Rails - Dec 2008 - Shopping cart (Newbie)

I have a shopping cart project that I am putting together. I am able
to combine items and get the correct price, however the quantity does
not show up as to how many of the same item is being bought. Here is
my code. Any suggestions wold help out this newbie... not sure what I
am doing wrong...Thanks!

class Basket

	attr_reader :purchases
	attr_reader :total



	def initialize
	@purchases = []
	@total = 0.0
	end


   def add_purchase(cart)
    @purchases << Purchase.buy_one(cart)
	@total += cart.price
	end

   def add_purchase(cart)
   	appendFlag = true
   	for purchase in @purchases
   	  if (cart.id == purchase.cart.id)
   	   appendFlag = false
   	    purchase.quantity += 1
   	   end
   	end
   if(appendFlag)
	 @purchases << Purchase.buy_one(cart)
	 end

	@total += cart.price
	end

	 def clear
        @purchases = []
        @total = 0.0
        end

end
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