1.组织管理员有删除帖子的权限；2.删除帖子后更新org_activities表

app/controllers/messages_controller.rb

@@ -281,8 +281,10 @@ class MessagesController < ApplicationController
   def destroy
     if @project
       (render_403; return false) unless @message.destroyable_by?(User.current)
-    else
+    elsif @course
       (render_403; return false) unless @message.course_destroyable_by?(User.current)
+    else
+      (render_403; return false) unless @message.org_subfield_editable_by?(User.current)
     end
     r = @message.to_param
     @message.destroy

app/models/message.rb

@@ -44,6 +44,8 @@ class Message < ActiveRecord::Base
 
   has_many :ActivityNotifies,:as => :activity, :dependent => :destroy
 
+  after_destroy :delete_org_activities
+
   acts_as_searchable :columns => ['subject', 'content'],
                      :include => {:board => :project},
                      :project_key => "#{Board.table_name}.project_id",
@@ -316,4 +318,8 @@ class Message < ActiveRecord::Base
       end
     end
   end
+
+  def delete_org_activities
+    OrgActivity.where("org_act_type='Message' and org_act_id =#{self.id} and container_type='OrgSubfield'").destroy_all
+  end
 end