UniformListValues/FEATURE_UNIFORM_LIST_VALUES in edges

[Olav Laudy]

Hi,

If I issue in my TinkerGraph, Gremlin 3.3.1: graph.features() I see  UniformListValues: true for both Vertices and Edges

The way I understand this, is I can create lists as node or edge property/

This works:

g.V(171).property(set,'ff',2)

g.V(171).property(set,'ff',3)

['Vertex:',

 {'id': 171, 'label': 'object1', 'properties': {'ff': [2, 3], 'name': 2}}]

This: 

g.E(178L).property(set,'ff',2)

gives me an error:

('g', 'org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerEdge cannot be cast to org.apache.tinkerpop.gremlin.structure.Vertex')

In the java docs (https://www.javatips.net/api/tinkerpop-master/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/Graph.java), it looks like my understanding of  UniformListValues is what it is supposed to do

            /**

             * Supports setting of a {@code List} value.  The assumption is that the {@code List} can contain

             * arbitrary serializable values that may or may not be defined as a feature itself.  As this

             * {@code List} is "uniform" it must contain objects of the same type.

             *

             * @see #supportsMixedListValues()

             */

            @FeatureDescriptor(name = FEATURE_UNIFORM_LIST_VALUES)

            public default  boolean supportsUniformListValues() {

                return true;

            }

        }

What am I missing?

Thanks!

[Daniel Kuppitz]

Hi Olav,

what you are talking about, is supportsMultiProperties(). supportsUniformListValues() is really only about uniform List values, e.g. ...property('myList', [1, 2, 3]). And then theres supportsMixedListValues() for things like this: ...property('myList', [1, "abc", 3.1415])

Cheers,

Daniel

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