flatten_with_path.rb

flatten_with_path.rb

# https://stackoverflow.com/questions/10712679/flatten-a-nested-json-object
# My Fixes
#
#   Input: {"twitter":{"aliases":{"twitter_alias":{}}}}
#   Old Ouput: {}
#   New Input: twitter.aliases.twitter_alias: <EMPTY>
#
module Enumerable
  def flatten_with_path(parent_prefix = nil)
    res = {}

    self.each_with_index do |elem, i|
      if elem.is_a?(Array)
        k, v = elem
      else
        k, v = i, elem
      end

      key = parent_prefix ? "#{parent_prefix}.#{k}" : k # assign key name for result hash

      if v.is_a?(Enumerable)
        res2 = v.flatten_with_path(key)
        res2 = {key => "<EMPTY>"} if res2.nil? or res2.empty?
        res.merge!(res2) # recursive call to flatten child elements
      else
        res[key] = v
      end
    end

    res
  end
end