在网上Google了很多次,能找到用rails制作rss,但是总是找不到完整的。今天把完整的过程抄录在这里:

方法A:

就是你自己把RSS XML的格式拼凑好,输出.并设置HTTP Header ，标记content-type为application/XML,常见的代码:

#Post_controller::feed()
          def feed
                                                require "rss"
                                                articles = Article.find :all, :order => 'post_date DESC', :limit => 10
                                                feed = RSS::Maker.make("2.0") do |maker|
                                                        maker.channel.title = "Gang of Technology"
                                                        maker.channel.description = "Gang of Technology site"
                                                        maker.channel.link = "http://up-u.com"
                                
                                                        maker.items.do_sort = true
                                
                                                        articles.each do |article|
                                                                item = maker.items.new_item
                                                                item.link = "http://www.***.com/archives/#{article.id}"
                                                                item.title = article.title
                                                                item.date = article.post_date
                                                                item.description = ""
                                                        end
                                                end
                                                send_data feed.to_s, :type => "application/rss+xml", :disposition =>
                                'inline'
    end

方法B:

Rails Controller->Action 代码:

#Post_controller::feed
def feed
@posts=Post.find :all,:limit=>”id desc”
end

erb模板:

xml.instruct!
xml.rss(”version”=>”2.0″,
“xmlns:dc”=>”http://purl.org/dc/elements/1.1/”) do
xml.channel do
xml.title “renlu.xu ’s blog”
xml.link(url_for(:action=>”start”,:only_path=>false))
xml.description “My life My love”
xml.language “zh_CN”
xml.ttl 60

for event in @posts do
xml.item do
xml.title(event.title)
xml.description(event.body)
xml.pubDate(event.created_at.to_s(:rfc822))
xml.guid(event.id)
xml.link(”http://…..#{event.id}”)
end
end
end
end

这种方法 网上很多文章到这一步就算完了，没有下文了，其实不对。到这一步，访问http://localhost:3000/post/feed仍然是出来的html的界面。g之，找到介绍:rails 2.0会根据不同的格式对模板进行渲染。这段代码放在/views/post/feed.rhtml中是没有用的，需要放在/views/post/feed.atom.builder中，并且需要通过http://localhost:3000/post/feed/123.atom(这里123没有什么实际意义 随便抓的一个),或是http://localhost:3000/post/feed?format=atom才能正确地按rss+xml输出。

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