get data from firebase firestore

1    db.collection("users").get().then((querySnapshot) => {
2    querySnapshot.forEach((doc) => {
3        console.log(`${doc.id} => ${doc.data()}`);
4    });
5

1useEffect(() => {
2	db.collection('posts')
3      .orderBy('timestamp', 'asc') // optional
4      .onSnapshot((snapshot) => {
5		setPosts(
6			snapshot.docs.map((doc) => {
7				return doc.data();
8			})
9		);
10	});
11}, []);

1//retrieve one document and save it to userDetails
2const [userDetails, setUserDetails] = useState('')
3db.collection('users').doc(id).get()
4        .then(snapshot => setUserDetails(snapshot.data()))

1const [hospitalsDetails, setHospitalsDetails] = useState([])
2    useEffect(()=>{
3        //load hospitals into hospitalsList
4        const hospitals = []
5        db.collection('Hospitals').get()
6            .then(snapshot => {
7                snapshot.docs.forEach(hospital => {
8                    let currentID = hospital.id
9                    let appObj = { ...hospital.data(), ['id']: currentID }
10                    hospitals.push(appObj)
11
12                    hospitals.push(hospital.data())
13            })
14            setHospitalsDetails(hospitals)
15        })
16    },[])
17