Search code examples
javaannotationsamazon-dynamodblombok

Java Annotation for composite Range Keys in DDB

I have a my_table with a composite sort key made of two combined attributes id and model_name (i.e., id_model_name, similarly from what is done here here and here).

So I created this Java model:

@Builder
@Data
@AllArgsConstructor
@NoArgsConstructor
@DynamoDBTable(tableName = "my_table")
public class TableModel {

    private static final String COMPOSITE_KEY_SEPARATOR = "_";

    @DynamoDBAttribute(attributeName = "id")
    private String id;

    @DynamoDBAttribute(attributeName = "model_name")
    private String modelName;

    @DynamoDBRangeKey(attributeName = "id_model_name")
    public String getIdModelName() {
        return String.format("%s%s%s", id, COMPOSITE_KEY_SEPARATOR, modelName);
    }

    // more stuff...
}

However I'm getting:

DynamoDBMappingException: DRTFacet[id_model_name]; could not unconvert attribute

Notice that there is no String idModelName field, because it could mess up with @AllArgsConstructor and @Builder (since it's a derived field). Is it because this field is missing (together with a setter method?). How can I overcome this?

Solution

  • I found out that providing a dummy setter solved the problem:

    public void setIdModelName(final String idModelName) {}