使用AASM调用状态更改方法

Question

如何在AASM中调用状态更改方法？

当状态转换为以下模型中的付费时，我想调用update_foo：

class Foo < ActiveRecord::Base
  include AASM

  # State Machine
  aasm_initial_state :incomplete
  aasm_state :incomplete
  aasm_state :paid

  aasm_event :pay do
    transitions :from => :incomplete, :to => :paid
  end

  def update_foo
  ...
  end
end

Answer 1

没关系 - 想通了：

aasm_state :paid, :enter => :update_foo