Johan Posts - Answer Overflow

Johan

•Created by Johan on 6/1/2024 in #questions

Does the TinkerGraph in-memory database support List cardinality properties for vertices?

It is my understanding that the following code should work:

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.Vertex;
import org.apache.tinkerpop.gremlin.structure.VertexProperty;
import org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph;
import org.junit.jupiter.api.Test;

import java.util.Map;

import static org.apache.tinkerpop.gremlin.process.traversal.AnonymousTraversalSource.traversal;

public class GremlinTest {

    @Test
    public void testGremlin() {
        try (TinkerGraph graph = TinkerGraph.open()) {
            GraphTraversalSource g = traversal().withEmbedded(graph);
            g.addV("CH")
                    .property("key", "123")
                    .property("age", 20)
                    .property("gender", "male")
                    .property(VertexProperty.Cardinality.list, "address", "a street, a city")
                    .property(VertexProperty.Cardinality.list, "address", "b street, b city")
                    .next();
            GraphTraversal<Vertex, Map<Object, Object>> traversal = g.V().hasLabel("CH").elementMap();
            while (traversal.hasNext()) {
                Map<Object, Object> node = traversal.next();
                System.out.printf("%s", node);
            }
        }
    }
}

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.Vertex;
import org.apache.tinkerpop.gremlin.structure.VertexProperty;
import org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph;
import org.junit.jupiter.api.Test;

import java.util.Map;

import static org.apache.tinkerpop.gremlin.process.traversal.AnonymousTraversalSource.traversal;

public class GremlinTest {

    @Test
    public void testGremlin() {
        try (TinkerGraph graph = TinkerGraph.open()) {
            GraphTraversalSource g = traversal().withEmbedded(graph);
            g.addV("CH")
                    .property("key", "123")
                    .property("age", 20)
                    .property("gender", "male")
                    .property(VertexProperty.Cardinality.list, "address", "a street, a city")
                    .property(VertexProperty.Cardinality.list, "address", "b street, b city")
                    .next();
            GraphTraversal<Vertex, Map<Object, Object>> traversal = g.V().hasLabel("CH").elementMap();
            while (traversal.hasNext()) {
                Map<Object, Object> node = traversal.next();
                System.out.printf("%s", node);
            }
        }
    }
}

The output when this is executed is:

{id=0, label=CH, address=b street, b city, gender=male, key=123, age=20}

{id=0, label=CH, address=b street, b city, gender=male, key=123, age=20}

However, I would expect its output to be something like this:

{id=0, label=CH, address=["a street, a city", "b street, b city"], gender=male, key=123, age=20}

{id=0, label=CH, address=["a street, a city", "b street, b city"], gender=male, key=123, age=20}

Does anyone know what I am doing wrong here?

8 replies

Gaming

Programming