elektronaut/dynamic_image — pull request #4 by elektronaut (2014-06-21 00:45:46+00:00)
Title: Add belongs_to_image

Not sure if this is the way to go, maybe it could be handled more elegantly with nested associations.

Also, it doesn't update the record if it already exists, leaving stray images. That might be a feature (leaving old URLs still accessible) or a bug.