From 4ff600ff45a4fa85c9edc9629d4da667439e5795 Mon Sep 17 00:00:00 2001
From: Thomas Hille <thomahi@gmx.de>
Date: Thu, 23 Mar 2017 14:10:09 +0100
Subject: [PATCH] added index to submissions for better performance in
 recommending exercises

---
 db/migrate/20170323130756_add_index_to_submissions.rb | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 db/migrate/20170323130756_add_index_to_submissions.rb

diff --git a/db/migrate/20170323130756_add_index_to_submissions.rb b/db/migrate/20170323130756_add_index_to_submissions.rb
new file mode 100644
index 00000000..185500d3
--- /dev/null
+++ b/db/migrate/20170323130756_add_index_to_submissions.rb
@@ -0,0 +1,6 @@
+class AddIndexToSubmissions < ActiveRecord::Migration
+  def change
+    add_index :submissions, :exercise_id
+    add_index :submissions, :user_id
+  end
+end