Class: Faker::Finance
Constant Summary collapse
- CREDIT_CARD_TYPES =
[:visa, :mastercard, :discover, :american_express, :diners_club, :jcb, :switch, :solo, :dankort, :maestro, :forbrugsforeningen, :laser].freeze
Constants inherited from Base
Base::Letters, Base::Numbers, Base::ULetters
Class Method Summary collapse
Methods inherited from Base
bothify, fetch, fetch_all, flexible, letterify, method_missing, numerify, parse, rand, rand_in_range, regexify, sample, shuffle, translate, unique, with_locale
Class Method Details
.credit_card(*types) ⇒ Object
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# File 'lib/faker/finance.rb', line 9 def credit_card(*types) types = CREDIT_CARD_TYPES if types.empty? type = sample(types) 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) end |