I had the same problem with some of my projects, where some images or
files had to be accessible only to logged users.
The solution is easy (I'm using file_column but the idea is the same),
when you declare has_attachment you can also select where to save your
files using :path_prefix .
You can set something like :path_prefix => "resources/#{table_name}" or
some other non public directory to avoid accessing the files directly by
passing a url.
To access the files, you call a method in a controller that serves back
the file using the send_file function. Check the api for better info
about it, you can send back the file inline (to be used in an image_tag
for instance) or as a download.
Since the file is sent by a method, it's easy to prevent its download
from non authorized user
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