Previously, we were searching for a routes.rb to verify that we'd
already added the routes or not. We don't need to do this: the route
method will only ever inject into the config/routes.rb file it knows
about — so us looking elsewhere would never make a difference to the
outcome of the generator.
On top of this, the route method in turn leans on inject_into_file
from Thor which is configured to not force the result.
So, much of this can go. We just continue to check that we don't generate routes with no models.
https://github.com/rails/rails/blob/291a3d2ef29a3842d1156ada7526f4ee60dd2b59/railties/lib/rails/generators/actions.rb#L269 https://github.com/erikhuda/thor/blob/34df888d721ecaa8cf0cea97d51dc6c388002742/lib/thor/actions/inject_into_file.rb#L26