Rails Restfull API/Rails json/xml api

In Controllers => api => V1
create "users_controllers.rb"
the code inside this controller may seems something like following
class Api::V1::HotelsController < ApplicationController
  def show
  @user = user.find( params[:id] )
  respond_to do |format|
        format.json {render :json => @user}
        format.xml {render :xml => @user}
    end
 end
end
_____
Now go to routes and Add the following
namespace :api do
    namespace :v1 do
      resources :users       
    end
   end
____________
now run $ rake routes | grep users
and check the path against the show method. this will seem something like following.
"/api/v1/users/:id"
---
Now hit http://localhost:3000/api/v1/users/(any ID like 1,2 or 3).json