faster getTeasers

src/topics.js

@@ -155,7 +155,7 @@ var async = require('async'),
 
 			async.parallel({
 				teasers: function(next) {
-					Topics.getTeasers(tids, next);
+					Topics.getTeasers(topics, next);
 				},
 				users: function(next) {
 					user.getMultipleUserFields(uids, ['uid', 'username', 'userslug', 'picture'], next);

src/topics/teaser.js

@@ -12,15 +12,11 @@ var async = require('async'),
 
 module.exports = function(Topics) {
 
-	Topics.getTeasers = function(tids, callback) {
-		if (!Array.isArray(tids) || !tids.length) {
+	Topics.getTeasers = function(topics, callback) {
+		if (!Array.isArray(topics) || !topics.length) {
 			return callback(null, []);
 		}
 
-		Topics.getTopicsFields(tids, ['postcount', 'teaserPid'], function(err, topics) {
-			if (err) {
-				return callback(err);
-			}
 		var counts = [];
 		var teaserPids = [];
 
@@ -42,7 +38,6 @@ module.exports = function(Topics) {
 				return array.indexOf(uid) === index;
 			});
 
-
 			user.getMultipleUserFields(uids, ['uid', 'username', 'userslug', 'picture'], function(err, usersData) {
 				if (err) {
 					return callback(err);
@@ -59,21 +54,34 @@ module.exports = function(Topics) {
 					tidToPost[post.tid] = post;
 				});
 
-					var teasers = tids.map(function(tid, index) {
-						if (tidToPost[tid]) {
-							tidToPost[tid].index = counts[index];
+				var teasers = topics.map(function(topic, index) {
+					if (tidToPost[topic.tid]) {
+						tidToPost[topic.tid].index = counts[index];
 					}
-						return tidToPost[tid];
+					return tidToPost[topic.tid];
 				});
 
 				callback(null, teasers);
 			});
 		});
-		});
+	};
+
+	Topics.getTeasersByTids = function(tids, callback) {
+		if (!Array.isArray(tids) || !tids.length) {
+			return callback(null, []);
+		}
+		async.waterfall([
+			function(next) {
+				Topics.getTopicsFields(tids, ['tid', 'postcount', 'teaserPid'], next);
+			},
+			function(topics, next) {
+				Topics.getTeasers(topics, next);
+			}
+		], callback);
 	};
 
 	Topics.getTeaser = function(tid, callback) {
-		Topics.getTeasers([tid], function(err, teasers) {
+		Topics.getTeasersByTids([tid], function(err, teasers) {
 			callback(err, Array.isArray(teasers) && teasers.length ? teasers[0] : null);
 		});
 	};