> MY problem is: the final result will be a generated file on the
> filesystem, and i couldn't figure how to throw send_file in the mix. i
> looked at prawnto, rjs, builder and fleximage plugins. but all do not
> generate results on the filesystem (aka do not use send_file).
Josh is the guy who knows the most about the current api. He'll be
able to give you an official answer.
However my hunch is that you'll have to manually set the relevant
headers for X-Sendfile and render an empty string. If you're not
using X-Sendfile maybe you'll need to duplicate the behaviour that we
have in streaming.rb.
Given that revisiting the template API is one of yehuda's goals for
3.0, it could also be a good time to start thinking about additions to
the API to support this kind of thing.