thoughtbot/paperclip — pull request #1187 by aarellano (2013-03-08 15:06:44+00:00)
Title: Adds expiring_url as an alias for url to attachment

If the `expiring_url` method is used when the storage is S3 or fog, the filesystem is no longer an option, since it doesn't declare this method. This situation forces you to use the cloud storage option in all the environments.

Having this simple alias allows you to use S3 or fog for production, and keep using the filesystem option for development and/or testing.