Class: VatNumberValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
lib/validators/vat_number_validator.rb

Overview

en.wikipedia.org/wiki/VAT_identification_number ec.europa.eu/taxation_customs/vies/faqvies.do#item_7

Constant Summary collapse

REGEXP =

keys are ISO-3366-1 alpha2

{
  # 'NL' + 9 digits + B + 2-digit company index – e.g. NL999999999B99
  # Allow space, -, and . for formatting
  # TODO: I think this also has a check digit?
  nl: ->(v) { v.upcase.gsub(/[.\- ]/, '') =~ /\ANL\d{9}B\d{2}\z/ },
}.freeze

Instance Method Summary collapse

Instance Method Details

#validate_each(record, attribute, value) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/validators/vat_number_validator.rb', line 13

def validate_each record, attribute, value 
  key = (options[:country] || I18n.locale).downcase.to_sym
  key = :gb if key == :uk  # Since it's easy to get this wrong
  raise ArgumentError, "There is no validation for the country `#{key}'" if REGEXP[key].nil?

  value = value.to_s

  valid = true
  if REGEXP[key].respond_to? :call
    valid = false unless REGEXP[key].call value
  elsif value !=~ REGEXP[key]
    valid = false
  end

  if !valid
    record.errors.add attribute, (options[:message] || I18n.t('rails_validations.vat_number.invalid'))
  end
end