From: Matthew Kerwin <lists@...>
Date: 2013-03-12T06:14:58+09:00
Subject: Re: Access values for JSON.parse response

Nicole Villette wrote in post #1101133:
> Hello, Does anyone know [how] to get the values from a nested hash in
> Ruby.

Yep.

> I made the following request which after doing the JSON.parse, it
> returns a nested hash with arrays. So, I am trying to figure out how to
> access the values in the response.  See below for response.

Since your "parsed" object is a Hash, you can access the first level of 
nesting with:
  parsed['TOD']
which returns a Hash, so you can access the next level with:
  parsed['TOD']['AdBreaks']
and so on.

At some point in your structure there's an Array instead of a Hash, so
you'd need to use something like:

  parsed['TOD']['AdBreaks']['AdBreak'][0]['duration']
  # or
  parsed['TOD']['AdBreaks']['AdBreak'].first['duration']

But personally I'd probably go for one of the following:

  parsed['TOD']['AdBreaks']['AdBreak'].map{|ad|
ad['duration'] }
  # or
  parsed['TOD']['AdBreaks']['AdBreak'].any?{|ad|
ad['duration'] == 30 }
  # or
  parsed['TOD']['AdBreaks']['AdBreak'].select{|ad|
ad['duration'] == 30 }

Also note: this is yucky.  Yucky yucky yucky.  A saner person might use
some local variables.  Even one will help a lot:

  adbreaks = parsed['TOD']['AdBreaks']['AdBreak']
  # while I'm here: why does 'AdBreaks' hold one item,
  # but 'AdBreak' hold an array?  Odd.
  lengths_of_breaks = adbreaks.map {|ad| ad['duration'] }
  list_of_30s_breaks = adbreaks.select {|ad| ad['duration'] == 30 }
  # etc.

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