Generate Unique Random String With Letters And Numbers In Lower Case

Question

How can I fix this code so it generates unique random letters and numbers in lower case?

api_string = (0...32).map{65.+(rand(25)).chr}.join     

At the moment, it generates only letters.

Answer 1

If you are using ruby 1.9.2 you can use SecureRandom:

irb(main):001:0> require 'securerandom' => true irb(main):002:0> SecureRandom.hex(13) => "5bbf194bcf8740ae8c9ce49e97" irb(main):003:0> SecureRandom.hex(15) => "d2413503a9618bacfdb1745eafdb0f" irb(main):004:0> SecureRandom.hex(32) => "432e0a359bbf3669e6da610d57ea5d0cd9e2fceb93e7f7989305d89e31073690" 

Answer 2

All letters and digits, that's how numbers are represented in base 36.

api_string = Array.new(32){rand(36).to_s(36)}.join