From ca0af8221a3b704fa289afe7030a96dc8cec8a95 Mon Sep 17 00:00:00 2001
From: Joshua Wood <josh@hintmedia.com>
Date: Fri, 2 Mar 2012 17:59:23 -0800
Subject: Automatically create indexes for references/belongs_to statements in
 migrations.

---
 guides/source/migrations.textile | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'guides/source/migrations.textile')

diff --git a/guides/source/migrations.textile b/guides/source/migrations.textile
index f663496854..aa75e9ab4a 100644
--- a/guides/source/migrations.textile
+++ b/guides/source/migrations.textile
@@ -475,7 +475,16 @@ end
 </ruby>
 
 will add an +attachment_id+ column and a string +attachment_type+ column with
-a default value of 'Photo'.
+a default value of 'Photo'. +references+ also allows you to define an
+index directly, instead of using +add_index+ after the +create_table+ call:
+
+<ruby>
+create_table :products do |t|
+  t.references :category, :index => true
+end
+</ruby>
+
+will create an index identical to calling `add_index :products, :category_id`.
 
 NOTE: The +references+ helper does not actually create foreign key constraints
 for you. You will need to use +execute+ or a plugin that adds "foreign key
-- 
cgit v1.2.3

