whereWithinKilometers method
Returns an object with key point values near the point given and within the maximum distance given.
Implementation
void whereWithinKilometers(
String column, ParseGeoPoint point, double maxDistance) {
final double latitude = point.latitude;
final double longitude = point.longitude;
queries.add(MapEntry<String, dynamic>(_singleQuery,
'"$column":{"\$nearSphere":{"__type":"GeoPoint","latitude":$latitude,"longitude":$longitude},"\$maxDistanceInKilometers":$maxDistance}'));
}