Pre-checking collection of model objects used as check boxes with Formtastic

So I've got some objects that I'm passing as a collection:

@things = Thing.all

And in my view:

<%= f.input :things, :collection => @things, :as => :check_boxes %>
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Is there any way to specify which of the objects should already be checked when the view is loaded?

Thanks!

---

In your controller's "new" action, you want to initialise the form object with the values you want by default:

def new
  @post = Post.new
  @post.things = [@one_thing, @another_thing]
end

This can also be done as an after_initialize hook in the model itself.