Swiss-ify random data generated by faker

faker_ch.rb

# make faker a bit more swiss-friendly :)
module Faker
  class Company
    
    # Add swiss suffixes like AG, GmbH etc.
    def self.suffix
      %w(AG GmbH und\ Söhne und\ Partner &\ Co. Gruppe LLC Inc.).rand
    end
  end
  
  class Internet
    
    # Add extensions like ch, de, li and at
    def self.domain_suffix
      %w(com net biz ch de li at ch ch).rand
    end
  end
  
  class Address
    
    # Swiss ZIP codes are like 5000 or 3000 etc...
    def self.ch_zipcode
      "#{rand(9)+1}#{Faker.numerify('###')}"
    end
    # just some country codes...
    def self.country_code
      %w(CH CH CH DE AT US LI US HK VN).rand
    end
  end
  
  class PhoneNumber
    COMPANY_FORMATS = ['0800 ### ###', '0800 ## ## ##', '0## ### ## ##', '0## ### ## ##', '+41 ## ### ## ##', '0900 ### ###']
    SIMPLE_FORMATS  = ['0## ### ## ##', '+41## ### ## ##']
    MOBILE_FORMATS  = ['07M ### ## ##', '+417M ### ## ##', '0041 7M ### ## ##']
    
    # Allows creation of different phone numbers
    def self.ch_phone_number(kind = :simple)
      Faker.numerify const_get("#{kind.to_s.upcase}_FORMATS").rand.gsub('M', "#{rand(4)+6}")
    end
  end
end

In what context does this code work? In Ruby 1.9.3, I get:

NoMethodError: private method `rand' called for ["0## ### ## ##", "+41## ### ## ##"]:Array

So [].rand does not seem to work.

In 1.9.3 there's Array#sample, though this code is pretty old, so no idea if it still works as expected, good luck :)