Serving .ejs files from rails?

I feel like an idiot for not being able to figure this out, but here

I use the ‘ejs’ gem to create ejs template files. My
assets/javascripts/foo.jst.ejs file is served up as
localhost:3000/assets/foo and assets/foo.js, but
localhost:3000/assets/foo.ejs gives a routing error. I have some
code that insists on calling it with the .ejs extension.

Do I configure this in the asset pipeline somewhere or do I use some
routes.rb trickery to get around this?