How does an around_action callback work? An explanation is needed

Question

I am terribly confused about an around_action. How do they work? Can someone please provide me with an example/explanation of how they work?

This is a quote from my Agil

Answer 1

My understanding is as below:

begin
    # Do before action...
    logger.info 'I am the before action'

    # Do the action, which is passed as a block to your "around filter"
    # Note that if you were to delete this line, the action will never be called!
    yield

    # Do after action...
    logger.info 'I am the after action'
ensure
    raise ActiveRecord::Rollback
end