UPSERTing with TitanDB

Question

I\'m having my first steps as a TitanDB user. That being, I\'d like to know how to make an upsert / conditionally insert a vertex inside a TitanTransaction (in the

Answer 1

Here's a one-liner "getOrCreate" for Titan 1.0 and TinkerPop 3:

getOrCreate = { id ->
  g.V().has('userId', id).tryNext().orElseGet{ g.addV('userId', id).next() }
}

As taken from the new TinkerPop "Getting Started" Tutorial. Here is the same code translated to java:

public Vertex getOrCreate(Object id) {
  return g.V().has('userId', id).tryNext().orElseGet(() -> g.addV('userId', id).next());
}