How to code in reactor to update a specific field in a cassandra DB record


How to code in reactor to update a specific field in a cassandra DB record



I am using ReactiveCassandraRepository and I can create new record as below.


public Mono<String> saveAbc(Abc toBeSaved) {
return abcRepository.save(toBeSaved).map(saved -> saved.getId());
}



But I could not imagine how to update a specific field in a DB record since 2 reactive operations (findById & save) are involved.



I wrote a code as below to create or update status if exists, but seems to be not working.


public Mono<String> saveAbc(Abc toBeSaved) {
return abcRepository.findById(toBeSaved.getId())
.map(current -> abcRepository.save(transform(toBeSaved, current)).map(saved -> saved.getId()))
.flatMap(id -> id);
}

private Abc transform(Abc toBeSaved, Abc current) {
if(current == null) {
return toBeSaved;
} else {
current.setStatus(toBeSaved.getStatus());
return current;
}
}



Can someone please assist on that?





How is this not working? Do you see error messages?
– Lajos Arpad
Jun 29 at 11:30





No any error logged, but object is not persisting in DB.
– user3332279
21 hours ago









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