Rails5 implemented similar feature.

[matsubo]

Please update README to add this. https://github.com/rails/rails/blob/master/activerecord/lib/active_record/secure_token.rb

[gerardo-navarro]

Be careful because has_secure_token :token is not checking if the token exists; but of course, it is highly improbable that SecureRandom.base58(24) will return an uuid that already exists