Adding dynamic maps in DynamoDB with Kotlin - kotlin

Question

I'm using Spring Boot, Kotlin and CrudRepository to add items to my Dynamo Table.
The map I'm trying to add is dynamic, and can change attributes every single time.
I add the date of the object (delta) and save it, but I am having several errors:
When I save:
#DynamoDBTable(tableName = "delta_computers_inventory")
class DeltaComputersInventory(
#DynamoDBHashKey
#DynamoDBAttribute(attributeName = "delta_computers_inventory_id")
var id: String = UUID.randomUUID().toString(),
#DynamoDBTyped(DynamoDBMapperFieldModel.DynamoDBAttributeType.M)
#DynamoDBAttribute(attributeName = "delta")
var delta: Map<String, Any?> = mapOf(),
) {
#DynamoDBAttribute(attributeName = "date")
var date: String = OffsetDateTime.now(ZoneOffset.UTC).format(
DateTimeFormatter.ISO_DATE_TIME
)
}
and I do:
.doOnSuccess { listOfDocuments ->
deltaComputersRepository.saveAll(
listOfDocuments.map {
DeltaComputersInventory(
delta = it,
)
}
)
}
I get:
reactor.core.Exceptions$ErrorCallbackNotImplemented: com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMappingException: not supported; requires #DynamoDBTyped or #DynamoDBTypeConverted
instead, if I do it through an Item (Item.fromMap(it))
#DynamoDBTable(tableName = "delta_computers_inventory")
class DeltaComputersInventory(
#DynamoDBHashKey
#DynamoDBAttribute(attributeName = "delta_computers_inventory_id")
var id: String = UUID.randomUUID().toString(),
#DynamoDBTyped(DynamoDBMapperFieldModel.DynamoDBAttributeType.M)
#DynamoDBAttribute(attributeName = "delta")
var delta: Item = Item(),
) {
#DynamoDBAttribute(attributeName = "date")
var date: String = OffsetDateTime.now(ZoneOffset.UTC).format(
DateTimeFormatter.ISO_DATE_TIME
)
}
I get no error, but my item in my DynamoDB shows empty:
{
"delta_computers_inventory_id": {
"S": "d389d63e-8e93-4b08-b576-e37fae9a4d58"
},
"date": {
"S": "2023-01-24T12:00:33.620015Z"
},
"delta": {
"M": {}
},
}
What am I doing wrong?