class FactoryHelper::Finance

Constants

CREDIT_CARD_TYPES

Public Class Methods

credit_card(*types) click to toggle source
# File lib/factory-helper/finance.rb, line 7
def credit_card(*types)
  types = CREDIT_CARD_TYPES if types.empty?
  type = types.sample(:random => FactoryHelper::Config.random)
  template = numerify(fetch("credit_card.#{type}"))

  # calculate the luhn checksum digit
  multiplier = 1
  luhn_sum = template.gsub(/[^0-9]/, '').split('').reverse.map(&:to_i).inject(0) do |sum, digit|
    multiplier = (multiplier == 2 ? 1 : 2)
    sum + (digit * multiplier).to_s.split('').map(&:to_i).inject(0) { |digit_sum, cur| digit_sum + cur }
  end
  # the sum plus whatever the last digit is must be a multiple of 10. So, the
  # last digit must be 10 - the last digit of the sum.
  luhn_digit = (10 - (luhn_sum % 10)) % 10

  template.gsub! 'L', luhn_digit.to_s
  template
end