Question:
I need send an email alert when the price of a product changes. Is it possible do this with ActiveRecord::Observer or do I need use programming logic in the edit form?
Solution:1
You can use Dirty Objects in order to achieve that, in this specific case, you'll have something like this in your observer.
FooMailer.deliver_alert(foo) if foo.price_changed? According to: "Once you save a dirty object it clears out its changed state tracking and is once again considered unchanged" You should ask for the prince_changed? before the save operation is done.
Hope It helps you.
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