将所有数组对象(firestore时间戳)转换为日期 [英] convert all array object(firestore timestamp) to date

问题描述

我正在使用firestore和react-native-gifted-chat，我正在尝试将所有聊天消息从firestore传递到聊天室.但是，有条件的聊天不支持显示Firebase时间戳.它将显示无效的日期.因此，我正在尝试转换所有日期对象.

I am using firestore and react-native-gifted-chat, I am trying to get all the chat messages from firestore to the chat. However, gifted chat does not support displaying firebase timestamp. It will show invalid Date. Therefore, I m trying to convert all the date object.

async _getMessage() {
  const messColRef = db.collection('Message').doc(this.state.roomName).collection('message').orderBy('createdAt', 'desc').limit(9)
  const initialQuery = messColRef
  const documentSnapshots = await initialQuery.get()
  const documentData = documentSnapshots.docs.map(document => ({
    id: document.id, ...document.data()
  }));
  const lastVisible = documentData[documentData.length - 1]

  const finalData = _.forEach(documentData['createdAt'], (item) => {
    return item.toDate()
  });
  console.log(documentData)
}

这就是我的数据的样子:

and it is how my data look like:

{
  "_id": "f0feb0b6-c0f9-4735-a93d-4297872a4840",
    "createdAt": Timestamp {
    "nanoseconds": 382000000,
      "seconds": 1568995812,
 },
  "id": "Uw6PNNsf7aqWrxcgSDSi",
    "text": "Hi",
      "user": {
    "_id": "V8h2iSllhPXSr8sTGP0yHiaYZwx1",
      "avatar": "https://firebasestorage.googleapis.com/v0/b/exit-3684f.appspot.com/o/add- 
    user.png ? alt = media & token=395c8beb - 47a3 - 4ae6 - a0a1 - fe901e7ad42f",
    "name": "This is the username",
 },
},
{
  "_id": "cc298d96-f19a-4ec7-bdf7-3767d900a364",
    "createdAt": Timestamp {
    "nanoseconds": 373000000,
      "seconds": 1568995733,
 },
  "id": "WzbOA52Y3qukvPUIXRLB",
    "text": "hello",
      "user": {
    "_id": "V8h2iSllhPXSr8sTGP0yHiaYZwx1",
      "avatar": "https://firebasestorage.googleapis.com/v0/b/exit-3684f.appspot.com/o/add- 
    user.png ? alt = media & token=395c8beb - 47a3 - 4ae6 - a0a1 - fe901e7ad42f",
    "name": "This is the username",
    },
},

所以我的目标是将所有createdAt转换为js时间日期

so my goal is to convert all the createdAt to js time date

推荐答案

使用礼物聊天的renderTime属性，并传递一个函数，该函数可以转换时间并以字符串形式返回该时间.

Use renderTime prop of gifted chat and pass a function which converts the time and return that time in a string.

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