topics.getPids will return mainPid as well

src/categories/recentreplies.js

@@ -36,24 +36,15 @@ module.exports = function(Categories) {
 		}
 
 		updatePostCount(tid, oldCid, cid);
-		async.parallel({
-			mainPid: function(next) {
-				topics.getTopicField(tid, 'mainPid', next);
-			},
-			pids: function(next) {
-				topics.getPids(tid, next);
-			}
-		}, function(err, results) {
+		topics.getPids(tid, function(err, pids) {
 			if (err) {
 				return winston.error(err.message);
 			}
 
-			if (!results.mainPid && results.pids && !results.pids.length) {
+			if (pids && !pids.length) {
 				return;
 			}
 
-			var pids = [results.mainPid].concat(results.pids);
-
 			var keys = pids.map(function(pid) {
 				return 'post:' + pid;
 			});

src/threadTools.js

@@ -73,7 +73,7 @@ var winston = require('winston'),
 	ThreadTools.purge = function(tid, uid, callback) {
 		async.parallel({
 			topic: function(next) {
-				topics.getTopicFields(tid, ['cid', 'mainPid'], next);
+				topics.getTopicFields(tid, ['cid'], next);
 			},
 			pids: function(next) {
 				topics.getPids(tid, next);
@@ -83,16 +83,9 @@ var winston = require('winston'),
 				return callback(err);
 			}
 
-			var pids = [];
-			if (results.topic.mainPid) {
-				pids = [results.topic.mainPid].concat(results.pids);
-			} else {
-				pids = results.pids;
-			}
-
 			async.parallel([
 				function(next) {
-					async.eachLimit(pids, 10, posts.purge, next);
+					async.eachLimit(results.pids, 10, posts.purge, next);
 				},
 				function(next) {
 					topics.purge(tid, next);

src/topics/posts.js

@@ -182,7 +182,22 @@ module.exports = function(Topics) {
 	};
 
 	Topics.getPids = function(tid, callback) {
-		db.getSortedSetRange('tid:' + tid + ':posts', 0, -1, callback);
+		async.parallel({
+			mainPid: function(next) {
+				Topics.getTopicField(tid, 'mainPid', next);
+			},
+			pids: function(next) {
+				db.getSortedSetRange('tid:' + tid + ':posts', 0, -1, next);
+			}
+		}, function(err, results) {
+			if (err) {
+				return callback(err);
+			}
+			if (results.mainPid) {
+				results.pids = [results.mainPid].concat(results.pids);
+			}
+			callback(null, results.pids);
+		});
 	};
 
 	Topics.increasePostCount = function(tid, callback) {