Creating new HaBtM?

Ok, I must be lame. Can't figure out how to create a new entry in my HABTM models. I just want to add a new book with two authors.. How do I do it?

class Author < ActiveRecord::Base   has_and_belongs_to_many :books end

class Books < ActiveRecord::Base   has_and_belongs_to_many :authors end

Your Books model should be called Book. Once that's ok it's as easy as book.authors = [author_1, author_2]

Fred