added tag counts to api return

src/database/level/sorted.js

@@ -113,6 +113,10 @@ module.exports = function(db, module) {
 		});
 	};
 
+	module.sortedSetsCard = function(keys, callback) {
+		async.map(keys, module.sortedSetCard, callback);
+	};
+
 	module.sortedSetRank = function(key, value, callback) {
 		module.getListRange(key, 0, -1, function(err, list) {
 			for (var i = 0, ii=list.length; i< ii; i++) {

src/database/mongo/sorted.js

@@ -101,6 +101,10 @@ module.exports = function(db, module) {
 		});
 	};
 
+	module.sortedSetsCard = function(keys, callback) {
+		async.map(keys, module.sortedSetCard, callback);
+	};
+
 	module.sortedSetRank = function(key, value, callback) {
 		getSortedSetRank(module.getSortedSetRange, key, value, callback);
 	};

src/database/redis/sorted.js

@@ -51,6 +51,17 @@ module.exports = function(redisClient, module) {
 		redisClient.zcard(key, callback);
 	};
 
+	module.sortedSetsCard = function(keys, callback) {
+		if (Array.isArray(keys) && !keys.length) {
+			return callback(null, []);
+		}
+		var multi = redisClient.multi();
+		for(var i=0; i<keys.length; ++i) {
+			multi.zcard(keys[i]);
+		}
+		multi.exec(callback);
+	};
+
 	module.sortedSetRank = function(key, value, callback) {
 		redisClient.zrank(key, value, callback);
 	};

src/topics/tags.js

@@ -5,6 +5,7 @@ var async = require('async'),
 	winston = require('winston'),
 	db = require('../database'),
 	meta = require('../meta'),
+	_ = require('underscore'),
 	plugins = require('../plugins'),
 	utils = require('../../public/src/utils');
 
@@ -87,8 +88,8 @@ module.exports = function(Topics) {
 	};
 
 	Topics.getTopicTagsObjects = function(tid, callback) {
-		Topics.getTopicTags(tid, function(err, tags) {
+		Topics.getTopicsTagsObjects([tid], function(err, data) {
-			callback(err, mapToObject(tags));
+			callback(err, Array.isArray(data) && data.length ? data[0] : []);
 		});
 	};
 
@@ -102,21 +103,34 @@ module.exports = function(Topics) {
 				return callback(err);
 			}
 
+			var uniqueTags = _.uniq(_.flatten(members));
+			var tagTopicSets = uniqueTags.map(function(tag) {
+				return 'tag:' + tag + ':topics';
+			});
+
+			db.sortedSetsCard(tagTopicSets, function(err, data) {
+				if (err) {
+					return callback(err);
+				}
+				var tagCounts = _.object(uniqueTags, data);
+
 				members.forEach(function(tags, index) {
 					if (Array.isArray(tags)) {
-					members[index] = mapToObject(tags);
+						members[index] = mapToObject(tags, tagCounts);
 					}
-			})
+				});
 				callback(null, members);
 			});
+		});
 	};
 
-	function mapToObject(tags) {
+	function mapToObject(tags, tagCounts) {
 		if (!tags) {
 			return tags;
 		}
+
 		return tags.map(function(tag) {
-			return {name: tag};
+			return {name: tag, score: tagCounts ? tagCounts[tag] : 0};
 		});
 	}