module MultiXml

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