ActiveRecord::CallbacksActive Record Callbacks Callbacks are hooks into the life cycle of an Active Record object that allow you to trigger logic before or after a change in the object state. This can be used to make sure that associated and dependent objects are deleted when ActiveRecord::Base#destroy is called (by overwriting before_destroy) or to massage attributes before they’re validated (by overwriting before_vali
ITトレメ Rails 3 技術者認定ブロンズ試験 － ＠IT自分戦略研究所
