Could not locate method: NeptuneGraphTraversal.values()

Question

I'm getting this error Could not locate method: NeptuneGraphTraversal.values() when running a query using gremlin for aws neptune. The specific query is this:

import { process } from 'gremlin';

const { statics, t } = process;

    function getUsers() {
        return await this.query(g =>
            g
                .V()
                .match(
                    statics
                        .as('me')
                        .V(this.id)
                        // .has('user', t.id, this.id)
                        .fold()
                        .coalesce(
                            statics.unfold(),
                            statics.addV('user').property(t.id, this.id)
                        ),
                    statics.as('me').out('followed').out('followed').as('x'),
                    statics.as('x').not(statics.has(t.id, this.id)),
                    statics
                        .as('x')
                        .out('followed')
                        .has(t.id, this.id)
                        .count()
                        .is(0),
                    statics.as('x').in_('skip').has(t.id, this.id).count().is(0)
                )
                .select('x')
                .values(t.id)
                .dedup()
                .sample(3)
                .toList()
        );
    }

The error message suggests that neptune's GraphTraversal doesn't implement the values method, but I've reviewed the implementation differences and there's no mention of that. What could be the problem? What alternatives can I consider?

This is likely due to the fact that you're using the `values()` step to extract the ID. values() takes a string of a property key. More likely what you need is the `id()` step. — Taylor Riggan, Apr 29 '22 at 14:45
Thanks, I tried that and it's the same error but with `id` instead of `values`. Any ideas why that's happening? — Uche Ozoemena, Apr 29 '22 at 14:57
Never mind! I actually did do `.id(t.id)` by mistake. Using `.id()` made it work!! Thanks!! Please submit it as an answer so I can mark it as the accepted answer. — Uche Ozoemena, Apr 29 '22 at 15:05

score 1 · Accepted Answer · answered Apr 29 '22 at 15:28

1

This is likely due to the fact that you're using the values() step to extract the ID. values() takes a string of a property key. More likely what you need is the id() step.

answered Apr 29 '22 at 15:28

Taylor Riggan

1,963
6
12

Could not locate method: NeptuneGraphTraversal.values()

1 Answers1