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MongoClient.connect()時にuseNewUrlParserオプションを与える

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Node.jsでMongoDBの接続を得るときにこんなエラーが出たときの対処法メモ。

(node:2368) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.

エラーメッセージに従い、{useNewUrlParser: true}を第二引数に与える。

async connect() {
  if(this.conn) {
    return this.conn;
  } else {
    this.client = await MongoClient.connect(this.url, {useNewUrlParser: true});
    this.conn = this.client.db();
    return this.conn;
  }
}

同じこと書いてる人が海外にいた。
https://www.thanhphu.tech/2018/05/23/about-mongos-usenewurlparser-warning/

mimizq
Javaを7年やってPHP2年生。Node.jsもちょっと。PHPのぬるさにびっくりしている。わりと有名なサービスやってる会社のあんまり有名じゃないほうのサービス担当。
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