state miaso

gistfile1.rb

class A

  state_machine do
    state :active
    state :removed

    event :remove do
      transition :active => :removed
    end

    after_transition :active => :removed, :do => :fire_callbacks

  end

  def nested_records
    B.all
  end

  def fire_callbacks
    send_to_external_server
    nested_record.skip_callback_after_remove = true
    nested_record.remove
  end

end

class B

  attr_accessor :skip_callback_after_remove

  state_machine do
    state :active
    state :removed

    event :remove
      transition :active => :removed
    end

    # если у b есть a и a -> removed -> то только тогда вызываем коллбек
    after_transition :active => :removed, :do => :fire_callbacks
  end

  def fire_callbacks
    unless skip_callbacks_after_remove
      send_to_external_server
    end
  end

end