最新动态按创建时间排序

app/controllers/organizations_controller.rb

@@ -107,7 +107,7 @@ class OrganizationsController < ApplicationController
         if @organization.org_subfields.where(:field_type => "Compact", :hide => 0).count > 0
           @acts = UserActivity.find_by_sql("SELECT * FROM `user_activities` where act_type in ('HomeworkCommon', 'News', 'Message', 'Issue') and
                                         ((container_type = 'Course' and container_id in (#{course_ids.join(',')})) or (container_type = 'Project' and container_id in (#{project_ids.join(',')})))
-                                        order by updated_at desc limit 6;")
+                                        order by created_at desc limit 6;")
         end
         render :layout => 'base_org_custom'
       else
@@ -273,7 +273,7 @@ class OrganizationsController < ApplicationController
     course_ids = (@organization.courses.map(&:id) - shield_course_ids) << 0
     @org_acts = UserActivity.find_by_sql("SELECT * FROM `user_activities` where act_type in ('HomeworkCommon', 'News', 'Message', 'Issue') and
                                         ((container_type = 'Course' and container_id in (#{course_ids.join(',')})) or (container_type = 'Project' and container_id in (#{project_ids.join(',')})))
-                                        order by updated_at desc limit 6;")
+                                        order by created_at desc limit 6;")
     respond_to do |format|
       format.html{render :layout => 'base_org_custom'}
       format.js

app/helpers/organizations_helper.rb

@@ -105,13 +105,13 @@ module OrganizationsHelper
   def org_time_by_type obj
     case obj.act_type
       when "Message"
-        obj.act.updated_on
+        obj.act.created_on
       when "News"
         obj.act.created_on
       when "HomeworkCommon"
-        obj.act.updated_at
+        obj.act.created_at
       when "Issue"
-        obj.act.updated_on
+        obj.act.created_on
     end
   end