plataformatec/devise — pull request #1884 by rmello (2012-05-30 13:28:58+00:00)
Title: Adds Flexibility to change the "reconfirmable_attribute"

I am using the user's mobile_phone_number as the "confirmation column" since i am writing a system that interacts using SMS (instead of emails).

The confirmation/reconfirmations was tied to :email field so I added two config parameters (kept the default on :email and :unconfirmed_email) so I can change the attribute from the Devise config file.