课程动态的数据迁移

db/migrate/20150925025200_alter_activities.rb

@@ -0,0 +1,53 @@
+class AlterActivities < ActiveRecord::Migration
+  def up
+    UserActivity.all.each do |activity|
+      if activity.act_type == 'JournalsForMessage'
+        if activity.act
+          unless activity.act.m_parent_id.nil?
+            parent_act = UserActivity.where("act_id = #{activity.act.parent.id} and act_type='JournalsForMessage' and container_type='Course'").first
+            if parent_act
+              parent_act.created_at = activity.act.parent.children.maximum("created_on")
+              parent_act.save
+              activity.destroy
+            end
+          end
+        else
+          activity.destroy
+        end
+      end
+    end
+
+      CourseActivity.all.each do |activity|
+        if activity.course_act_type == 'JournalsForMessage'
+          if activity.course_act
+            unless activity.course_act.m_parent_id.nil?
+              parent_act = CourseActivity.where("course_act_id = #{activity.course_act.parent.id} and course_act_type='JournalsForMessage'").first
+              if parent_act
+                parent_act.created_at = activity.course_act.parent.children.maximum("created_on")
+                parent_act.save
+                activity.destroy
+              end
+            end
+          else
+            activity.destroy
+          end
+        elsif activity.course_act_type == 'Message'
+          if activity.course_act
+            unless activity.course_act.parent_id.nil?
+              parent_act = CourseActivity.where("course_act_id = #{activity.course_act.parent.id} and course_act_type='Message'").first
+              if parent_act
+                parent_act.created_at = activity.course_act.parent.children.maximum("created_on")
+                parent_act.save
+                activity.destroy
+              end
+            end
+          else
+            activity.destroy
+          end
+        end
+      end
+  end
+
+  def down
+  end
+end

db/migrate/20150925060939_update_course_activities_updated_at.rb

@@ -0,0 +1,16 @@
+class UpdateCourseActivitiesUpdatedAt < ActiveRecord::Migration
+  def up
+    count = CourseActivity.all.count / 30 + 2
+    transaction do
+      for i in 1 ... count do i
+      CourseActivity.page(i).per(30).each do |activity|
+        activity.updated_at = activity.created_at
+        activity.save
+      end
+      end
+    end
+  end
+
+  def down
+  end
+end