This:

```ruby
resource :geocoder
```

and this:

```ruby
  resource :geocoder
  resolve('Geocoder') { [:geocoder] }
```

create exactly the same routes. Thus, it's better to show the simpler example rather than imply that both method calls are needed.

`resolve` is used for [polymorphic routes](https://guides.rubyonrails.org/routing.html#using-resolve) but isn't necessary in this example.