added getSortedSetRevUnion... just because.

src/database/redis/sorted.js

@@ -75,6 +75,18 @@ module.exports = function(redisClient, module) {
 	};
 
 	module.getSortedSetUnion = function(sets, start, stop, callback) {
+		var args = Array.prototype.slice.call(arguments, 0);
+		args.unshift(null);
+		sortedSetUnion.apply(null, args);
+	}
+
+	module.getSortedSetRevUnion = function(sets, start, stop, callback) {
+		var args = Array.prototype.slice.call(arguments, 0);
+		args.unshift(true);
+		sortedSetUnion.apply(null, args);
+	}
+
+	var	sortedSetUnion = function(rev, sets, start, stop, callback) {
 		// start and stop optional
 		if (typeof start === 'function') {
 			callback = start;
@@ -92,7 +104,7 @@ module.exports = function(redisClient, module) {
 		sets.unshift('temp');
 
 		multi.zunionstore.apply(multi, sets);
-		multi.zrange('temp', start, stop);
+		multi[rev ? 'zrevrange' : 'zrange']('temp', start, stop);
 		multi.del('temp');
 		multi.exec(function(err, results) {
 			if (!err && typeof callback === 'function') {

tests/database.js

@@ -330,6 +330,12 @@ describe('Test database', function() {
 			});
 		}
 
+		function getSortedSetRevUnion(callback) {
+			db.getSortedSetUnion(['users:joindate', 'users:derp', 'users:postcount'], function(err, data) {
+				callback(err, {'sortedSetUnion': data});
+			});
+		}
+
 		var sortedSetTasks = [
 			sortedSetAdd,
 			sortedSetAdd,
@@ -344,7 +350,8 @@ describe('Test database', function() {
 			sortedSetScore,
 			sortedSetsScore,
 			getSortedSetRevRangeByScore,
-			getSortedSetUnion
+			getSortedSetUnion,
+			getSortedSetRevUnion
 		];
 
 		async.series(sortedSetTasks, function(err, results) {