Rails 3：在Rails中使用JSON响应REST-ful *** 作的正确方法是什么？

Rails 3：在Rails中使用JSON响应REST-ful *** 作的正确方法是什么？

#config/routes.rbMyApplicationsName::Application.routes.draw do  resources :articlesend#app/controllers/articles_controller.rbclass ArticlesController < ActionController::base  # so that respond_with knows which formats are  # allowed in each of the individual actions  respond_to :json  def index    @articles = Article.all    respond_with @articles  end  def show    @article = Article.find(params[:id])    respond_with @article  end  ...  def update    @article = Article.find(params[:id])    @article.update_attributes(params[:article])    # respond_with will automatically check @article.valid?    # and respond appropriately ... @article.valid? will    # be set based on whether @article.update_attributes    # succeeded past all the validations    # if @article.valid? then respond_with will redirect to    # to the show page; if !@article.valid? then respond_with    # will show the :edit view, including @article.errors    respond_with @article  end  ...end