While I know this can be done with some flas based solutions, how can
one limit the size of an upload to an RoR application within the
application rather than via apache's configuration? I just don't want
anyone trying to upload a 100mb file.
Haven't used FileColumn though I know that you can configure the :size
parameter of has_attachment in attachment_fu. You'll subsequently want
to use the built-in validates_as_attachment too.
I've heard good stories about the Paperclip plugin - you might want to
check out that one too.