Fetch updates in reverse chronological order by default.

app/models/update.rb

@@ -1,4 +1,5 @@
 class Update < ActiveRecord::Base
   attr_accessible :body, :subject, :user_id
   belongs_to :user
+  default_scope order("created_at desc")
 end

spec/models/update_spec.rb

@@ -1,5 +1,9 @@
 require 'spec_helper'
 
 describe Update do
-  pending "add some examples to (or delete) #{__FILE__}"
+  it "should be sorted in reverse order" do
+    Update.create! :subject => "first entry", :body => "blah", :user_id => 1
+    Update.create! :subject => "second entry", :body => "blah", :user_id => 1
+    Update.first.subject.should == "second entry"
+  end
 end