An Italian tax code formal validator.

Algorithm that checks the formal validity of an Italian tax code. Due to the fact that only the Italian tax agency can release tax codes, this gem avoids the automatic calculation of a tax code, but it only checks the formal validity based on the public rules published by the Italian tax agency.

Install the gem. Then in your code:

require 'it_tax_code'

errors = ItTaxCode.errors_for "some-16-digit-italian-tax-code"

errors is an Array of String containing all the errors found.

Also an ActiveModel validator is present.

Install the gem, if you use bundler (I hope so) add in your Gemfile

gem 'it_tax_code', :git => 'git:https://github.com/mperrando/it_tax_code'

Then you can add the validation to your models.

class Person
  include ActiveModel::Validations
  attr_acessor :tax_code

  validates :tax_code, :presence => true, :it_tax_code => true
end

Check formal correctness given personal data (name, surname, place of birth, date of birth).