添加路由

config/routes.rb

@@ -27,6 +27,9 @@
 
 RedmineApp::Application.routes.draw do
 
+  resources :discuss_demo
+  match '/discuss_demo/new',:to => 'discuss_demo#create',:via =>[:post]
+  #match '/discuss_demo/show',:to => 'discuss_demo#show'
   mount Mobile::API => '/api'
 
   resources :homework_users