Rails - Jan 2014 - has_and_belongs_to_many question

Hello,

I'm new to Ruby/Rails and going through 'Beginning Rails 4'.  In
chapter 6
it has me create a join table for an articles and categories table 
(articles_categories).  In the migrate file I've entered this code from the 
book:

class CreateArticlesCategories < ActiveRecord::Migration
  def change
    create_table :articles_categories, :id=> false do |t|
      t.references :article
      t.references :category
    end
  end
  def self.down
    drop_table :articles_categories
  end
end


My issue is that after I migrate this file, when I try to make an 
association between the article and category object (article.categories <<
category) it spits an error that article_id does not exist in 
articles_categories table.  It makes sense to me since the references above 
do no have _id appended in the class.  If I change the class to the 
following, creating the relationship between article and category works 
fine:

class CreateArticlesCategories < ActiveRecord::Migration
  def change
    create_table :articles_categories, :id=> false do |t|
      t.integer :article_id
      t.integer :category_id
    end
  end
  def self.down
    drop_table :articles_categories
  end
end


My question is, how can I get the 't.references' format to work so that
AR
looks for an 'articles' and 'categories' column, instead of the
same with
_id appended?

Thanks

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