Composed_of, aggregate object isn't saved

I am relatively new to rails and I cannot figure out what is going on
here. I am using the composed_of method in an ActiveRecord class to
create two aggregate properties: shipping_address and billing_address.
The object properties are getting populated from the form and validation
is working - no problem. When I call order.save, though, everything is
being saved except the address fields. I am not getting any errors - it
is just that none of the address info is saved to the database. I even
ran script/console and manually created and saved an order there - same
result.

Anyone have any ideas? Below is the Order class. Thanks.

class Order < ActiveRecord::Base
belongs_to :payment_type
has_many :line_items, :dependent => :delete_all

composed_of :shipping_address,
:class_name => ‘Address’,
:mapping =>
[
%w(street, street),
%w(street2, street2),
%w(city, city),
%w(state, state),
%w(zip, zip)
] do |p|
Address.new p[:street], p[:street2], p[:city], p[:state], p[:zip]
end

composed_of :billing_address,
:class_name => ‘Address’,
:mapping =>
[
%w(billing_street, street),
%w(billing_street2, street2),
%w(billing_city, city),
%w(billing_state, state),
%w(billing_zip, zip)
] do |p|
Address.new p[:street], p[:street2], p[:city], p[:state], p[:zip]
end

end

Oh, forgot: I’m running rails 2.2.2, mysql 5.0.45, OSX

and here is the address class

class Address
attr_reader :street, :street2, :city, :state, :zip

def initialize(street, street2, city, state, zip)
@street = street
@street2 = street2
@city = city
@state = state
@zip = zip
end

end