import { collection, addDoc } from 'firebase/firestore';

try {
  const docRef = await addDoc(collection(db, 'users'), {
    first: 'Ada',
    last: 'Lovelace',
    born: 1815,
  });
  console.log('Document written with ID: ', docRef.id);
} catch (e) {
  console.error('Error adding document: ', e);
}

import { collection, getDocs } from 'firebase/firestore';

const querySnapshot = await getDocs(collection(db, 'users'));
querySnapshot.forEach((doc) => {
  console.log(`${doc.id} => ${doc.data()}`);
});

import { doc, setDoc } from 'firebase/firestore';

// Add a new document in collection "cities"
await setDoc(doc(db, 'cities', 'LA'), {
  name: 'Los Angeles',
  state: 'CA',
  country: 'USA',
});

await setDoc(doc(db, 'cities', 'new-city-id'), data);

import { doc, updateDoc } from 'firebase/firestore';

const washingtonRef = doc(db, 'cities', 'DC');

// Set the "capital" field of the city 'DC'
await updateDoc(washingtonRef, {
  capital: true,
});

import { updateDoc, serverTimestamp } from 'firebase/firestore';

const docRef = doc(db, 'objects', 'some-id');

// Update the timestamp field with the value from the server
const updateTimestamp = await updateDoc(docRef, {
  timestamp: serverTimestamp(),
});

import { doc, getDoc } from 'firebase/firestore';

const docRef = doc(db, 'cities', 'SF');
const docSnap = await getDoc(docRef);

if (docSnap.exists()) {
  console.log('Document data:', docSnap.data());
} else {
  // doc.data() will be undefined in this case
  console.log('No such document!');
}

import { doc, onSnapshot } from 'firebase/firestore';

const unsub = onSnapshot(doc(db, 'cities', 'SF'), (doc) => {
  console.log('Current data: ', doc.data());
});