Rails 3: How to identify after_commit action in observers? (create/update/destroy)

Question

I have an observer and I register an after_commit callback. How can I tell whether it was fired after create or update? I can tell an item was destroyed by asking

Answer 1

I've learned today that you can do something like this:

after_commit :do_something, :on => :create

after_commit :do_something, :on => :update

Where do_something is the callback method you want to call on certain actions.

If you want to call the same callback for update and create, but not destroy, you can also use: after_commit :do_something, :if => :persisted?

It's really not documented well and I had a hard time Googling it. Luckily, I know a few brilliant people. Hope it helps!