Rails: Overriding ActiveRecord association method

Question

Is there a way to override one of the methods provided by an ActiveRecord association?

Say for example I have the following typical polymorphic has_many :through ass

Answer 1

If you want to access the model itself in Rails 3.2 you should use proxy_association.owner

Example:

class Author < ActiveRecord::Base
  has_many :books do
    def << (book)
      proxy_association.owner.add_book(book)
    end
  end

  def add_book (book)
    # do your thing here.
  end
end

See documentation