[Gem] AASM 狀態機

@(Ruby on Rails)[rails, gem]

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# AASM is a continuation of the acts-as-state-machine rails plugin, built for plain Ruby objects. gem 'aasm', '~> 4.12', '>= 4.12.0'

instance method

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## # check status ##   job.running? # => true job.may_run? # => false   job.aasm.current_state # stage3 job.aasm_state # => 'sleeping' job.aasm.human_state # => 'sleeping' job.aasm.states(:permitted => true).map(&:name) # show all permitted states (from initial state) job.aasm.states(:permitted => false).map(&:name) # show all non permitted states job.aasm.events.map(&:name) # show all possible (triggerable) events from the current state   ## # change status 的方法要根據在 AASM 中 event 所定義的名稱 ## job.sleep # => triggered :sleep job.sleep! # => triggered :sleep!

class method

1	Job.aasm.states_for_select # 產生可以直接套用到 select 的 options

erb 中帶入 select options

1	<%= select_tag :transaction_state, options_for_select(Transaction.aasm.states_for_select), class: '-control' %>

目錄

[TOC]

Automatic Scope

在 AASM 中內建了 Model Scope 讓我們使用：

1 2	# 假設 Order 有 paid 的狀態，那麼可以直接使用 Order.paid

i18n

AASM 支援在 i18n 定義：

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zh-TW: activerecord: attributes: order: status/waiting_for_payment: 等待付款 status/paid: 已付款 status/failed: 已出貨 status/canceled: 已逾期 status/expired: 已退款 status/refunded: 已退款

使用範例

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# ./OnePageShop/app/models/order.rb class Order < ApplicationRecord # Concerns macros include AASM   # Attributes related macros aasm column: 'status', no_direct_assignment: true, requires_lock: true do # 等待付款 state :waiting_for_payment, initial: true # 已付款 state :paid # 已出貨 state :shipped # 訂單逾期 state :expired # 已退款 state :refunded   after_all_transitions :generate_status_transition_log!   event :mark_as_paid do transitions from: %i(placed waiting_for_payment), to: :paid end   event :mark_as_shipped do transitions from: :paid, to: :shipped end   event :mark_as_expired do transitions from: :waiting_for_payment, to: :expired end   event :mark_as_refunded do transitions from: :paid, to: :refunded 大专栏  [Gem] AASM 狀態機n class="keyword">end end   # ...   private # callback methods def can_not_be_destroyed throw :abort end   def generate_status_transition_log! status_logs.create!(status: aasm.to_state) end end

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# ./OnePageShop/app/models/transaction.rb class Transaction < ApplicationRecord # Concerns macros include AASM   # Attributes related macros aasm column: 'status', no_direct_assignment: true, requires_lock: true do # 等待繳款 state :waiting_for_payment, initial: true # 已付款 state :paid # 交易失敗 state :failed # 取消 state :canceled # 逾期 state :expired # 已退款 state :refunded   after_all_transitions :generate_status_transition_log!   event :mark_as_paid do transitions from: :waiting_for_payment, to: :paid end   event :mark_as_paid do transitions from: :waiting_for_payment, to: :failed end   event :mark_as_canceled do transitions from: :waiting_for_payment, to: :canceled end   event :mark_as_expired do transitions from: :waiting_for_payment, to: :expired end   event :mark_as_refunded, after: :check_all_transactions_refunded! do transitions from: :paid, to: :refunded end end   # callbacks after_initialize :generate_trade_number after_create :generate_status_change_log! after_update :update_order_status!   private # callback methods def generate_status_change_log! status_logs.create!(status: aasm.current_state) end   def generate_status_transition_log! status_logs.create!(status: aasm.to_state) end   def update_order_status! return if payment_info.nil?   if self.paid? # set all waiting for payment transaction as canceled self.order.transactions.waiting_for_payment.each do |transaction| transaction.mark_as_canceled! if transaction.may_mark_as_canceled? end   self.order.mark_as_paid! if self.order.may_mark_as_paid? end end   def check_all_transactions_refunded! # 若沒有其餘等待付款或已付款的交易，則將訂單狀態改為已退款 if !Transaction.where(order_id: self.order_id, status: %i(waiting_for_payment paid)).exists? self.order.mark_as_refunded! end end end

參考

• AASM @ github