From d4cbc71b0a1c578340d826a7bfcbf07ec0d763bf Mon Sep 17 00:00:00 2001
From: Joseph Lawson <joe@joekiller.com>
Date: Tue, 21 Oct 2014 16:37:54 -0400
Subject: [PATCH] fix eip physical_resource_id not returning an public_ip if it
 is in EC2 classic.

---
 moto/ec2/models.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/moto/ec2/models.py b/moto/ec2/models.py
index 6038db09..b7ab1266 100644
--- a/moto/ec2/models.py
+++ b/moto/ec2/models.py
@@ -1964,7 +1964,7 @@ class ElasticAddress(object):
 
     @property
     def physical_resource_id(self):
-        return self.allocation_id
+        return self.allocation_id if self.allocation_id else self.public_ip
 
     def get_cfn_attribute(self, attribute_name):
         from moto.cloudformation.exceptions import UnformattedGetAttTemplateException