Retrieve path variable on Spring Boot WebFlux (functional approach)

Question

Let's say I have this router definition:

@Component
class PersonRouter(private val handler: PersonHandler) {
  @Bean
  fun router(): RouterFunction<ServerResponse> = router {
    ("/api/people" and accept(MediaType.APPLICATION_JSON_UTF8)).nest {
      GET("/{id}") { handler.findById(it) }
    }
  }

And then this handler:

@Component
@Transactional
class PersonHandler(private val repository: PersonRepository) {
  private companion object : KLogging()

  @Transactional(readOnly = true)
  fun findById(req: ServerRequest): Mono<ServerResponse> {
    logger.info { "${req.method()} ${req.path()}" }
    val uuid = ? // req.pathContainer().elements().last().value()
    return ServerResponse.ok()
        .contentType(MediaType.APPLICATION_JSON_UTF8)
        .body(BodyInserters.fromObject(repository.findById(uuid)))
        .switchIfEmpty(ServerResponse.notFound().build())
  }
}

How do I access the identifier (what would be a @PathVariable id: String on a typical @RestController) from ServerRequest without doing black magic with regular expressions, string-heavy-lifting, and such things?

Answer 1

Ah! Found it!

It is by doing: req.pathVariable("id")

It was there all the time...in the official Spring Framework (Web Reactive) documentation!