cotroller修改：删除记录的同时删除对应的文件

app/controllers/discuss_demos_controller.rb

@@ -25,6 +25,11 @@ class DiscussDemosController < ApplicationController
   end
 
   def destroy
+    asset = Kindeditor::Asset.find_by_owner_id(params[:id])
+    filepath = File.join(Rails.root,"public","files","uploads",
+                         asset[:created_at].to_s.gsub("+0800","").to_datetime.strftime("%Y%m").to_s,
+                         asset[:asset].to_s)
+    File.delete(filepath) if File.exist?filepath
     DiscussDemo.destroy(params[:id])
     redirect_to :controller=> 'discuss_demos',:action => 'index'
   end