Rails宝典八十七式: 生成RSS feeds

看看Rails2.0生成RSS feeds有多简单:
routes.rb:

map.resources :articles

app/controllers/articles_controller.rb:

def index
  @articles = Article.find(:all)
end

app/views/index.html.erb:

<%= link_to "RSS Feed", formatted_articles_url(:rss) %>

app/views/index.rss.builder:

xml.instruct! :xml, :version => "1.0" 
xml.rss :version => "2.0" do
  xml.channel do
    xml.title "Articles"
    xml.description "Lots of articles"
    xml.link formatted_articles_url(:rss)

    for article in @articles
      xml.item do
        xml.title article.name
        xml.description article.content
        xml.pubDate article.created_at.to_s(:rfc822)
        xml.link formatted_article_url(article, :rss)
        xml.guid formatted_article_url(article, :rss)
      end
    end
  end
end

Rails 2.0还提供一个rake任务来查看由routes.rb生成的named routes:

rake routes