From 1393eac44c49299e733a5181f387ba140aaa3e44 Mon Sep 17 00:00:00 2001
From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Mon, 19 Feb 2018 16:59:42 -0500
Subject: Implement remove() for _empty_collection

Fixed regression caused in 1.2.3 due to fix from :ticket:`4181` where
the changes to the event system involving :class:`.Engine` and
:class:`.OptionEngine` did not accommodate for event removals, which
would raise an ``AttributeError`` when invoked at the class
level.

Change-Id: I1c9083829d74dd710716d28b0eaca4fa15e86313
Fixes: #4190
---
 lib/sqlalchemy/event/attr.py | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lib/sqlalchemy')

diff --git a/lib/sqlalchemy/event/attr.py b/lib/sqlalchemy/event/attr.py
index efa8fab42..c33ec82ff 100644
--- a/lib/sqlalchemy/event/attr.py
+++ b/lib/sqlalchemy/event/attr.py
@@ -54,6 +54,9 @@ class _empty_collection(object):
     def extend(self, other):
         pass
 
+    def remove(self, element):
+        pass
+
     def __iter__(self):
         return iter([])
 
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