"参数必须是字符串"，在节点中具有某些MongoDB ObjectID.js

Question

我在 Node 中收到这样的错误：

TypeError: Argument must be a string
    at TypeError (native)
    at Buffer.write (buffer.js:791:21)
    at serializeObjectId
    <snip>

条件是使用MongoDB进行查找操作时ObjectID的一些用途。ObjectID的某些用途引发了此错误，而有些则没有。唯一重要的是ObjectID来自哪里。如果它是从现有集合中提取的，它可以工作。如果我自己生成它（例如，使用ObjectID.createFromHexString），它失败了，如上所述。

Answer 1

将 mongodb 版本更改为 2.1.6。

Answer 2

我花了几个小时追踪这个。问题归结为我对猫鼬的使用。我为我的一些收藏使用了猫鼬模式，而没有将猫鼬用于其他收藏。这是包含我有问题的代码的文件：

// Some common MongoDb operations and data.
'use strict';
var MongoClient = require('mongodb').MongoClient;
var assert = require('assert');
var logger = require('./Logger');
var mongoose = require('mongoose');
// TODO: Take this out for production.
mongoose.set('debug, true');
var PSSharingInvitations = require('./PSSharingInvitations')
var connectedDb = null;
// Call this just once, at the start of the server.
// TODO: Need better error handling when can't initially connect. Right now have an ugly looking error when Mongo is not already started and we try to start our server.
exports.connect = function(mongoDbURL) {
    MongoClient.connect(mongoDbURL, function(err, db) {
        assert.equal(null, err);
        if (!db) {
            logger.error("**** ERROR ****: Cannot connect to MongoDb database!");
        }
        else {
            mongoose.connect(mongoDbURL);
            var db = mongoose.connection;
            db.on('error', console.error.bind(console, 'connection error:'));
            db.once('open', function() {
                // SCHEMA's
                exports.SharingInvitation = PSSharingInvitations.buildSchema(mongoose);
                logger.info("Mongoose: Connected to MongoDb database");
            });
            connectedDb = db;
            logger.info("Mongo: Connected to MongoDb database");
        }
    });
};
exports.db = function () {
    return connectedDb;
};
// Call this just once, when the server shuts down.
exports.disconnect = function() {
};

问题原来是这句话：

connectedDb = db;

其中db是mongoose.connection.也就是说，我使用 mongoose.connection 作为不使用 Mongoose 的 MongoDB 集合的数据库。这导致了间歇性错误。

修订后（到目前为止仍在工作！）代码如下：

exports.connect = function(mongoDbURL) {
    MongoClient.connect(mongoDbURL, function(err, db) {
        assert.equal(null, err);
        if (!db) {
            logger.error("**** ERROR ****: Cannot connect to MongoDb database!");
        }
        else {
            connectedDb = db;
            logger.info("Mongo: Connected to MongoDb database");
            mongoose.connect(mongoDbURL);
            var connectedMongooseDb = mongoose.connection;
            connectedMongooseDb.on('error', console.error.bind(console, 'connection error:'));
            connectedMongooseDb.once('open', function() {
                // SCHEMA's
                exports.SharingInvitation = PSSharingInvitations.buildSchema(mongoose);
                logger.info("Mongoose: Connected to MongoDb database");
            });
        }
    });
};