From: Brian Candler <b.candler@...>
Date: 2008-11-10T07:12:30+09:00
Subject: Re: changing the value of a hash

Jf Rejza wrote:
> I want to change the value of
> the key called "mail".

I'd probably just write something simple like:

  h = s.attributes
  h['mail'].gsub!('@',' (at) ') if h['mail']

If you really want to iterate, then

  h = s.attributes
  h.each { |k,v| h[k] = v.gsub('@',' (at) ') if k=='mail' && v }

And if you want to write it as a one-liner, look at inject or merge. If 
you know there's always a mail attribute, then:

  s.attributes.merge( 'mail' => s.attributes['mail'].gsub('@',' (at) ' 
).to_json
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