From 9d61573e52a9ae29fd03bd723f8dbdfcff146369 Mon Sep 17 00:00:00 2001
From: Richard Frank <rich@quantopian.com>
Date: Wed, 30 Sep 2015 19:32:03 -0400
Subject: [PATCH] MAINT: Instance attribute isn't used

---
 zipline/assets/asset_writer.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/zipline/assets/asset_writer.py b/zipline/assets/asset_writer.py
index 870e9ca7..639da243 100644
--- a/zipline/assets/asset_writer.py
+++ b/zipline/assets/asset_writer.py
@@ -310,7 +310,8 @@ class AssetDBWriter(with_metaclass(ABCMeta)):
         constraints : bool, optional
             If True, create SQL ForeignKey and PrimaryKey constraints.
         """
-        self.sql_metadata = metadata = sa.MetaData(bind=engine)
+        metadata = sa.MetaData(bind=engine)
+
         self.equities = sa.Table(
             'equities',
             metadata,