Forum: Ruby on Rails Keeping a Running Total

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Eric M. (Guest)
on 2008-10-11 00:42
(Received via mailing list)

I'm working on a site where I need to keep a running tab of inventory
sold. Each of my Item classes has a sku and a quantity. As items get
created, destroyed, and have their quantity changed, I want to alter
the value of a field called "allocated" in my sku class. Ideally, I
want to make this transactional, so the value of "allocated" doesn't
fall out of sync. What is the best way to approach this?

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