mongoose mpromise被废弃警告，(node:3341) DeprecationWarning: Mongoose: mpromise (mongoose's default promis

来源：http://majing.io/questions/540

用mongoose提示mpromise已被废弃

(node:3341) DeprecationWarning: Mongoose: mpromise (mongoose's default promise library) is deprecated, plug in your own promise library instead: http://mongoosejs.com/docs/promises.html
问题解决

Mongoose 做异步操作时，为了向后兼容，Mongoose 4 默认使用mpromise 作为返回值。mpromise已被废弃，推荐使用 ES6风格的 promises库或者ES6原生的Promise库
调用mongoose.connect使用Promise方式
原生的ES6 Promise

mongoose.Promise = global.Promise;
mongoose.connect('mongodb://localhost:27107/data/db');

bluebird promise

var uri = 'mongodb://localhost:27017/data/db';
var options = { promiseLibrary: require('bluebird') };
var db = mongoose.createConnection(uri, options);

参考Mongoose Promise