'firestore keyword working in the code in flutter

Hi guys i am trying write firestore.instance but it give error. I can not under stand why this error occur in the below code.

  void _fetchMarkersFromDb() {
    // TODO: improve this
    print('_fetchMarkersFromDb() called');

    ***Firestore***.instance.collection('markers').getDocuments().then((docs) async {
      final docLength = docs.documents.length;
      final clients = List(docLength);
      for (int i = 0; i < docLength; i++) {
        clients[i] = docs.documents[i];
      }
      if (!isFirstCycle && isMyMarkerFetched) {
        currentLocation = await Geolocator.getCurrentPosition();
      }
      _populateMarkers(clients);
    });
  }

enter image description here

firebase flutter

Solution 1:^[1]

Use FirebaseFirestore instead.

Like:

FirebaseFirestore.instance.collection('markers').get().then((value) async {
 var docs = value.docs;
 final docLength = docs.length;
 final clients = List(docLength);
 for (int i = 0; i < docLength; i++) {
    clients[i] = docs[i];
 }
 if (!isFirstCycle && isMyMarkerFetched) {
    currentLocation = await Geolocator.getCurrentPosition();
  }
 _populateMarkers(clients);
});

To delete a document use:

FirebaseFirestore.instance.collection('markers').doc(documentId).delete()

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Solution 1

'firestore keyword working in the code in flutter

Solution 1:[1]

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Solution 1:^[1]