gistfile1.js

Parse.Cloud.define("NearByAds", nearByAds);
Parse.Cloud.define("myAds", myAds);

var locationUtil = require('cloud/latlon.js');

/*
 * limit is kInitialObjectsPerPageNum(100)
 * oredered by descending adDate and createdAt
 * kSpecialPropertyKeyApproved(approved) is YES
 * kSpecialPropertyKeyDeleted(deleted) is NO
 * not showing ads with price under 100
 *
 * params:
 * kSpecialPropertyKeyUserID(userID)
 * location_lat, location_long for kSpecialPropertyKeyLocation(location)
 */
function nearByAds(request, response)
{
    var distance = 3;
    nearByAdsHelper(request,response,distance);
}

function nearByAdsHelper(request,response,distance)
{
    var query = baseQuery(request,distance);
    query.find({
               success:function(results){
               //console.log('\ndistance:'+distance+' results:'+results.length);
               //distance backoff in case of less then 50 ads with fallback if less than 4 km
               if(results.length < 200 && distance < 4){
                  nearByAdsHelper(request,response,Math.pow(distance,1.15));
                  return;
               }
               
               //'great finds' are given preferred sorting, they go to 1/4 of the sort.
               //'LIKE' go to 1/2 of the sort order
               for(var i = 0; i<results.length; i++){
                              if(results[i].get('ribbon')=='GREAT_FIND'){
                                             results.insert(i/4,results.remove(i).pop());
                              }else if(results[i].get('ribbon')=='LIKE'){
                                             results.insert(i/2,results.remove(i).pop());
                              }
               }
                              response.success(results.slice(0,100));
               },
               error: function(error) {
                              response.error(error);
               }
               });
}

function baseQuery(request,distance)
{
    var mainQuery = new Parse.Query("Ad");
    mainQuery.limit = 200;
    mainQuery.descending("createdAt");
    mainQuery.equalTo("approved",true);
    mainQuery.equalTo("deleted",false);
    mainQuery.notEqualTo("visible_in_feed",false);
    mainQuery.greaterThanOrEqualTo("price",80);
    
    
    mainQuery.notEqualTo("userID",request.params.userID);
    
    if(request.params.location_lat!='-1' || request.params.location_long != '-1'){//only if valid location
        var location = new locationUtil.LatLon(request.params.location_lat,request.params.location_long);
        //gets a relative geopoint by 225 degrees and 4.1km distance
        var southwest = location.destinationPoint(225,distance);
        var northeast = location.destinationPoint(45,distance);;
        
        mainQuery.withinGeoBox("location",
                               new Parse.GeoPoint(southwest.lat(), southwest.lon()),
                               new Parse.GeoPoint(northeast.lat(), northeast.lon()));
    }
    return mainQuery;
}

/*
 * limit is kInitialObjectsPerPageNum(100)
 * oredered by descending adDate and createdAt
 *
 * params:
 * kSpecialPropertyKeyUserID(userID)
 */
function myAds(request, response)
{
    var mainQuery = new Parse.Query("Ad");
    mainQuery.limit = 100;
    mainQuery.descending("createdAt");
    mainQuery.equalTo("deleted",false);
    
    mainQuery.equalTo("userID",request.params.userID);
    mainQuery.find({
                   success:function(results){
                   response.success(results);
                   },
                   error: function(error) {
                   response.error(error);
                   }
                   });
}

Array.prototype.insert = function (index, item) {
    this.splice(index, 0, item);
};

Array.prototype.remove = function (index) {
    return this.splice(index, 1);
};