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.