Subclass does not call super in constructor

I am working with the book agile Web Development second edition, and in page 110 there is an example i how to create the model CartItem.

I am using rails 2.0 and after adding the class CartItem I get an error at the constructor Initialize

class CartItem < ActiveRecord::Base attr_reader :product, :quantity

def initialize(product) @product = product @quantity = 1 end

it underlines the word "initialize" and says "Subclass does not call super in constructor"

I am working with the book agile Web Development second edition, and in page 110 there is an example i how to create the model CartItem.

I am using rails 2.0 and after adding the class CartItem I get an error at the constructor Initialize

class CartItem < ActiveRecord::Base

Check the example again - CartItem doesn't inherit from ActiveRecord.

Barry