From 92e67511d57bd67e3d2f6788eed20b03f9e2ed68 Mon Sep 17 00:00:00 2001
From: Brian Gough <bjg@network-theory.co.uk>
Date: Mon, 16 Feb 2015 16:44:06 +0000
Subject: [PATCH] sort by doc_id to ensure consistent order for all changes
 with the same timestamp

---
 services/track-changes/app/coffee/MongoPackManager.coffee | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/services/track-changes/app/coffee/MongoPackManager.coffee b/services/track-changes/app/coffee/MongoPackManager.coffee
index ed5bad6249..18e596fcf0 100644
--- a/services/track-changes/app/coffee/MongoPackManager.coffee
+++ b/services/track-changes/app/coffee/MongoPackManager.coffee
@@ -158,7 +158,12 @@ module.exports = MongoPackManager =
 				return true
 
 			timeOrder = (a, b) ->
-				b.meta.end_ts - a.meta.end_ts
+				(b.meta.end_ts - a.meta.end_ts) || documentOrder(a, b)
+
+			documentOrder = (a, b) ->
+				x = a.doc_id.valueOf()
+				y = b.doc_id.valueOf()
+				if x > y then 1 else if x < y then -1 else 0
 
 			updates = MongoPackManager._filterAndLimit(updates, unpackedSet, filterFn, limit)
 			#console.log 'initial updates are', updates