Tempfile.new -> result not unique


I am using Tempfile to store temporary data on disk.

The documentation I’ve read (The Ruby Way, p353) states:

“The new method (Tempfile.new(“seed_str”)) takes a basename as a seed
string, and concatenates onto it the process id and a unique
sequence number.”

however, I am testing my web app, and request after request, I end up
with the exact same filename…

I worked around this by actually adding a random number within the
seed string:

rand_str = rand

however, I am sure there must be a way to get Tempfile to work
and return an actual unique name?

thanks for your help,