From a8ee0ecc6992f9bd8a1d4ecd35f7dd9a2f124e4b Mon Sep 17 00:00:00 2001
From: Tim Abbott <tabbott@humbughq.com>
Date: Fri, 19 Oct 2012 17:55:49 -0400
Subject: [PATCH] Fix bug allowing subscribing to a stream twice.

(imported from commit c49b7c8ec49fd71bb1e1f1226d9e126d4d0987df)
---
 zephyr/views.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/zephyr/views.py b/zephyr/views.py
index 5f66d2b55d..1ad9cc4b6e 100644
--- a/zephyr/views.py
+++ b/zephyr/views.py
@@ -584,7 +584,7 @@ def json_add_subscription(request):
 def add_subscriptions_backend(request, user_profile, streams):
     subscribed = []
     already_subscribed = []
-    for stream_name in streams:
+    for stream_name in list(set(streams)):
         stream = create_stream_if_needed(user_profile.realm, stream_name)
         recipient = Recipient.objects.get(type_id=stream.id,
                                           type=Recipient.STREAM)