From: Ivo Wever <wever@...>
Date: 2011-03-23T20:04:11+09:00
Subject: Workaround for ActiveSupport::OrderedHash YAML bug

Hi,

I'm looking for a workaround for the problem that you can't
roundtrip a Hash with OrderedHashes as keys. The simplest demonstration,
using Ruby Enterprise 2011.03 (1.8.7 p334), ActiveSupport 3.0.4:

foo = {ActiveSupport::OrderedHash['x', 'y'] => 'z'}
=> {#<OrderedHash {"x"=>"y"}>=>"z"}

YAML.dump(foo)
=> "--- \n!omap ? \n  - x: y\n: z\n\n"

The YAML that was dumped here is wrong. It should have been:
"--- \n? !omap \n  - x: y\n: z\n\n"

To demonstrate:
YAML.load("--- \n!omap ? \n  - x: y\n: z\n\n")
ArgumentError: syntax error on line 2, col -1: `  - x: y
: z

'

YAML.load("--- \n? !omap \n  - x: y\n: z\n\n")
=> {#<OrderedHash {"x"=>"y"}>=>"z"}

This issue is probably related to
http://www.ruby-forum.com/topic/215047. Does anyone know a workaround
for this. I've been looking into the sources, but I fear it will take me
a while to figure it all out and perhaps someone here has a solution at
hand?

-- 
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