mongodb, sorting by geoNear and date?

Question

how to sort by proximity and date in mongoDB? I tried this. But they just sort by date:

   coll.find({\'date\':{$gte:date},\'location\':{$nearSphere:[lat,lng]}})         


        

Answer 1

There's no direct way to use $near or $nearSphere and sort by another field, because both of these operators already sort the results of doing a find(). When you sort again by 'date', you're re-sorting the results. What you can do, however, is grab results from the $nearSphere incrementally, and sort each set of results. For example:

function sortByDate(a, b) { return a.date - b.date; }

// how many results to grab at a time
var itersize = 10;
// this will hold your final, two-way sorted results
var sorted_results = new Array();
for (var i=0, last=db.coll.count(); i

You should also be aware of the order you specify geospatial coordinates in mongodb queries. MongoDB uses the geojson spec, which does coordinates in X, Y, Z order (i.e., longitude, latitude).