Brian Candler wrote:

> It is a special case: when the last argument to a method call is a hash, 
> then you can omit the outer braces.


the hash options I saw in atom_feed , but it doesn't the last argument.


==============================================================
 def atom_feed(options = {}, &block)
 95:         if options[:schema_date]
 96:           options[:schema_date] = 
options[:schema_date].strftime("%Y-%m-%d") if 
options[:schema_date].respond_to?(:strftime)
 97:         else
 98:           options[:schema_date] = "2005" # The Atom spec copyright 
date
 99:         end
100:
101:         xml = options[:xml] || eval("xml", block.binding)
102:         xml.instruct!
103:         if options[:instruct]
104:           options[:instruct].each do |target,attrs|
105:             if attrs.respond_to?(:keys)
106:               xml.instruct!(target, attrs)
107:             elsif attrs.respond_to?(:each)
108:               attrs.each { |attr_group| xml.instruct!(target, 
attr_group) }
109:             end
110:           end
111:         end
112:
113:         feed_opts = {"xml:lang" => options[:language] || "en-US", 
"xmlns" => 'http://www.w3.org/2005/Atom'}
114:         feed_opts.merge!(options).reject!{|k,v| 
!k.to_s.match(/^xml/)}
115:
116:         xml.feed(feed_opts) do
117:           xml.id(options[:id] || 
"tag:#{request.host},#{options[:schema_date]}:#{request.request_uri.split(".")[0]}")
118:           xml.link(:rel => 'alternate', :type => 'text/html', :href 
=> options[:root_url] || (request.protocol + request.host_with_port))
119:           xml.link(:rel => 'self', :type => 'application/atom+xml', 
:href => options[:url] || request.url)
120:
121:           yield AtomFeedBuilder.new(xml, self, options)
122:         end
123:       end

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