cotroller修改

app/controllers/discuss_demos_controller.rb

@@ -1,5 +1,6 @@
 class DiscussDemosController < ApplicationController
   def index
+
     @discuss_demo_list = DiscussDemo.where("body is not null").order("created_at desc").page(params[:page] || 1).per(10)
   end
 
@@ -24,7 +25,7 @@ class DiscussDemosController < ApplicationController
   end
 
   def destroy
-    DiscussDemo.delete_all(["id = ?",params[:id]])
+    DiscussDemo.destroy(params[:id])
     redirect_to :controller=> 'discuss_demos',:action => 'index'
   end