Gremlin 在 javascript AWS Lambda 中获得计数

Question

我正在尝试通过 AWS lambda 获取图表的边数 但是出现错误

g.V(...).inE(...).outV(...).count(...).then is not a function

我的 lambda 代码是：

const gremlin = require('gremlin');
const DriverRemoteConnection = gremlin.driver.DriverRemoteConnection;
const Graph = gremlin.structure.Graph;

exports.handler = (event, context, callback) => {    
    let dc = new DriverRemoteConnection('ws://<endpoint>:8182/gremlin');

    const graph = new Graph();
    const g = graph.traversal().withRemote(dc);

    g.V('19071640').inE('friend').count().then(num => console.log(num));
}

如果我这样做，它会起作用

g.V('19071640').inE('friend').outV().then(friends => console.log(friends));

Answer 1

我认为你需要iterate your traversal。

g.V('19071640').inE('friend').count().next().then(num => console.log(num));