Flutter-Firestore transform Stream<List<DocumentSnapshot<Map<String, dynamic>>>> into List<MyClass>
510
stream.listen((List<DocumentSnapshot> documentList) {
// this function would be called when ever documentList changes.
// So, it might be called even after your getClientsList() is completed.
List<Map<String, dynamic>> newResult = documentList.map((e) => e.data()).toList();
});
Since getClientsList
returns a future, you might want to convert the stream to a future. In that case, you can use this.
List<Map<String, dynamic>> newResult = (await stream.first).map((e) => e.data()).toList();
Alternatively, you can listen to the stream using a stream builder. Something like this.
StreamBuilder<DocumentSnapshot>(
stream: _geo.collection(collectionRef: collectionReference)
.within(center: center, radius: radius, field: field),
builder:
(BuildContext context, AsyncSnapshot<DocumentSnapshot> snapshot) {
if (snapshot.hasError) return Text('Something went wrong');
if (snapshot.connectionState == ConnectionState.waiting)
return CircularProgressIndicator();
List<Map<String, dynamic>> newResult = snapshot.data.data();
print(newResult);
return SizedBox();
},
)
Author by
FLTY
Updated on January 01, 2023Comments
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FLTY over 1 year
I made a function where I want to return all places in my database which are inside a radius. Thats why Im using GeoFlutterFire. My problem its that I dont know how to convert Stream<List<DocumentSnapshot<Map<String, dynamic>>>> into a List<> of my Class type.
import 'package:cloud_firestore/cloud_firestore.dart'; import 'package:geoflutterfire/geoflutterfire.dart'; import 'package:firebase_auth/firebase_auth.dart'; import 'package:firebase_storage/firebase_storage.dart'; import 'package:uerto/models/index.dart'; class SearchApi { const SearchApi({required FirebaseAuth auth, required FirebaseFirestore firestore, required FirebaseStorage storage, required Geoflutterfire geo}) : _auth = auth, _firestore = firestore, _storage = storage, _geo = geo; final FirebaseAuth _auth; final FirebaseFirestore _firestore; final FirebaseStorage _storage; final Geoflutterfire _geo; Future<List<AppClient>> getClientList() async{ final List<AppClient> newResult = <AppClient>[]; final GeoFirePoint center = _geo.point(latitude: 44.414445, longitude: 26.01135501); final CollectionReference<Map<String, dynamic>> collectionReference = _firestore.collection('clients/London/Beauty'); final double radius = 5000; const String field = 'point'; final Stream<List<DocumentSnapshot<Map<String, dynamic>>>> stream = _geo.collection(collectionRef: collectionReference).within(center: center, radius: radius, field: field); ///something to transform Stream<List<DocumentSnapshot<Map<String, dynamic>>>> stream into List<AppClient> result; newResult.addAll(result); return newResult; } }
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Micah almost 3 yearsMaybe just access a moment in the stream to grab one list at a time. Because your stream isn't a list. You could maybe chunk the stream into smaller list records, if you don't need it to stay in one object.
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pskink almost 3 yearssee
Stream.first
property for example - the docs say: "The first element of this stream. Stops listening to this stream after the first element has been received."
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