Nip
===

This gem provides the Nip class to check the NIP number.

NIP (Numer Identyfikacji Podatkowej) is the Polish Tax Identification Number. 

More information (in Polish language):
http://pl.wikipedia.org/wiki/NIP

If you are looking for the Nip as a plugin:
http://github.com/macuk/nip-plugin

Installation
============

gem install nip

Example
=======

Standalone class:

  nip = Nip.new('845-167-08-82')
  nip.valid?  # true
  nip.to_s    # '8451670882'

ActiveRecord:

  class Company < ActiveRecord::Base
    validate :check_nip

    private
      def check_nip
        n = Nip.new(nip)
        errors[:nip] << 'Invalid NIP number' unless n.valid?
      end
  end


Copyright (c) 2010 Piotr Macuk, released under the MIT license