From 237968b1b7239f9be2fc0c2d2fea6eb572c302f6 Mon Sep 17 00:00:00 2001
From: Sam <sam.saffron@gmail.com>
Date: Thu, 24 Aug 2017 13:33:25 -0400
Subject: [PATCH] PERF: add an index on slug to make sure that slug lookups are
 quick

---
 db/migrate/20170824172615_add_slug_index_on_topic.rb | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 db/migrate/20170824172615_add_slug_index_on_topic.rb

diff --git a/db/migrate/20170824172615_add_slug_index_on_topic.rb b/db/migrate/20170824172615_add_slug_index_on_topic.rb
new file mode 100644
index 00000000000..eceb567fc96
--- /dev/null
+++ b/db/migrate/20170824172615_add_slug_index_on_topic.rb
@@ -0,0 +1,9 @@
+class AddSlugIndexOnTopic < ActiveRecord::Migration
+  def up
+    execute 'CREATE INDEX idxTopicSlug ON topics(slug) WHERE deleted_at IS NULL AND slug IS NOT NULL'
+  end
+
+  def down
+    execute 'DROP INDEX idxTopicSlug'
+  end
+end