使用Ruby / Rails在RSS feed中生成iTunes XML节点

Question

Q: How do I generate the XML nodes specific to iTunes using Ruby/Rails?

Trying to generate iTunes XML feed, eg (based off example ):

xml.instruct! :xml, :version => "1.0" 
xml.rss(:version => "2.0") do
  xml.channel do
    xml.title "Your Blog Title"
    xml.description "A blog about software and chocolate"
    xml.link posts_url

    @posts.each do |post|
      xml.item do
        xml.title post.title
        xml.description "Temporary post description"
        xml.pubDate post.created_at.to_s(:rfc822)
        xml.link post_url(post)
        xml.guid post_url(post)
      end
    end
  end
end

Which happily generates something like:

<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0">
  <channel>
    <title>Your Blog Title</title>
    <description>A blog about software and chocolate</description>
    <link>https://pubweb-thedanielmay.c9.io/sermons</link>
    <item>
       ... omitted ...
    </item>
  </channel>
</rss>

But looks like I need to generate iTunes-specific XML nodes (as per Working With iTunes , eg)

<?xml version="1.0" encoding="UTF-8"?>
<rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0"> <-- *
  <channel>
    <title>Your Blog Title </title>
    ... omitted ...
    <itunes:subtitle>A program about everything</itunes:subtitle> <-- *
... etc ...

Not sure how I generate the iTunes-specific nodes as they have colons in them.

Standard RSS nodes are like:

xml.item --> <item>

How do I get to generating nodes like:

• <rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0">
• <itunes:author>

Answer 1

Ah, answers as per code via Ryan Bates' awesome Railscasts RSS sample

xml.rss "xmlns:itunes" => "http://www.itunes.com/dtds/podcast-1.0.dtd", :version => "2.0"

and

xml.itunes :author, author