From d60ed3d401b7b45c2debef561c2a7740eee1a511 Mon Sep 17 00:00:00 2001
From: "Matthew M. Boedicker" <matthewm@boedicker.org>
Date: Fri, 4 Jan 2013 22:20:36 -0800
Subject: Add join table migration generator to usage help.

---
 railties/lib/rails/generators/rails/migration/USAGE | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'railties/lib/rails')

diff --git a/railties/lib/rails/generators/rails/migration/USAGE b/railties/lib/rails/generators/rails/migration/USAGE
index f340ed97f2..baf3d9894f 100644
--- a/railties/lib/rails/generators/rails/migration/USAGE
+++ b/railties/lib/rails/generators/rails/migration/USAGE
@@ -20,3 +20,16 @@ Example:
       add_column :posts, :title, :string
       add_column :posts, :body, :text
       add_column :posts, :published, :boolean
+
+Migration names containing JoinTable will generate join tables for use with
+has_and_belongs_to_many associations.
+
+Example:
+    `rails g migration CreateMediaJoinTable artists musics:uniq`
+
+    will create the migration
+
+    create_join_table :artists, :musics do |t|
+      # t.index [:artist_id, :music_id]
+      t.index [:music_id, :artist_id], unique: true
+    end
-- 
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