node.js - DeprecationWarning : `open()` is deprecated in mongoose >= 4. 11.0，使用 `openUri()`代替，或者设置 `useMongoClient`

Question

我在 Node.js 项目中使用 MongoDB，当我在项目中运行 node app.js 时，出现如下问题:

DeprecationWarning: open() is deprecated in mongoose >= 4.11.0，use openUri() instead, or set the useMongoClient option if using connect() or createConnection()

我的核心代码:

var mongoose = require('mongoose')
mongoose.connect('mongodb://localhost/test');
var db = mongoose.connection

db.on('error', console.error.bind(console, 'connect error:'));
db.once('open', function() {
    console.log('connect success');
})

Answer 1

来自http://mongoosejs.com/docs/connections.html :

const options = {
  useMongoClient: true,
  autoIndex: false, // Don't build indexes
  reconnectTries: Number.MAX_VALUE, // Never stop trying to reconnect
  reconnectInterval: 500, // Reconnect every 500ms
  poolSize: 10, // Maintain up to 10 socket connections
  // If not connected, return errors immediately rather than waiting for reconnect
  bufferMaxEntries: 0
};
mongoose.connect(uri, options);

连接mongodb时，应添加{useMongoClient:true}:

mongoose.connect('mongodb://localhost/test',{useMongoClient:true})