Rails - Jun 2006 - options_from_collection_for_select question

I am doing the recipe/category example, but with a 
has_many_and_belongs_to relationship.  To select categories for a 
recipe, I have a select control.  When editing, I want the proper 
categories selected.  In order to get it to work, I put this in my 
_form.rhtml:

<select id="recipe_categories"
name="recipe[category_ids][]" size="4"
multiple>
   <%= options_from_collection_for_select( @categories,
''id'', ''name'',
@recipe.categories.map{|t| t.id}) %>
</select>

Is this the best way to do this?

~S