And I'm not doing anything with `segment`, so it doesn't make sense to iterate segments with `inject`, right?

```ruby
      def default_keys_in_lookup_path
        defaults = []
        lookup_path = controller_name.split('.')
        lookup_path.inject([]) do |defaults, _|
          defaults << ['titles', *lookup_path, 'default'].join('.').to_sym
          lookup_path.pop
        end
        defaults.reverse
      end
```