Class: Faker::Finance

Inherits:
Base
  • Object
show all
Defined in:
lib/faker/finance.rb

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("finance.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