default_scope in rails 3

I k开发者_如何学编程now named_scope has been changed to scope in rails 3.

How do I perform default_scope in rails 3, I've had a good google but found nothing for defaults scopes.

---

default_scope is available in Rails 3.0, see the following

• Lighthouse Ticket referencing default_scope in Rails 3.0
• Github Rails 3.0 scope code
• Railscast about scope in Rails 3.0

---

Here's another pointer: the api doc for AR::Base.default_scope

---

default_scope where(:abc => val)