// I only have one document in the database
GeoFlutterfire()
        .collection(
            collectionRef: Firestore.instance.collection('countries'))
        .within(
            center: GeoFirePoint(45.208794, -133.5497394),
            radius: 50000,
            field: "location",
            strictMode: true).listen((snapshots){
int count = snapshots.length; // snapshots has two items of the same document.
});