Bang methods don't transition new_records when skip_validation_on_save is true

It will set the value back to old_value as the update_all won't match any records where(self.class.primary_key => self.id) as self.id doesn't exist

See https://github.com/aasm/aasm/blob/master/lib/aasm/persistence/active_record_persistence.rb#L87-L89

Makes some transitions harder from other state machine gems

Example:

class Order < ActiveRecord::Base
  aasm(skip_validation_on_save: true) do
    state :new, initial: true
    state :shipped

    event :process do
      transitions(from: :new, to: :shipped)
    end
  end
end

spec

let(:order) { Order.new }

it "should change the status when a bang method is called" do
  expect { order.process! }.to change(order, :status).from('new').to('shipped')
end