[ruby-core:31917] Re: [Bug #3112] require "yaml" doesn't use psych as default

On Fri, Aug 27, 2010 at 09:09:27PM +0900, Anshul Khandelwal wrote:
> Issue #3112 has been updated by Anshul Khandelwal.
> 
> 
> Any updates on this?  Is there some way I can ensure that my code is using the bundled psych?

Psych is an "opt-in" experience for 1.9.2.  I'm not sure when we'll make
it the default YAML object.

There are two ways you can use Psych.  The first way is to just require
psych and reference the Psych constant:

    require 'psych'
    
    Psych.load '--- hello world!'
    Psych.dump { :goodbye => 'cruel world' }

The second way is to change the YAML engine:

    require 'yaml'

    YAML::ENGINE.yamler = 'psych'
    YAML.load '--- hello world!'
    YAML.dump { :goodbye => 'cruel world' }

Setting the engine will replace the YAML constant with the Psych
constant.  Using the first example will absolutely guarantee using
Psych.  The second example cannot guarantee usage because other
libraries could possibly set the engine back to "syck" without your
knowledge.

-- 
Aaron Patterson
http://tenderlovemaking.com/