To be honest I'm new to ruby on rails so am following tutorials as I
go..
I assumed there would have to be an upload function in one of the
controllers to get this to work. As i'm relying on what I find online
I guessed I'd missed something, but not 100% sure..
I've also been working on extending the scaffolding feature Rails
provides to allow people to create scaffolding for specific plugins;
this might be a good way for you to get started:
http://patshaughnessy.net/2009/10/16/paperclip-scaffolding