HATEOAS on Spring Flux/Mono response

Question

I've been using Spring HATEOAS following the guidelines:

https://spring.io/guides/gs/rest-hateoas/#initial

package hello;

import static org.springframework.hateoas.mvc.ControllerLinkBuilder.*;

import org.springframework.http.HttpEntity;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

@RestController
public class GreetingController {

    private static final String TEMPLATE = "Hello, %s!";

    @RequestMapping("/greeting")
    public HttpEntity<Greeting> greeting(@RequestParam(value = "name", required = false, defaultValue = "World") String name) {

        Greeting greeting = new Greeting(String.format(TEMPLATE, name));
        greeting.add(linkTo(methodOn(GreetingController.class).greeting(name)).withSelfRel());

        return new ResponseEntity<Greeting>(greeting, HttpStatus.OK);
    }
}

Now I want to use a repository and output a Flux/Mono response:

@RestController
class PersonController {

    private final PersonRepository people;

    public PersonController(PersonRepository people) {
        this.people = people;
    }

    @GetMapping("/people")
    Flux<String> namesByLastname(@RequestParam Mono<String> lastname) {

        Flux<Person> result = repository.findByLastname(lastname);
        return result.map(it -> it.getFullName());
    }
}

How can I use Spring HATEOAS on a Flux/Mono response? Is it possible at all?

Answer 1

I think this project does not support (yet?) the new reactive support in Spring Framework. Your best bet is to reach out to the maintainers and contribute to the project (creating an issue and explaining what you're trying to achieve is a start!).