How to clone a vertex with edges

[danielcweber]

Discussed in #552

^{Originally posted by rautjris February 25, 2022}
Hi !

Need some advice how to clone a Vertex with it's properties and Edges/edge properties to a new Vertex.
I'm newbie with gremlin and using Cosmos Db gremlin.

This is what I have now:

await g.V(sourceid).As((, source) => _
.AddV(new SampleVertex())
.As(( _ , clone) => _
.SideEffect(s =>
{
return s.Select(source).OutE().As(( _ , e) => _
.Select(e).InV().AddE().From(f => f.Select(clone)));
}
)
));

But I'm out of ideas how to copy properties.

Thanks in advance

[github-actions]

Hello @danielcweber,
thanks for your interest in ExRam.Gremlinq. The issue was labelled "How would this look like in raw Gremlin?" because it seems you tried to formulate a query with ExRam.Gremlinq that fails either when constructing or executing the query. This might be a shortcoming or missing feature of ExRam.Gremlinq, however, in this case, it seems that there is not much that ExRam.Gremlinq could do since there is no valid Gremlin that it could construct that would achieve what you intended. In general, or when you feel that it should be possible, the question is: How would this look like in raw Gremlin? If you're new to Gremlin, check out the Tinkerpop reference.

[danielcweber]

@rautjris For clarification: It seems that you're trying to write a query in Gremlinq when it's unclear how the query could be written in raw Gremlin. Such questions are probably better formed as a question on [https://groups.google.com/g/gremlin-users](the mailing list).

[rautjris]

@danielcweber I'm using the ExRam.Gremlinq and trying to do similar "clone a node and it's edges" like in this Stackoverflow post using the ExRam.Gremlinq.
https://stackoverflow.com/questions/51900116/gremlin-clone-a-node-and-its-edges

So I'm selecting the source properties and trying to set those in clone properties.
.Select(clone).Property(p.Value.Key, p.Value.Value)); sounds promising but looks like it is not the way to go.

        var result =  _g.V<SampleVertex>(sourceid).As((_, source) => _
            .AddV<SampleVertex>()
            .As((_, clone) => _
            .SideEffect(s =>
            {
               return s.Select(source).Properties().As((_, p) => _
                .Select(clone).Property(???));
                //what to put here? raw gremlin should be like: property(select('p').key(), select('p').value())).
            }
            )
            .SideEffect(s =>
                    {
                        return s.Select(source).OutE<SampleEdge>().As((_, e) => _
                        .Select(e).InV().AddE<SampleEdge>().From(t => t.Select(clone)));
                    }
                )
            )).Debug();

[danielcweber]

what to put here? raw gremlin should be like: property(select('p').key(), select('p').value())).

That would surely work well in Gremlin, however, property-overloads that would take traversals for key and value are, as it is now, not part of Gremlinq. It might be implemented in an upcoming release though. PRs, as always, are always appreciated.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.