Comparing property values?

[John Whelan]

I'm looking to match a property value from a previously traversed vertex to the property value of a different vertex. I'm assuming that I should be keeping track of the previous value with as(), but I cannot figure out how to use the value later in the traversal for comparison. Am I close? (As highlighted below, if I hard code the value, it seems to work.However, I will not always know the value ahead of the traversal )

import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
import org.apache.tinkerpop.gremlin.structure.Graph;
import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph;


public class SameAge {


 public static void main(String[] args) {
 Graph graph = TinkerGraph.open();
 Vertex a = graph.addVertex();
 Vertex b = graph.addVertex();
 Vertex c = graph.addVertex();
 a.property("name", "Henry");
 a.property("age", "9");
 b.property("name", "Carlos");
 b.property("age", "9");
 c.property("name", "Teagan");
 c.property("age", "7");
 a.addEdge("knows", b);
 a.addEdge("knows", c);


 GraphTraversalSource g = graph.traversal();
 GraphTraversal<Vertex, String> query = g.V(a).as("start").properties("age").as("years").select("start").out().has("age", "9").values("name");
 
 while (query.hasNext()) {
 String result = query.next();
 System.out.println("result = " + result);
 }
 }
}

[Daniel Kuppitz]

Using retain():

gremlin> g.V(a).as("x").values("age").as("age").select("x").out().has(values("age").retain("age")).values("name")
==>Carlos

Using match():

gremlin> g.V(a).match("a",
gremlin>   __.as("a").values("age").as("age1"),
gremlin>   __.as("a").out().as("b"),
gremlin>   __.as("b").values("age").as("age2")).where("age1", eq("age2")).select("b").values("name")
==>Carlos

Cheers,

Daniel

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[John Whelan]

Thanks. That solved it.

To view this discussion on the web visit https://groups.google.com/d/msgid/gremlin-users/CA%2Bf9seXU850j2Zr-h0Oqk-50Pbw7apmh%3D_pNS49iP39_EpBj_g%40mail.gmail.com.

[Gwendal Daniel]

Hi, do you know if it is possible to achieve the same with gremlin 2? I am stuck to this version and the traversal you propose does not seem to be compatible with previous versions of gremlin.
Thanks!

[Daniel Kuppitz]

No, TP2 didn't have anything close to this. You'll have to use good old lambdas,

Cheers,

Daniel

[Suvendu Mohanty]

Thannk you Daniel, this was helpful for a problem I was working. Kudos to you.