node.js - Mongoose promise 错误

Question

这是添加原生promise后保存时仍然抛出的错误。

(node:5604) DeprecationWarning: Mongoose: mpromise (mongoose's default promise library) is deprecated, plug in your own promise library instead: http://mongoosejs.com/docs/promises.html

mongoose.Promise = global.Promise;
mongoose.connect('mongodb://127.0.0.1/optimusCP')
    .then(function () {
        console.log('Connected to MONGOD !!');
    }).catch(function (err) {
        console.log('Failed to establish connection with MONGOD !!');
        console.log(err.message);
    });

我已尝试过 bluebird 和 q，但仍未找到解决此问题的方法。以下是我保存时的代码，出现以下弃用警告..

var user = new User();
        user.email = req.body.email;
        user.password = hash;
        user.save()
            .then(function (user) {
                console.log(user);
            })
            .catch(function (err) {
                console.log(err);
            });

This error is happening on the new version of mongoose which is 4.8.1, but working fine on 4.7.6 mongoose version.

Answer 1

尽管在 mongoose.connect(...) 之前使用了 mongoose.Promise = global.Promise;，但我收到了同样的警告。

我发现，我在一个文件中初始化了 mongoose 连接:

import mongoose from 'mongoose';

...

// Connect to MongoDB
mongoose.Promise = global.Promise;
mongoose.connect(mongoUri, mongoOptions);
mongoose.connection.on('error', (err) => {
  console.error(`MongoDB connection error: ${err}`);
  process.exit(1);
});

但我也在另一个文件中导入了 mongoose(其中描述了 mongoose 方案)，所以我也在第二个文件中添加了 mongoose.Promise = global.Promise;，如结果，警告消失了。

import mongoose, { Schema } from 'mongoose';
mongoose.Promise = global.Promise;

const UserSchema = new Schema({ ... });

可能你也有同样的情况。