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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