From: "Ara.T.Howard" <Ara.T.Howard@...>
Date: 2005-05-12T02:25:27+09:00
Subject: defining a custom to_yaml method to inline hashes




check out the following:


   jib:~ > cat a.rb
   require 'yaml'

   # yaml can load inline hashes
   inline_hash = YAML::load "--- { jid: 121, metric: started, time: 2005-05-10 08:18:22.523016 }"

   puts '=' * 8
   y inline_hash
   puts


   # attempt to bludgeon to object into emitting in an inline fashion
   class << inline_hash
     def to_yaml(*a, &b)
       '{ ' << map{|kv| kv.join(': ')}.join(', ') << ' }'
     end
   end

   # looks good at first
   puts '=' * 8
   y inline_hash
   puts

   # but doesn't really work after all when part of another object
   puts '=' * 8
   y({'running' => inline_hash})
   puts


   jib:~ > ruby a.rb
   ========
   ---
   time: 2005-05-10 08:18:22.523016
   jid: 121
   metric: started

   ========
   { time: 2005-05-10 08:18:22.523016, jid: 121, metric: started }

   ========
   ---
   running:


notice the second block is alright but the third is not.  i know i need to do
something like

   def to_yaml(*a, &b)
     YAML::quick_emit(*a, &b) do |out|
       # now what?
     end
   end


but can't seem to find anything in the docs or samples.

cheers.

-a
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