node.js - 无法读取 Stream.GridWriteStream 处未定义的属性“ObjectId”

Question

我收到此错误 - 无法在 gfs.createWriteStream 的 Stream.GridWriteStream 读取未定义的属性“ObjectId”。有趣的是我的实现直到昨天都运行良好。我无法弄清楚出了什么问题。

var Grid = require('gridfs-stream');

Grid.mongo = mongoose.mongo;
var gfs;

var mongoose = require('mongoose');
    mongoose.connect('mongodb://user:pass@example.com:15879/thing', function (error) {
        if (error) {
            console.log(error);
        }
    });

var conn = mongoose.connection;
conn.once('open', function callback(){
  gfs = Grid(conn.db);
  var writestream = gfs.createWriteStream({
    filename: "secure"
  });
});