rails with_lock

note_for_locking

see http://guides.rubyonrails.org/3_2_release_notes.html

This makes it possible to write the following:


class Order < ActiveRecord::Base
  def cancel!
    transaction do
      lock!
      # ... cancelling logic
    end
  end
end


as:

class Order < ActiveRecord::Base
  def cancel!
    with_lock do
      # ... cancelling logic
    end
  end
end