Upgrading to Rails 7

Hi everyone,

I had a rails 6.1 app and thought I'd upgrade it to Rails 7 to enjoy the new features. I thought moving from 6.1 to 7 would be fairly straight forward, as I know there's people upgrading from v5 to 7.
Long story short, I'm finding it a complete mess with issue after issue, which has so far been mostly with Devise. For instance, current_user.column_name is not found.
Are there any decent tutorials out there for the upgrade? I was using the official documentation, but I think I will need more to read up on.

Thanks