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Active Record 回调, after_validation, before_save, around_save, before…
Active Record 回调
after_validation
before_save
around_save
before_create
around_create
after_create
after_save
before_validation
after_validation
创建对象
更新对象
before_save
around_save
before_update
around_update
after_update
before_validation
after_save
销毁对象
before_destroy
around_destroy
after_destroy