From: Phillip Gawlowski <cmdjackryan@...>
Date: 2008-03-16T23:15:47+09:00
Subject: Re: argh! more undocumented mysteries: to_yaml

Tom Cloyd wrote:
> Beginner woes, here, no doubt, but woes nevertheless.
> 
> I'm exploring the wonders of the Object class, and I see Object#to_yaml. 
> Seems pretty obvious what to expect here, which would seem to account 
> for the total lack of documentation in each of the gazillion instances 
> of this method which appear in core library. Still, let's test it...
> 
> irb(main):010:0> [2,5,3,6,'abc'].to_yaml
> NoMethodError: undefined method `to_yaml' for [2, 5, 3, 6, "abc"]:Array
>        from (irb):10
>        from :0
> 
> Can someone explain what just happened?
> 
> Thanks!
> 
> t.
> 
irb(main):005:0> [2,3,4].to_yaml
NoMethodError: undefined method `to_yaml' for [2, 3, 4]:Array
         from (irb):5
         from :0
irb(main):006:0> require "yaml"
=> true
irb(main):008:0> [2,3,4].to_yaml
=> "--- \n- 2\n- 3\n- 4\n"

See also:
http://ruby-doc.org/core/classes/YAML.html

--Phillip Gawlowski