module MultiXml

def undasherize_keys(params)
  case params
  when Hash
    params.each_with_object({}) do |(key, value), hash|
      hash[key.to_s.tr("-", "_")] = undasherize_keys(value)
      hash
    end
  when Array
    params.collect { |value| undasherize_keys(value) }
  else
    params
  end
end