Golang SDK - Get ID after creating new node

[Laura Poss]

Hi! I'm using gremlin-go to interact with my graph and was wondering if there is an easier way to get the ID of a new node.

Right now I'm creating the node like so:

promise := g.AddV("my_node_type").Property("name", "foobar").Iterate()

err := <-promise

if err != nil {

  return err

}

But to get the ID I need to read the new node back from the graph:

result, err := g.V().HasLabel("my_node_type").Has("name", "foobar").ToList()

if err != nil {

  return err

}

if len(result) == 0 {

  return fmt.Errorf("no results")

}

id := result[0].GetString()

Seems like in other languages the SDK will return the ID of the new node after its created. Is there a better way than what I'm doing in Golang?

[Yang Xia]

Hi,

The step "Iterate()" is a terminal step which sends the traversal through the remote connection, by definition it does not return anything (same across all clients), see https://tinkerpop.apache.org/docs/current/reference/#terminal-steps.

So if you want to get the id returned within the same query, use another terminal step that returns a result, e.g. "Next()" inteas of "Iterate()".

result, err := g.AddV("my_node_type").Property("name", "foobar").Next()

if err != nil {

  return err

}

id := result.GetString()

Hopefully this helps. 

Yang

--
You received this message because you are subscribed to the Google Groups "Gremlin-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to gremlin-user...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/gremlin-users/6127c2d5-e50c-46f1-b269-93334bdb14a5n%40googlegroups.com.

[Laura Poss]

This worked perfectly! Thanks for flagging the terminal steps!

[Yang Xia]

You are welcome, glad it works for you! 

To view this discussion on the web visit https://groups.google.com/d/msgid/gremlin-users/e33f85b8-4020-457b-b504-eb651153e209n%40googlegroups.com.