FEATURE: Add a location field to a user's profile

db/migrate/20140527163207_create_user_profiles.rb

@@ -0,0 +1,14 @@
+class CreateUserProfiles < ActiveRecord::Migration
+  def up
+    create_table :user_profiles, id: false do |t|
+      t.references :user
+      t.string :location
+    end
+    execute "ALTER TABLE user_profiles ADD PRIMARY KEY (user_id)"
+    execute "INSERT INTO user_profiles (user_id) SELECT id FROM users"
+  end
+
+  def down
+    drop_table :user_profiles
+  end
+end