Rails: on-the-fly streaming of output in zip format?

I need to serve some data from my database in a zip file, streaming it on the fly such that:

• I do not write a temporary file to disk
• I do not compose the whole file in RAM

I know that I can do streaming generation of zip files to the filesystemk using ZipOutputStream as here. I also know that I can do streaming output from a rails controller by setting response_body to a Proc as here. What I need (I think) is a way of plugging those two things together. Can I make rails serve a response from a ZipOutputStream? Can I get ZipOutputStream give me incremental chunks of data that I can feed into my response_body Proc? Or is there another way?