Created
January 30, 2009 14:23
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Calculate sum of a Hashed cart
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| # make sure cart is composed of integers first. | |
| # Without AR finding : | |
| items = {1=>2, 3=>4} | |
| price = 1.0 | |
| items.to_a.inject(0) {|sum,cart_item| sum + price * cart_item[1]} | |
| # => 6.0 | |
| items.to_a.inject(0) {|sum,cart_item| sum + Product.find(@items[cart_item[0]],:select => :price).price * cart_item[1]} | |
| # => 6.0 | |
| # if prices are all eq to 1.0 |
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