Problem when add data in Subcollection Firebase v9

Question

await addDoc(collection(db, 'users', idDoc, 'notes'), {
    title: noteTitle,
    body: 'comentario por defecto.',
    timestamp: serverTimestamp(),
});

When I trying to add data in my sub collection 'notes'. Appear this mistake, I don't know what is happening because I using the same code reference in Firebase v9 Documentation.

Extra Note: idDoc returns me: YYwcNWMfznuwAB8eN0sU

Answer 1

It seems you were in the right direction but I would recommend checking how to reference subcollections and then using that reference to write data into it.

It won't hurt to check your imports and dependencies as well.

 import { doc } from "firebase/firestore"; const messageRef = doc(db, "rooms", "roomA", "messages", "message1");

This translated to your project would be:

const notesRef = doc(db, 'users', idDoc, 'notes'); 

---

Next, you need to check the Add a document section as well. The code you are using as a reference applied to your app would create a new note with an auto-generated id. In the reference, "cities" would correspond to your "notes" reference.

Finally, if you substitute this, it would look like this:

const noteRef = await addDoc(collection(db, notesRef), {
    title: noteTitle,
    body: 'comentario por defecto.',
    timestamp: serverTimestamp() // You also had an extra coma here
});
console.log("Note written with ID: ", noteRef.id);

The console log is optional

Answer 2

you use await first see async function is nesscesssry

addDoc(collection(db, 'Institute', 'Private', 'College'), { name:"tunio" })

this is working for me

Answer 3

try this one for add subcollections in firebase v9

`function uploadData() {
    var id = 'id_' + Math.random().toString(36).substring(2) + (new Date()).getTime().toString(36); //create id for uniqness

    setDoc(doc(db, "Institute", `college`, `city`, `${id}`), {
        Name: "CAted college"
    })}`

//if you not use id set primary as name then no need to use id only write "name" of sugeesttion that unique for data base instead of id