Rails - Mar 2008 - Requiring User to Select Categories -- (on Post Creation)

Hello,

I''m having trouble with validation. I want to require the user to
select
a category before a post is successfully created.

 I''m using has_many :through for posts and categories as follows:

 class Post < ActiveRecord::Base
  has_many :categorizations
  has_many :categories, :through => :categorizations
 end

 class Categorization < ActiveRecord::Base
  belongs_to :category
  belongs_to :post
 end

 class Category < ActiveRecord::Base
   has_many :categorizations
   has_many :posts, :through => :categorizations
 end

I''ve tried validates_presence_of :categorizations in the Post model,
but
the application simply saves it without verifying that the user selected
a checkbox.

Any ideas what I can do?
-- 
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