# Add a "dig" method to Hash to check if deeply nested elements exist
# From: http://stackoverflow.com/questions/1820451/ruby-style-how-to-check-whether-a-nested-hash-element-exists
class Hash
  def dig(*path)
    path.inject(self) do |location, key|
      location.respond_to?(:keys) ? location[key] : nil
    end
  end
end