How to use filter in comparing two strings

[TitiHl]

Hi,

Wanna ask how to convert following gremlin console code using gremlin-scala:
g.V().has("uuid", "someUuid").as("a").inE().as("e").outV().as("b").select("a", "b").by("uuid").filter{it.get().get("b").contains(it.get().get("a"))}.select("e").outV().valueMap("name")

This is a similar query from:
https://stackoverflow.com/questions/36045141/comparing-vertex-properties-in-gremlin-groovy

Thanks,
Alex

[mpollmeier]

select-by isn't supported in a typesafe way yet, there's #241 by @jeremysears to add this
However, since you're using lambdas anyway, you can do the following:

// your schema - define once globally somewhere
val uuid = Key[String]("uuid")
val name = Key[String]("name")
val a = StepLabel[Vertex]()
val b = StepLabel[Vertex]()
val e = StepLabel[Edge]()

val gs = g.V.has(uuid, "someUuid").as(a).inE.as(e).outV.as(b)
gs.select((a, b)).filterOnEnd { case (a, b) => b.value2(uuid) == a.value2(uuid)}
  .select(e).outV.value("name")

Note that I only checked that it compiles, since I don't have a test graph to verify it.

[TitiHl]

This looks cool. cleaner than what I have come up with the GraphTraversal way. Thanks 👍