On Update value of firestore document
Question
I am trying to make a chat app as a learning project. when i am trying to run
firebase.functions.firestore
.document('messages/lastMessage')
.onUpdate((snapshot, context) => {
const after = snapshot.after.data();
console.log(after)
})
i am getting this error: Uncaught TypeError: Cannot read property 'document' of undefined
this is how i am importing firebase into my html:
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Instter</title>
<script:scr="https://www.gstatic.com/firebasejs/8.0.2/firebase.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.7.0/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.7.0/firebase-functions.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.7.0/firebase-firestore.js"></script>
</head>
<body>
<script src="index.js"></script>
</body>
I have tried searching everywhere but didn't found anything. please let me know if you know something about this. Thank you
1 answers
solution1
1 2021-07-08 12:32:57
It seems like you are trying to run the functions in your web app. You must initialize Cloud Functions using the CLI in your project directory. Create a new directory (or use existing Firebase project directory) and run the following command:
firebase init functions
Go through the setup and you'll get a directory structure similar to this (will be slightly different for Javascript and Typescript):
Then in your index.ts (or .js ) file:
import * as functions from "firebase-functions";
export const firestoreTrigger = functions.firestore.document("/messages/{lastMessage}").onUpdate((change, context) => {
const lastMessage = change.after.data().lastMessage;
console.log(lastMessage);
return;
});
You can write your functions in them. To deploy, run the firebase deploy --only functions command.
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