Rails - Apr 2006 - Has Many :through associations

Greetings again:

I''m simplifying the case I presented earlier regarding the use of 
has_many :through.  I''m using DHH''s example from
"Persuing Beauty with
Ruby On Rails".

Here are his models:

class Author < ActiveRecord::Base
  has_many :authorships
  has_many :books, :through => :authorships
end

class Book < ActiveRecord::Base
  has_many :authorships
  has_many :authors, :through => :authorships
end

class Authorship < ActiveRecord::Base
  belongs_to :author
  belongs_to :book
end

Here''s the code sample he provides to exercise the new functionality:

david, awrd = Author.find(1), Book.find(1)
david.authorships.create( :book => awrd,
  :contribution => "partial",
  :written_in => "Denmark"
)

david.authorships.first.written_in # => "Denmark"
david.books.first # => awrd

Ok, fine and good.  So how do I remove the created authorship?  The only 
way I have found is this:

Authorship.find(:first,
  :conditions => ["author_id = ? and book_id = ?",
    david.id, awrd.id]).destroy

That doesn''t seem like the "Rails" way of doing things.  I
hoping that I
am  missing something.  Can anyone help me?

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