From bc3ea63752a7f7d94efd35c0265f34a9a646639b Mon Sep 17 00:00:00 2001
From: Emily Stark <emily@meteor.com>
Date: Fri, 27 Sep 2013 15:10:18 -0700
Subject: [PATCH] Make sure our mutated options object makes into the actual
 collection method

---
 packages/mongo-livedata/collection.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/mongo-livedata/collection.js b/packages/mongo-livedata/collection.js
index 75ade797d8..dd73418b35 100644
--- a/packages/mongo-livedata/collection.js
+++ b/packages/mongo-livedata/collection.js
@@ -375,7 +375,8 @@ _.each(["insert", "update", "remove", "upsert"], function (name) {
       args[0] = Meteor.Collection._rewriteSelector(args[0]);
 
       if (name === "update") {
-        var options = _.clone(args[2]) || {};
+        // Mutate args but copy the original options object.
+        var options = args[2] = _.clone(args[2]) || {};
         if (isUpsert)
           options.upsert = true;
         if (options && options.upsert) {