url_for(@list) #=> '/ruby-dev'

Author: amatsuda

app/models/list.rb

@@ -27,4 +27,12 @@ def find_by_id(id)
 
     alias find find_by_id
   end
+
+  def to_param
+    name
+  end
+
+  def persisted?
+    true
+  end
 end

config/routes.rb

@@ -1,6 +1,6 @@
 Rails.application.routes.draw do
   get '/:list_name/:list_seq', to: 'messages#show'
-  get '/:list_name/', to: 'messages#index'
+  get '/:list_name/', to: 'messages#index', as: :list
 
   get '/attachments/:encoded_key/*filename' => 'attachments#show', as: :attachment