From: Gennady Bystritsky <Gennady.Bystritsky@...>
Date: 2009-01-31T07:46:18+09:00
Subject: Re: YAML to anchor same strings in dumps


> -----Original Message-----
> From: Gennady Bystritsky [mailto:Gennady.Bystritsky@quest.com] 
> Sent: Thursday, January 29, 2009 9:32 PM
> To: ruby-talk ML
> Subject: YAML to anchor same strings in dumps
> 
> Hi, there
> 
> Is there any way to make YAML alias same strings in dumps? 
> The following code fragment:
> 
> require 'yaml'
> s = 'a' * 10
> puts [ s, s ].to_yaml
> 
> Produces this:
> ---
> - aaaaaaaaaa
> - aaaaaaaaaa
> 
> While I need:
> ---
> - &id001 aaaaaaaaaa
> - *id001

Found a solution:

module ComplexYamlObject
  def is_complex_yaml?
    true
  end
end

s = 'a' * 10
s.extend ComplexYamlObject
puts [ s, s ].to_yaml

Then the output will be just as I originally wanted:

---
- &id001 aaaaaaaaaa
- *id001

Thought somebody might find it useful,
Gennady.