actually, if it is the same database, then there is no way to happen at
the same time, right?
I don't know, maybe something like this:
class Tablet < ActiveRecord::Base
validate :must_have_in_stock
def must_have_in_stock
qnt = Tablet.find(product_id).quantity
erros.add(:quantity, 'There is only ' + qnt + ' in stock.')
if quantity > qnt
end
end
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