[Rails] accepts_nested_attributes_for issue

Hello,

I am using accepts_nested_attributes_for for saving the records.

let say I have a model

class User < AR::Base

 has_many :books
 accepts_nested_attributes_for :books

end

class Book < AR::Base
  belongs_to :user
end

Now the params value I am getting is

user={:id => 123, books_attributes={:name => "test"}}

and in my books controller

def create
user = @user.update_attributes(params[:user])
@book = ????
end

Every thing is working as expected but my requirement is that the book which is saved I need to know the ID.

How do I find the books ID.

Thanks
Abhis

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