From 87fe5bf1bb62402c914143076651712e050c12cf Mon Sep 17 00:00:00 2001
From: barisusakli <barisusakli@gmail.com>
Date: Wed, 21 May 2014 20:25:35 -0400
Subject: [PATCH] delete tag if it has no topics left

---
 src/controllers/tags.js | 3 +++
 src/topics/tags.js      | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/src/controllers/tags.js b/src/controllers/tags.js
index 70626e8f27..9c03cba0af 100644
--- a/src/controllers/tags.js
+++ b/src/controllers/tags.js
@@ -18,6 +18,9 @@ tagsController.getTag = function(req, res, next) {
 				return next(err);
 			}
 			data.tag = tag;
+			if (data.topics && !data.topics.length) {
+				topics.deleteTag(tag);
+			}
 			res.render('tag', data);
 		});
 	});
diff --git a/src/topics/tags.js b/src/topics/tags.js
index 275eb2dd94..a1d64dd4be 100644
--- a/src/topics/tags.js
+++ b/src/topics/tags.js
@@ -27,6 +27,11 @@ module.exports = function(Topics) {
 		db.sortedSetCard('tag:' + tag + ':topics', callback);
 	};
 
+	Topics.deleteTag = function(tag) {
+		db.delete('tag:' + tag + ':topics');
+		db.setRemove('tags', tag);
+	};
+
 	Topics.getTags = function(callback) {
 		db.getSetMembers('tags', callback);
 	};