processor context

[brewster1134]

I noticed that in the specs, the test FakeContext logical path is /assets/css/jada.css. But while playing around with urlrewriter, I noticed that sprockets uses a relative url from the loaded asset_path. So the actual context used in the example would just be jada.css

I noticed this after assets were failing when config.assets.debug was true (so basically the default development env) since the rewritten url was actually relative to /assets instead of being absolute and including '/assets' directly in the new url.

As a temporary fix I am conditionally registering the preprocessor...

Rails.application.assets.register_preprocessor 'text/css', Sprockets::UrlRewriter unless Rails.application.config.assets.debug

But it would be better to inject Rails.application.config.assets.prefix into the new url but not sure the best way to do that. maybe need a railtie?

thoughts?