From fb7f10d63d35a12e2ab96168aac1532c50c82e2e Mon Sep 17 00:00:00 2001
From: barisusakli <barisusakli@gmail.com>
Date: Tue, 3 Nov 2015 12:27:15 -0500
Subject: [PATCH] closes #3821

---
 src/topics/fork.js | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/topics/fork.js b/src/topics/fork.js
index aefb2a88cd..fa4633fdd6 100644
--- a/src/topics/fork.js
+++ b/src/topics/fork.js
@@ -103,6 +103,9 @@ module.exports = function(Topics) {
 			},
 			function(next) {
 				async.parallel([
+					function(next) {
+						updateCategoryPostCount(postData.tid, tid, next);
+					},
 					function(next) {
 						Topics.decreasePostCount(postData.tid, next);
 					},
@@ -132,6 +135,24 @@ module.exports = function(Topics) {
 		});
 	};
 
+	function updateCategoryPostCount(oldTid, tid, callback) {
+		Topics.getTopicsFields([oldTid, tid], ['cid'], function(err, topicData) {
+			if (err) {
+				return callback(err);
+			}
+			if (!topicData[0].cid || !topicData[1].cid) {
+				return callback();
+			}
+			if (parseInt(topicData[0].cid, 10) === parseInt(topicData[1].cid, 10)) {
+				return callback();
+			}
+			async.parallel([
+				async.apply(db.incrObjectFieldBy, 'category:' + topicData[0].cid, 'post_count', -1),
+				async.apply(db.incrObjectFieldBy, 'category:' + topicData[1].cid, 'post_count', 1)
+			], callback);
+		});
+	}
+
 	function updateRecentTopic(tid, callback) {
 		async.waterfall([
 			function(next) {