Firebase Firestore 显示警告

Question

我正在做一个使用 ionic 3 和 firebase firestore 作为数据库的项目。

但是每当我进行 CRUD 操作时，我的 firebase firestore 都会显示警告。

 index.esm.js:77 [2018-05-02T05:45:40.408Z]  @firebase/firestore: 
 Firestore (4.13.0): 
 The behavior for Date objects stored in Firestore is going to change
 AND YOUR APP MAY BREAK.
 To hide this warning and ensure your app does not break, you need to 
 add the
 following code to your app before calling any other Cloud Firestore 
 methods:

 const firestore = firebase.firestore();
 const settings = {/* your settings... */ timestampsInSnapshots: 
 true};
 firestore.settings(settings);

 With this change, timestamps stored in Cloud Firestore will be read 
 back as
 Firebase Timestamp objects instead of as system Date objects. So you 
 will also
 need to update code expecting a Date to instead expect a Timestamp. 
 For example:

 // Old:
 const date = snapshot.get('created_at');
 // New:
 const timestamp = snapshot.get('created_at');
 const date = timestamp.toDate();

 Please audit all existing usages of Date when you enable the new 
 behavior. In a
 future release, the behavior will change to the new behavior, so if 
 you do not
 follow these steps, YOUR APP MAY BREAK.

Answer 1

我在 app.module.ts 中添加了以下代码，然后错误更正。
firebase.initializeApp(environment.firebase)//加载 firebase 服务器设置

firebase.firestore().settings( { timestampsInSnapshots: true })