Setting one mono within another using webflux

Question

I am retrieving a publisher Mono<ProductOrder> from mongo db

I have another publisher Mono<CommandResponse>

I want to set ProductOrder object into CommandResponse as it is a part of that class. like commandResponse.setProductOrder(po instance)

CommandResponse will also have different Mono or String or Int apart from ProductOrder instance

Finally want to return Mono<ServerResponse> which would contain body of CommandResponse

i am not being able to set the Mono<ProductOrder> object into Mono<CommandResponse>

Pleas help. Thanks.

CODE SNIPPET

@Component
public class Handler {


    @Autowired
    private MongoService service;

    public Mono<ServerResponse> get(ServerRequest request) {
        Mono<ProductOrder> p = service.queryById();
        
        

> Here, in the return statement i want to return Mono<CommandResponse> 
> instead of Mono<ProductOrder> in the response body
> remember: CommandResponse has a reference to ProductOrder

        return 
            ServerResponse.ok()
                .contentType(MediaType.APPLICATION_JSON)
                .body(p, ProductOrder.class).map(null);
        );
    }
}

If you could add an actual code snippet, you'd have a better chance getting help. — Martin Tarjányi, Apr 20 '21 at 19:56

score 2 · Accepted Answer · answered Apr 20 '21 at 21:07

Mono<CommandResponse> commandMono = ... // I don't how it is set 
Mono<ProductOrder> productMono = service.queryById();
Mono.zip(commandMono, productMono)
  .map(tuple -> { 
    var command = tuple.getT1();
    var product = tuple.getT2();
    command.setProductOrder(product) // => .setProductOrder(po instance)
    return command;
  })
  .flatMap(command -> ServerResponse.ok()
    .contentType(MediaType.APPLICATION_JSON)
    .bodyValue(command)
  )

I haven't run this code, so I'm not sure if it compiles, but with it you should be able to figure out how your code could work

Setting one mono within another using webflux

1 Answers1