module FFaker::SSNSE

The Social Security number is a 12-digit number in the format: “YYYYDDMM-XXXX’

sv.wikipedia.org/wiki/Personnummer_i_Sverige

The 4 last digits (XXXX) are generated based on what region the person are born # in, the gender and the last one is a check digit using the luhn algorithm.

en.wikipedia.org/wiki/Luhn_algorithm

Usage: ssn(from: Time.local(1980, 2, 28),

to: Time.local(2000, 2, 28),
gender: :male)

Constants

GENDERS

Public Instance Methods

ssn(opts = {}) click to toggle source
# File lib/ffaker/ssn_se.rb, line 28
def ssn(opts = {})
  from   = opts[:from] || ::Time.local(1940, 1, 1)
  to     = opts[:to] || ::Time.now
  gender = (opts[:gender] || fetch_sample(GENDERS)).to_s

  raise_error_on_bad_arguments(from, to, gender)

  generate_ssn(from, to, gender)
end

Private Instance Methods

generate_ssn(from, to, gender) click to toggle source
# File lib/ffaker/ssn_se.rb, line 40
def generate_ssn(from, to, gender)
  birth_date = random_birth_time_between(from, to)
  birth_date_str = birth_date.strftime('%Y%m%d') # "19800228"
  region = random_region_for(gender) # "413"
  ssn_without_check_digit = birth_date_str + region # "19800228413"
  check_digit = luhn_check(ssn_without_check_digit) # "9"
  ssn_without_check_digit + check_digit # "198002284139"
end
raise_error_on_bad_arguments(from, to, gender) click to toggle source
# File lib/ffaker/ssn_se.rb, line 49
def raise_error_on_bad_arguments(from, to, gender)
  raise ArgumentError, 'Invalid from argument: from' unless to.is_a? ::Time
  raise ArgumentError, 'Invalid from argument: from' unless from.is_a? ::Time
  raise ArgumentError, 'Invalid argument: from > to' if from > to
  raise ArgumentError, 'Invalid argument: gender' unless GENDERS.include?(gender.to_s)
end
random_birth_time_between(from = ::Time.local(1940, 1, 1), to = ::Time.now) click to toggle source
# File lib/ffaker/ssn_se.rb, line 56
def random_birth_time_between(from = ::Time.local(1940, 1, 1), to = ::Time.now)
  ::Time.at(from + (rand * (to.to_f - from.to_f)))
end
random_region_even() click to toggle source
# File lib/ffaker/ssn_se.rb, line 68
def random_region_even
  rand(0..498) * 2
end
random_region_for(gender) click to toggle source
# File lib/ffaker/ssn_se.rb, line 60
def random_region_for(gender)
  region_number = case gender
                  when 'female' then random_region_even
                  when 'male' then random_region_odd
                  end
  three_character_string(region_number)
end
random_region_odd() click to toggle source
# File lib/ffaker/ssn_se.rb, line 72
def random_region_odd
  (rand(0..498) * 2) + 1
end
three_character_string(number) click to toggle source
# File lib/ffaker/ssn_se.rb, line 76
def three_character_string(number)
  format('%03d', number)
end