将rails版本升级到5。
控制台/ rspec中的 object.save导致了很多弃用消息。其中一些是：
DEPRECATION WARNING: The behavior of `changed` inside of after callbacks will be changing in the next version of Rails. The new return value will reflect the behavior of calling the method after `save` returned (e.g. the opposite of what it returns now). To maintain the current behavior, use `saved_changes.keys` instead. (called from block ******)
DEPRECATION WARNING: The behavior of `changed_attributes` inside of after callbacks will be changing in the next version of Rails. The new return value will reflect the behavior of calling the method after `save` returned (e.g. the opposite of what it returns now). To maintain the current behavior, use `saved_changes.transform_values(&:first)` instead. (called from block ******)
DEPRECATION WARNING: The behavior of `changes` inside of after callbacks will be changing in the next version of Rails. The new return value will reflect the behavior of calling the method after `save` returned (e.g. the opposite of what it returns now). To maintain the current behavior, use `saved_changes` instead. (called from block ******)
DEPRECATION WARNING: The behavior of `attribute_change` inside of after callbacks will be changing in the next version of Rails. The new return value will reflect the behavior of calling the method after `save` returned (e.g. the opposite of what it returns now). To maintain the current behavior, use `saved_change_to_attribute` instead. (called from block ******)
是否有找到导致这些弃用消息的原因的方法？
我确实尝试挖掘撬宝石，但没有成功。
对象类中没有before_或after_回调。