How to delete object from list in JSON using SpringBoot and MongoDB

Question

In my project, I am using Spring Boot and MongoDB.

I would like to remove object from list in JSON by objectId :

I have a profile object in the database that looks like this:

{
    "_id" : ObjectId("61c05611a8237a39811ec3c0"),
    "runningStyle" : [ 
        {
            "_id" : ObjectId("61c05616a8237a39811ec3c1"),
            "name" : "name1",
            "priority" : "priority1",
            "average" : "1"
        }, 
        {
            "_id" : ObjectId("61c05616a8237a39811ec3c2"),
            "name" : "name2",
            "priority" : "priority2",
            "average" : "2"
        }, 
        {
            "_id" : ObjectId("61c05616a8237a39811ec3c3"),
            "name" : "name3",
            "priority" : "priority3",
            "average" : "3"
        }
    ]
}

I would like to remove object by its ID in list runningStyle in Profile object.

This is what I have tried in code:

RunningController.java

@DeleteMapping(value = "/delete/{runningStyleId}")
public void deleteRunningStyle(@PathVariable String runningStyleId){
   playingStyleService.deletePlayingStyle(playingStyleId);
}

RunningServiceImpl.java

@Override
public void deletePlayingStyle(String playingStyleId) {
        profile.ifPresent(up -> savedPlayingStyle.ifPresent(sps -> {
           
            up.getPlayingStyle().stream().filter(am -> am.getId().equals(playingStyleId))
                    .findFirst()
                    .ifPresent(ps -> profileRepository.deleteById(ps.getId()));
          
            playingStyleRepository.deleteById(playingStyleId);
        }));
}

With this code, I don't have any error, but object is not deleted from list in my Profile.

I have also tried by adding something like this in repository:

@Query(value = "{ '_id' : { '$oid' : ?0}}", delete = true)
void deleteRunningStyleById(String runningStyleId);

But it is not deleting it.

What am I doing wrong? What is the best way to achieve this?

UPDATE

I have added:

@Query(value = "{'$pull': {'runningStyle':{'_id' : ?0 }}}", delete = true)
void deleteRunningStyleById(String runningStyleId);

But I am getting following error:

unknown top level operator: $pull. If you have a field name that starts with a '$' symbol, consider using $getField or $setField.

Answer 1

Call $pull

@Autowired
private MongoTemplate mongoTemplate;
...

@Override
public void deletePlayingStyle(String playingStyleId) {
    Update update = new Update();
    // $pull
    update.pull("runningStyle", new Document("_id", new ObjectId(playingStyleId)));
    
    //UpdateResult { "acknowledged" : true, "matchedCount" : x, "modifiedCount" : y }
    //check if modifiedCount > 0 to make sure profile updated
    mongoTemplate.updateMulti(new Query(), update, Profile.class);
}