Tengo problemas para descubrir cómo agregar una subcolección a un documento en mi aplicación React. También recibo el error de que db. collection() no es una función. Estoy tratando de agregar la subcolección en la función registerWithEmailAndPassword. La documentación de Firebase Firestore no especifica cómo crear una subcolección. Cualquier ayuda será enormemente apreciada, gracias. Se ha omitido la configuración de Firebase para proteger mi clave API.

 import { initializeApp } from "firebase/app"; import { GoogleAuthProvider, getAuth, signInWithPopup, signInWithEmailAndPassword, createUserWithEmailAndPassword, sendPasswordResetEmail, signOut, } from "firebase/auth"; import { getFirestore, query, getDocs, collection, where, addDoc, Firestore, doc, DocumentReference, setDoc } from "firebase/firestore"; // TODO: Add SDKs for Firebase products that you want to use // https://firebase.google.com/docs/web/setup#available-libraries // Your web app's Firebase configuration // For Firebase JS SDK v7.20.0 and later, measurementId is optional // Initialize Firebase const app = initializeApp(firebaseConfig); const auth = getAuth(app); const db = getFirestore(app); const googleProvider = new GoogleAuthProvider(); const signInWithGoogle = async () => { try { const res = await signInWithPopup(auth, googleProvider); const user = res.user; const q = query(collection(db, "users"), where("uid", "==", user.uid)); const docs = await getDocs(q); if (docs.docs.length === 0) { await addDoc(collection(db, "users"), { uid: user.uid, name: user.displayName, authProvider: "google", email: user.email, }); } } catch (err) { console.error(err); alert(err.message); } }; const logInWithEmailAndPassword = async (email, password) => { try { await signInWithEmailAndPassword(auth, email, password); } catch (err) { console.error(err); alert(err.message); } }; const registerWithEmailAndPassword = async (name, email, password) => { try { const res = await createUserWithEmailAndPassword(auth, email, password); const user = res.user; const userDoc = await addDoc(collection(db, "users"), { uid: user.uid, name, authProvider: "local", email, }); db.collection("users").doc(userDoc.id).collection("test"); } catch (err) { console.error(err); alert(err.message); } }; const sendPasswordReset = async (email) => { try { await sendPasswordResetEmail(auth, email); alert("Password reset link sent!"); } catch (err) { console.error(err); alert(err.message); } }; const logout = () => { signOut(auth); }; export { auth, db, signInWithGoogle, logInWithEmailAndPassword, registerWithEmailAndPassword, sendPasswordReset, logout, };