Get document xattr._sync.rev value using SDK 3 sub document

Java SDK
2

Hi Nagarajan,

You’ve almost got it. Try this:

public static Optional<String> getSyncGatewayRevision(Collection c,
                                                      String documentId) {
  try {
    LookupInResult result = c.lookupIn(documentId,
        singletonList(LookupInSpec.get("_sync.rev").xattr()));
    return Optional.of(result.contentAs(0, String.class));

  } catch (PathNotFoundException notFound) {
    // document doesn't have Sync Gateway revision
    return Optional.empty();
  }
}

However, I’m not sure if accessing the revision like this is supported. To quote @jens in the SG REST Admin API gives misleading response - #7 by benjamin_glatzeder thread:

the best way to get the revision of a document is to use the SG REST API. Just GET the document and look at the _rev property of the response. Or if you’ve just created/updated the document with a PUT, the revision will also be available in the response.

Thanks,
David