Rails - Feb 2008 - association can't be changed

Hi, all!
May you ever feel happy!

I''m getting some very strange behaviour and I''m not sure where
my
mistake lies.

I have a Divination model that belongs_to :book.

I get the following in script/console:
>> d = Divination.find(7) # => #<Divination id: 7, user_id: 1,
book_id: 4...
>> d.book # => #<Book id: 4...
Now if I change the book:
>> d.book = Book.find(5) # => #<Book id: 5...
>> d.book # => #<Book id: 4
# It''s still the same!
Now I try to change the book_id:
>> d.book_id = 6 # => 6
>> d.book_id # => 6
Wow! It changed!
>> d.book # => #<Book id: 4
But alas! The book is the same!

It certainly shouldn''t be this way, should it? Or am I missing
something
very important?

Yours,
Damian

P.S. It is Rails 2.0.2 on Mac OS X 10.5 Leopard
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> Now if I change the book:
>>> d.book = Book.find(5) # => #<Book id: 5...
>>> d.book # => #<Book id: 4
should be:
d.book << Book.find(5)
> Now I try to change the book_id:
>>> d.book_id = 6 # => 6
>>> d.book_id # => 6
> Wow! It changed!
>>> d.book # => #<Book id: 4
not sure, but maybe you would have to save the thing, before the id 
change changes the book?
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