I have CarrierWave working fine through the typical ORM setup and upload via form. I would like to figure out how to use CarrierWave outside of the form submission context.
in the controller after user sign up (assuming your user image field is called simply 'image')
gravatar_url = "http://www.gravatar.com/avatar/#{Digest::MD5.new.update(current_user.email)}?s=512&d=identicon"
@user.remote_image_url = gravatar_url
@user.save
i think this is the best way according to carrierwave docs and some searching around.
enjoy!