Carlos Hernández polimorfico

If you have problems with your params encodings, use a Rack middleware to encode them before rails params parsing code is executed.

First, build a class according to the signature of a rack middleware layer.

#lib/force_params_encoding.rb
class ForceParamsEncoding
  def initialize(app)
    @app = app
  end

	class SpanishTaxIdValidator < ActiveModel::EachValidator
	def validate_each(object, attribute, value)
	valid_tax_id = case
	when value.match(/^[0-9]{8}[a-z]/i)
	validate_nif(value.dup)
	when value.match(/[a-w][0-9]{7}[0-9a-z]/i)
	validate_cif(value.dup)
	when value.match(/[xyz][0-9]{7,8}[a-z]/i)
	validate_nie(value.dup)
	else

	<!DOCTYPE HTML>
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	<title>Quaderno.js for Stripe Subscriptions</title>

	<!-- jQuery is used only for this example; it isn't required to use Quaderno -->
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

	<!-- The required libs -->

	<!DOCTYPE HTML>
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	<title>Quaderno.js for One-off Charges on Stripe</title>

	<!-- The required libs -->
	<script type="text/javascript" src="https://js.stripe.com/v2/"></script>
	<script type="text/javascript" src="https://js.quaderno.io/v2/"></script>

	<!DOCTYPE HTML>
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	<title>Quaderno.js for Braintree Subscriptions</title>

	<!-- jQuery is used only for this example; it isn't required to use Quaderno -->
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

	<!-- The required libs -->

	<!DOCTYPE HTML>
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	<title>Quaderno.js for PayPal Subscriptions</title>

	<!-- jQuery is used only for this example; it isn't required to use Quaderno -->
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

	<!-- The required Quaderno lib -->