CODEWITHSUNDEEP
reactive-programmingspring-webfluxproject-reactor
techcomp
techcomp

Reputation: 400

Mixing two Mono and return first one with second in firsts body

I am facing a situation where I have to use 2 Mono where second one will be dependent on an Id field of first one and return the response of second one in the body of first Mono.

For example :

Mono<Article> first = fetchArticleById(id);

Mono<Rating> second = fetchRating(article.getRatingId()); //here I will use the response from 
first Mono,

then return the result as

/* this is the response of first Mono, the rating field is set by second Mono */
Article {
"id":1234,
"text" : "some text",
"rating" : "5 star", //fetched from second Mono
"ratingId":qq11
}

I have tried

first.map(art -> {
 return fetchRating(art.getRatingId());
});

But like this, I can only return response of second Mono.

By trying Map or Flatmap, it only works on the second mono.

Please suggest.

Upvotes: 0

Views: 1440

Answers (1)

sawim
sawim

Reputation: 1082

fetchArticleById(id)
  .flatMap(art -> fetchRating(art.getRatingId())
    .map(rating -> new Pair(art, rating)));

In the map function you have access to both article and rating, so you connect them as you need.

Upvotes: 1

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