rails5 でアプリ名を確認するにはどうすればいいの?これで簡単!
# bundle exec rails c
Loading development environment (Rails 5.1.6)
> File.basename(Rails.root.to_s)
=> "server"
# bundle exec rails c
Loading development environment (Rails 5.1.6)
> File.basename(Rails.root.to_s)
=> "server"