[Rails] How to get access to /admin panel without Devise?

I have question:

How to get access to /admin panel without Devise?

And how to create admin user?

--
You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group.
To post to this group, send email to rubyonrails-talk@googlegroups.com.
To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msg/rubyonrails-talk/-/6Ct3tTSUWfUJ.
For more options, visit https://groups.google.com/groups/opt_out.