在我們rails 3.2應用程式寶石workflow，所述workflow被定義爲這樣的： workflow do
state :new do
event :submit, :transitions_to => :being_reviewed
end
state :being_reviewed do
event :approve,
在我們的rails應用程序中，某些model可能需要approval process。例如，對於purchasing order (PO)，通常從提交PO開始，然後經理批准並且首席執行官批准PO可以發送給供應商。審批程序可能是預定義的。隨着approval process，我們也想爲每一個過渡記錄數據： 1. who did it (use id),
2. when she/he did
Worflow是一款狀態機紅寶石寶石。以下是其在github上的文檔的代碼示例： class Article
include Workflow
workflow do
state :new do
event :submit, :transitions_to => :awaiting_review
end
state :awaiting_