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>

条件是在使用MongoDB执行查找操作时ObjectID的一些用法。 ObjectID的一些用法引发了这个错误，有些则没有。唯一重要的是ObjectID的来源。如果它是从现有的集合中提取的，那就有效了。如果我自己生成它（例如，使用ObjectID.createFromHexString），它就会失败，如上所述。

Answer 1

将mongodb版本更改为2.1.6。

Answer 2

我花了几个小时跟踪这个。问题归结于我对Mongoose的使用。我正在使用Mongoose模式来处理我的一些收藏，而不是将Mongoose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() {
};

问题结果是：

connectedDb = db;

db是mongoose.connection。也就是说，我使用mongoose.connection作为我的数据库，用于未使用Mongoose的MongoDB集合。这导致间歇性错误。

修订后的（以及迄今为止的工作！）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");
            });
        }
    });
};

“Argument必须是一个字符串”，其中包含Node.js中的某些MongoDB ObjectID

2 个答案: