I am following along with a tutorial in which using Firestore to retrieve data from a collection. there two major things: retrieve DOCUMENT and COLLECTION that's nested inside that DOCUMENT. My code down below is based on FireStore web v8, and I want to convert it to web version 9. I found it very complicated !
useEffect(()=>{
if(roomId){
db.collection('rooms').doc(roomId).onSnapshot(snapshot => {
setRoomName(snapshot.data().name);
});
db.collection('rooms').doc(roomId).collection("messages").orderBy("timestamp","asc").onSnapshot(snapshot => {
setMessages(snapshot.docs.map(doc => doc.data()))
});
}
},[roomId])
Try this:
import { collection, query, where, doc, onSnapshot } from "firebase/firestore";
useEffect(() => {
onSnapshot(doc(db, "rooms", roomId), (doc) => {
setRoomName(doc.data().name)
});
const q = query(collection(db, "rooms", roomId, "messages"), orderBy("timestamps"));
onSnapshot(q, (querySnapshot) => {
setMessages(querySnapshot.docs.map(doc => doc.data()))
});
}, [roomId])
Also checkout:
This one should do the job !
useEffect(() => {
if(roomId){
onSnapshot(doc(db, "rooms", roomId), (document) =>{
setRoomName(document.data().name);
});
const msgColl = query(collection(db, "rooms", roomId, "messages"), orderBy("timestamp"));
onSnapshot(msgColl, (querySnapshot) => {
setMessages(querySnapshot.docs.map(msg => msg.data()))
});
}
}, [roomId])
This is just for others....
V8:
export const fetchAccountAssets = (userID, accountID) => db()
.collection('Accounts')
.doc(userID)
.collection('Assets')
.get()
.then((querySnapshot) => querySnapshot);
V9:
export const fetchAccountAssets = async (userID, accountID) => {
return await getDocs(collection(db, 'Accounts', userID, 'Assets'));
}
I dont think I need to await here but oh well..