allow multiple tags

src/categories/topics.js

@@ -125,7 +125,7 @@ module.exports = function (Categories) {
 				if (parseInt(pinned, 10) === 1) {
 					return setImmediate(next);
 				}
-				 
+
 				async.parallel([
 					function (next) {
 						db.sortedSetAdd('cid:' + cid + ':tids', postData.timestamp, postData.tid, next);
@@ -135,11 +135,11 @@ module.exports = function (Categories) {
 					}
 				], function (err) {
 					next(err);
-				});					
+				});
 			},
 			function (next) {
 				Categories.updateRecentTid(cid, postData.tid, next);
-			}			
+			}
 		], callback);
 	};
 

src/controllers/category.js

@@ -111,7 +111,13 @@ categoryController.get = function (req, res, callback) {
 					}
 
 					if (req.query.tag) {
-						payload.set = [payload.set, 'tag:' + req.query.tag + ':topics'];
+						if (Array.isArray(req.query.tag)) {
+							payload.set = [payload.set].concat(req.query.tag.map(function (tag) {
+								return 'tag:' + tag + ':topics';
+							}));
+						} else {
+							payload.set = [payload.set, 'tag:' + req.query.tag + ':topics'];
+						}
 					}
 					categories.getCategoryById(payload, next);
 				}