In working on my Rails app, I have learned that "facebook.com/1234" AND "facebook.com/4321" could both potentially lead to "facebook.com/joe.bloggs". Bottom line, two numeric ids can redirect to the same user. I am collecting one numeric id using the authentication on my mobile app, but the authentication that occurs on my website dispenses yet another numeric id that points to the user. If I input either number after "facebook.com/", the browser will redirect it to "facebook.com/joe.bloggs" (example of course).
How can I see if these two numeric ids point to the same user in my Rails app?
