Filters not working after upgrading to 4.4.0

After trying to upgrade from 4.2.8 (tested on 4.3.0, seems to work OK there) to 4.4.0 I am getting errors in my tests because the filters doesn’t seem to work as they used to. Only change is the upgrade to my kmongo-coroutine version.

Is there something in these filters that is expected to break between 4.3.0 and 4.4.0?

val filter = and(
    or(
        MyClass::someId eq someId,
        MyClass::someOtherId eq someOtherId,
        MyClass::nestedObject / NestedClass::yetAnotherId eq yetAnotherId
    ),
        MyClass::nestedObject exists true
)
collection
    .find(clientSession, filter)
    .sort(descending(MyClass::lastModifiedDate))
    .toList()

For instance I am now getting back documents that clearly does not have the “MyClass::nestedObject”.

[zigzago]

@Lezzio I do reproduce the bug with ObjectMappingConfiguration.serializeNull = false & save/replace usage. I’m going to release a fix (see https://github.com/Litote/kmongo/issues/319)

[zigzago]

@bjaanes this should work with 4.4.0 and above:

fun setUpMongoClient(dbUri: String, vararg jacksonModules: Module): CoroutineClient {
    //must be called before any KMongoConfiguration call
    ObjectMappingConfiguration.serializeNull = false
    val connectionString = ConnectionString(dbUri)
    val settings: MongoClientSettings = MongoClientSettings.builder()
        .applyConnectionString(connectionString)
        .retryWrites(true)
        .build()
   //do not use bsonMapper directly 
    jacksonModules.forEach { KMongoConfiguration.registerModule(it) }
    //this is handled by ObjectMappingConfiguration.serializeNull 
    //KMongoConfiguration.bsonMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL)
    return KMongo.createClient(settings).coroutine
}