Kinvey JavaScript Library: Leaderboard example.

gistfile1.js

var collection = new Kinvey.Collection('scores', {
  store: 'cached',
  options: { policy: 'cachefirst' }
});

// The leaderboard should override the collections cachefirst policy.
var leaderboard = new Kinvey.Aggregation().on('player');
collection.aggregate(leaderboard, {
  policy: 'nocache',// Overrides cachefirst policy.
  success: function(response) {
    // response is the leaderboard.
  }
});