Refresh token using Omniauth-oauth2 in Rails application?

[Ganesh Ranganathan]

I am using omniauth-oauth2 in rails to authenticate to a site which supports oauth2. The site gives me after doing the oauth dance, which I then persist into the database

1. Access Token
2. Expires_AT (ticks)
3. Refresh token

Is there an omniauth method to refresh the token automatically after it expires or should I write custom code which to do the same.

If custom code is to be written, is a helper the right place to write the logic?