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A comment on Race conditions on Facebook, DigitalOcean and others (fixed). Parent comment

Re:Race conditions on Facebook, DigitalOcean and others (fixed) by some1else on Monday April 27, 2015 @02:58PM (#9448422)
Therefore the only thing left to do is run the following migration:

  add_index :discounts, [:promo_code_id, :customer_id, :order_id], :unique => true
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