random.js

// implementation of random queries using Parse Cloud Code
// see https://parse.com/questions/random-search-its-possibile for setup details

Parse.Cloud.define('randomNouns', function(request, response) {
  var NounMaster = Parse.Object.extend("NounMaster");
  var maxQuery = new Parse.Query(NounMaster);
  maxQuery.first({
    success: function(object) {
      var max = object.get("nextWordIndex");
      var n = 10;
      if(request.params.count) { n = request.params.count; }
      var arr = [];
      while (arr.length < n) {
        arr.push(Math.ceil(Math.random() * max));
      }
      var indexes = arr;
      var Noun = Parse.Object.extend("Noun");
      var nounQuery = new Parse.Query(Noun);
      nounQuery.containedIn("index", indexes);
      nounQuery.find({
        success: function(results) { 
          response.success(results); 
        }
      });
    }
  });
});