Rails - Jul 2006 - has_many relation handling

Hello,

please have a look at this:

My tables:

    create_table :languages do |t|
      t.column :name, :string, :limit => 3
      t.column :title, :string, :limit => 30
    end

    create_table :categories do |t|
      t.column :category_id, :integer (3.)
      t.column :created_at, :timestamp
      t.column :updated_at, :timestamp
    end

    create_table :categorytranslations, :id => false do |t|
      t.column :category_id, :integer
      t.column :language_id, :integer
      t.column :name, :string, :limit => 60
      t.column :description, :string, :limit => 120
    end


My models:

class Category < ActiveRecord::Base
  has_one :category (3.)
  has_many :categorytranslations, :dependent => true (1.)
  has_many :languages, :through => :categorytranslations (2.)
end

class Categorytranslation < ActiveRecord::Base
  belongs_to :category (1.)
  belongs_to :language (1.)

  validates_length_of :name, :within => 2..60
  validates_length_of :description, :maximum => 120
  validates_uniqueness_of :language_id, :scope => :category_id
end



Do the relations what I think they should do?...

1. A category should have many categorytranslations and each translation
has a corresponding language.
2. A category "knows" all languages used in its translations.
3. A category has one related category (parent category in tree).

If it is ok...
How do I add a new Categorytranslation to Category? So how do I access
it from Category?

At the moment I''ve only found this manual stuff:

c = Category.new :category_id => 0
c.save
t = c.categorytranslations.new :category_id => c.id, :language_id => 0,
    name => ''Cars'', :description => ''Cars,
trucks''
t.save

Can this for example category_id => c.id be handled by Rails?


Thanks
Markus