Trying to understand Redirect back to current page after sign in, sign out, sign up, update DEVISE

I am aware of these guides:

• https://github.com/heartcombo/devise/wiki/How-To:-[Redirect-back-to-current-page-after-sign-in,-sign-out,-sign-up,-update]

My code for my ApplicationController can be found here

My after_sign_in_path_for(resource_or_scope) method returns nil when I put a debugger in it and I am trying to understand why that is the case:

stored_location_for(resource_or_scope)

=> nil

resource_or_scope

=> #<Userinstance>

super

=> "/"