Dealing with Oauth 2.0-facebook gem error 100: This authorization code has been used

Question

I have been working on setting up facebook authentication for my rails app and while testing, after logging-in with my facebook account, I keep getting this error:

Answer 1

So I was able to work around this. It seems that my application was processing the facebook authentication, then trying to do it a second time and producing this error. Strange since I was trying to redirect to root_url. In any case, changing the page that I was redirecting to from "root_url" to "/" after storing the user info in my database seemed to make all the difference.

I would suggest checking your development log to see if you're getting a similar error.