thoughtbot/paperclip — pull request #1400 by thehenster (2013-12-13 21:10:38+00:00)
Title: document :s3_credentials being able to take a Proc

I managed to implement the :s3_credentials option being able to take a Proc until I found it was already there! :) My commit is just a docs addition to let people know it's possible. Very useful if you're dealing with lots of s3 buckets coming out of a database.