Grouping controllers into modules

i have grouping administration controllers into module (admin) for
maintaining more order and logical structure.
then i have modified class controller:

class Admin::LocationsController < ApplicationController


i have created in views the directory “admin” and put the directory
“locations” into this.

i have setting the routes.rb:

map.namespace :admin do |admin|
admin.resources :locations

but i can’t access to CRUD pages

i don’t know the right sintax for modifing the link_to helper
help me