example.rb

require 'rubygems'
require 'data_mapper'

::DataMapper.setup(:default,'mysql://root@127.0.0.1/test')

class CartItem
  include DataMapper::Resource
  belongs_to :product
  property :id, Serial
end

class Product
  include DataMapper::Resource
  has n, :cart_items
  property :id, Serial
  property :deleted, ParanoidBoolean, :default => false, :lazy => false
end

DataMapper.finalize

# This will output nil if :lazy => true for the ParanoidBoolean
puts CartItem.get(3).product.inspect