Ruby Implementation of "valueForKeyPath"

value_for_key_path.rb

class Hash
  def key_path(dotted_path)
    # see http://stackoverflow.com/questions/7139471/transform-a-ruby-hash-into-a-dotted-path-key-string
    parts = dotted_path.split '.', 2
    match = self[parts[0]]
    if !parts[1] or match.nil?
      return match
    else
      return match.key_path(parts[1])
    end
  end
end

Originally from http://stackoverflow.com/questions/7139471/transform-a-ruby-hash-into-a-dotted-path-key-string

spot on!!!