From b8a0cfd6f75c266cf5844635007af9f77b469f51 Mon Sep 17 00:00:00 2001 From: John Kerkstra Date: Wed, 18 Oct 2017 16:23:14 -0500 Subject: [PATCH] filter out already related elbs to prevent duplicates (#1270) --- moto/autoscaling/models.py | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/moto/autoscaling/models.py b/moto/autoscaling/models.py index a921c74ab..fd8efd54f 100644 --- a/moto/autoscaling/models.py +++ b/moto/autoscaling/models.py @@ -545,7 +545,8 @@ class AutoScalingBackend(BaseBackend): def attach_load_balancers(self, group_name, load_balancer_names): group = self.autoscaling_groups[group_name] - group.load_balancers.extend(load_balancer_names) + group.load_balancers.extend( + [x for x in load_balancer_names if x not in group.load_balancers]) self.update_attached_elbs(group_name) def describe_load_balancers(self, group_name):