From dc171a930561e77d56a386b702193678369f882d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tomasz=20Czeka=C5=84ski?= <t.czekanski@gmail.com>
Date: Wed, 10 Jan 2018 20:29:28 +0100
Subject: [PATCH] Fix legacy support (missing of_type variable) for
 _UnboundLoad.__setstate__ method

While retrieving SqlAlchemy objects with dogpile cache stored by previous release (1.1.3) of SqlAlchemy exception UnboundLocalError was raised:

```UnboundLocalError: local variable 'of_type' referenced before assignment```
---
 lib/sqlalchemy/orm/strategy_options.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/sqlalchemy/orm/strategy_options.py b/lib/sqlalchemy/orm/strategy_options.py
index 13c5100475..1963e5843d 100644
--- a/lib/sqlalchemy/orm/strategy_options.py
+++ b/lib/sqlalchemy/orm/strategy_options.py
@@ -449,6 +449,7 @@ def __setstate__(self, state):
                 if len(key) == 2:
                     # support legacy
                     cls, propkey = key
+                    of_type = None
                 else:
                     cls, propkey, of_type = key
                 prop = getattr(cls, propkey)