alls.rb

@@ -1,31 +0,0 @@
-class AboutMessageAlls < ActiveRecord::Migration
-  def up
-    forge_count = ForgeMessage.all.count / 30 + 2
-    transaction do
-      for i in 1 ... forge_count do i
-      ForgeMessage.page(i).per(30).each do |forge_message|
-        message = MessageAll.new
-        message.message_id = forge_message.forge_message_id
-        message.message_type = forge_message.forge_message_type
-        message.user_id = forge_message.user_id
-        message.save
-      end
-      end
-    end
-
-    course_count = CourseMessage.all.count / 30 + 2
-    transaction do
-      for i in 1 ... course_count do i
-      CourseMessage.page(i).per(30).each do |course_message|
-        message = MessageAll.new
-        message.message_id = course_message.course_message_id
-        message.message_type = course_message.course_message_type
-        message.save
-      end
-      end
-    end
-  end
-
-  def down
-  end
-end

db/migrate/20150829081822_update_message_time.rb

@@ -0,0 +1,46 @@
+class UpdateMessageTime < ActiveRecord::Migration
+  def up
+    course_count = CourseMessage.all.count / 30 + 1
+    transaction do
+      for i in 1 ... course_count do i
+      CourseMessage.page(i).per(30).each do |cmessage|
+        if cmessage.course_message
+          if cmessage.course_message.respond_to?("created_at")
+            cmessage.created_at = cmessage.course_message.created_at
+          elsif cmessage.course_message.respond_to?("created_on")
+            cmessage.created_at = cmessage.course_message.created_on
+          end
+          cmessage.save
+
+          course_all_message = MessageAll.where("message_type = '#{cmessage.class.to_s}' and message_id = '#{cmessage.id}'").first
+          course_all_message.created_at = cmessage.created_at
+          course_all_message.save
+        end
+      end
+      end
+    end
+
+    forge_count = ForgeMessage.all.count / 30 + 2
+    transaction do
+      for i in 1 ... forge_count do i
+      ForgeMessage.page(i).per(30).each do |fmessage|
+        if fmessage.forge_message
+          if fmessage.forge_message.respond_to?("created_at")
+            fmessage.created_at = fmessage.forge_message.created_at
+          elsif fmessage.forge_message.respond_to?("created_on")
+            fmessage.created_at = fmessage.forge_message.created_on
+          end
+          fmessage.save
+
+          forge_all_message = MessageAll.where("message_type = '#{fmessage.class.to_s}' and message_id = '#{fmessage.id}'").first
+          forge_all_message.created_at = fmessage.created_at
+          forge_all_message.save
+        end
+      end
+      end
+    end
+  end
+
+  def down
+  end
+end