Adding vertex with traversal in DSE Graph

[gw]

I am attempting to add a new Vertex and associate it with existing Vertex using traversal.  This method is not throwing any exceptions but the new Vertex is not created as a result.  Here is my code:

PassportTraversal<Vertex, Vertex> user_traversal = ... // get the user

user_traversal
    .as("user")
    .addV("account")
    .as("account")
    .property("accountI"D", accountId)
    .addE(has_account")
    .from("user")
    .select("account")
    .setProperties(newAccount)

    .iterate();

I've seen examples of adding vertices using graph but not with traversal.  Am I missing something here?

Cheers,

~gw

[Kevin Gallardo]

Hi George,

Are you sure the `user_traversal` traversal returns a vertex that exists? Could you show this traversal too please, as well as how you define "g"?

The usual semantics for adding vertices is, as recommended by TinkerPop:

g.

addV("....").property(...., ...).property(...., ...).as("fromV").

addV("....").property(...., ...).property(...., ...).as("toV").

addE("....").property(...., ...).

from("fromV").to("toV").

next(); // or iterate()

That should work, assuming "g" is a traversal source connected to DseGraph, via the `DseGraph.traversal(DseSession)`.

If one or both vertices already exist you can replace the `addV()` part with a traversal that gathers the vertex, such as `V().has(...., ...).as("from/toV")` and so on.

Please try this syntax and let us know how it goes.

Thanks.

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Kévin Gallardo.

kgdo.me

Software Developer in Drivers and Tools Team,

DataStax.

[gw]

Thanks, Kevin.  Your recommendation worked for me.

I am defining "g" as g = DseGraph.traversal(graphSession, MyTraversalSource.class) where MyTraversalSource extends GraphTraversalSource