firestore get all documents in collection
// retrieve a collection
db.collection('documents')
.get()
.then(querySnapshot => {
const documents = querySnapshot.docs.map(doc => doc.data())
// do something with documents
})
// retrieve a document
db.collection('documents')
.doc(documentId)
.get()
.then(snapshot => {
const document = snapshot.data()
// do something with document
})read data firestore java
DocumentReference docRef = db.collection("cities").document("SF");
docRef.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
@Override
public void onComplete(@NonNull Task<DocumentSnapshot> task) {
if (task.isSuccessful()) {
DocumentSnapshot document = task.getResult();
if (document.exists()) {
Log.d(TAG, "DocumentSnapshot data: " + document.getData());
} else {
Log.d(TAG, "No such document");
}
} else {
Log.d(TAG, "get failed with ", task.getException());
}
}
});get data in from a collection firestore
db.collection("users").get().then((querySnapshot) => {
querySnapshot.forEach((doc) => {
console.log(`${doc.id} => ${doc.data()}`);
});collection get firesotre
async getMarker() {
const snapshot = await firebase.firestore().collection('events').get()
return snapshot.docs.map(doc => doc.data());
}get one document based on id in firestore
//retrieve one document and save it to userDetails
const [userDetails, setUserDetails] = useState('')
db.collection('users').doc(id).get()
.then(snapshot => setUserDetails(snapshot.data()))get data from firestore
const [hospitalsDetails, setHospitalsDetails] = useState([])
useEffect(()=>{
//load hospitals into hospitalsList
const hospitals = []
db.collection('Hospitals').get()
.then(snapshot => {
snapshot.docs.forEach(hospital => {
let currentID = hospital.id
let appObj = { ...hospital.data(), ['id']: currentID }
hospitals.push(appObj)
hospitals.push(hospital.data())
})
setHospitalsDetails(hospitals)
})
},[])Copyright © 2021 Codeinu
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