From: Simon Chiang <redmine@...>
Date: 2009-03-30T12:53:37+09:00
Subject: [ruby-core:23062] [Bug #1331] YAML misformats hash with ruby object as key

Bug #1331: YAML misformats hash with ruby object as key
http://redmine.ruby-lang.org/issues/show/1331

Author: Simon Chiang
Status: Open, Priority: Normal
ruby -v: ruby 1.8.6 (2008-03-03 patchlevel 114) [universal-darwin9.0]

YAML misformats the dump of hashes where the key is a user-defined ruby object.  For instance:

  class A; end
  YAML.dump({A.new => :a})

Produces:
 
  --- 
  !ruby/object:A ? {}
  : :a

Which cannot be reloaded as YAML because the question mark is in the wrong place.  The correctly formatted YAML is:

  --- 
  ? !ruby/object:A {}
  : :a

I have attached a couple tests with a patch illustrating how to work around this problem using gsub.  Obviously a string substitution is not a long term solution, but I hope it illustrates what needs to be fixed.


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