From: Matthew Kerwin <lists@...>
Date: 2013-03-13T08:58:50+09:00
Subject: Re: Access values for JSON.parse response

Nicole Villette wrote in post #1101285:
> Joel Pearson wrote in post #1101264:
>> There's probably a simpler way to lay this out, but this worked for me:
>> irb(main):022:0> recursive_find 'duration', h
>> => 30
>
> Joel,
>
> I do have one question for you.  What happens when there are duplicate
> names in the response.  For ex. duration and uri appear in different
> arrays, so how would you specify which one you want?

Well, one way I thought of was to have it do a select instead of a find 
(i.e. return all the matches, not just the first).  To make it useful, I 
had it return the path to the value as well as the value itself.

def recursive_select( key, object, path=[] )
  matches = []
  case object
  when Array
    object.each_with_index do |el, i|
      if el.is_a?(Hash) || v.is_a?(Array)
        res = recursive_select( key, el, path+[i] )
        matches += res if res
      end
    end
  when Hash
    matches << {'path'=>path+[key], 'value'=>object[key]} if 
object.has_key? key
    object.each do |k,v|
      if v.is_a?(Hash) || v.is_a?(Array)
        res = recursive_select( key, v, path+[k] )
        matches += res if res
      end
    end
  end
  matches.any? ? matches : nil
end

irb(main):005:0> recursive_select 'duration', h
=> [{"path"=>["TOD", "AdBreaks", "AdBreak", 0, "duration"], 
"value"=>30}, {"path"=>["TOD", "AdBreaks", "AdBreak", 0, "Ad", 0, 
"duration"], "value"=>30}]

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