Question

I’m trying to create PDFs that can be stored on an external server.

I do this:

    File.new("temp.pdf", "w").close
    File.open("temp.pdf", "wb") do |f|
        f.write(bytes)
    end
    File.open("temp.pdf", "r") do |f|
        # upload `f` to server
    end
    File.delete("temp.pdf")

then upload them to the server.

On my local machine this works fine, but, I recently tried running on another machine, and I got a permissions error in the log.

Is there a way to:

1. Write bytes to a file.
2. Never touch the hard disk.

Answer 1

Why don’t you just upload the bytes to the server?

You may have to go a little lower-level than normal, but check for instance the UploadIO class of the multipart-post gem.