MongoDB query setup

function lookForNearPlaces (collection, longitude, latitude, maxDistance, minDistance, query) {
  
  var maxDistance = maxDistance ? maxDistance : 50;
  var minDistance = minDistance ? minDistance : 0;

  var nearQueryDocument = {
        near: { type: "Point", coordinates: [ longitude , latitude ] },
        distanceField: "dist.calculated",
        maxDistance: maxDistance,
        minDistance: minDistance,
        includeLocs: "dist.location",
        spherical: true};

  if (query) 
    nearQueryDocument.query = query;
  
  return db[collection].aggregate([{ $geoNear: nearQueryDocument }]);
}

db.system.js.save(
    {
      _id: "proximityQuery",
      value: lookForNearPlaces
 });