ruby noob:/usr/lib/ruby/1.8/rss/rss.rb:922:in“有没有需要的元素?”:未定义的方法

抱歉,这可能是一个基本的/愚蠢的/noob问题-我只是在尝试修改现有的Ruby脚本-它在我的Mac上运行,但是没有在Ubuntu9.04上运行。

错误是:

/usr/lib/ruby/1.8/rss/rss.rb:922:in `have_required_elements?': undefined method `have_required_elements?' for "App Store Reviews for ":String (NoMethodError)
    from /usr/lib/ruby/1.8/rss/maker/base.rb:188:in `any?'
    from /usr/lib/ruby/1.8/rss/rss.rb:922:in `each'
    from /usr/lib/ruby/1.8/rss/rss.rb:922:in `any?'
    from /usr/lib/ruby/1.8/rss/rss.rb:922:in `have_required_elements?'
    from /usr/lib/ruby/1.8/rss/maker/base.rb:188:in `all?'
    from /usr/lib/ruby/1.8/rss/rss.rb:917:in `each'
    from /usr/lib/ruby/1.8/rss/rss.rb:917:in `all?'
    from /usr/lib/ruby/1.8/rss/rss.rb:917:in `have_required_elements?'
    from /usr/lib/ruby/1.8/rss/rss.rb:962:in `tag'
    from /usr/lib/ruby/1.8/rss/rss.rb:884:in `to_s'
    from /usr/lib/ruby/1.8/rss/rss.rb:924:in `have_required_elements?'
    from /usr/lib/ruby/1.8/rss/maker/base.rb:188:in `all?'
    from /usr/lib/ruby/1.8/rss/rss.rb:917:in `each'
    from /usr/lib/ruby/1.8/rss/rss.rb:917:in `all?'
    from /usr/lib/ruby/1.8/rss/rss.rb:917:in `have_required_elements?'
    from /usr/lib/ruby/1.8/rss/rss.rb:962:in `tag'
    from /usr/lib/ruby/1.8/rss/rss.rb:1284:in `tag'
    from /usr/lib/ruby/1.8/rss/rss.rb:884:in `to_s'
    from ./appstore_reviews:215:in `write'
    from ./appstore_reviews:215
    from ./appstore_reviews:214:in `open'
    from ./appstore_reviews:214

它使用Ruby的rss位并试图写出rss文件。文件写入行出错:

...
version = "2.0"
destination = "appreviews_"+ARGV[0]+".xml"
puts destination
content = RSS::Maker.make(version) do |m|
m.items.do_sort = true

# a simple command-line presentation
software.keys.sort.each do |software_key|

m.channel.title = "App Store Reviews for ",software_key
m.channel.link = "http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=",ARGV[1],"&mt=8" # need to put in link to itunes
m.channel.description = "App Store Reviews for ",software_key
...

File.open(destination,"w") do |f|
f.write(content)
end

这是基于iPhone应用程序审查欺诈代码: link text

加入一些基本的RSS提要 link text

提前感谢您提供任何提示/建议。 克里斯