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有什么区别：before_save和：before_update Active Record回调？

[英]What is the difference between the :before_save and :before_update Active Record callbacks?

原文 2013-08-27 16:18:47 7 1 ruby-on-rails/ activerecord/ callback/ ruby-on-rails-4

Could someone please explain to me the difference between the :before_save and :before_update Active Record callbacks in Ruby on Rails 4? 有人可以向我解释:before_update Ruby on Rails 4中的:before_save和:before_update Active Record回调之间的区别吗？

I read through the official documentation on Active Record callbacks, but I couldn't find a granular-enough explanation. 我阅读了有关Active Record回调的官方文档，但我找不到足够精细的解释。

1 个解决方案

:before_save is called everytime a record is inserted/updated in the database. :before_save每次在数据库中插入/更新记录时都会调用:before_save 。 So it is called on every save whether its a new record or existing record. 因此，无论是新记录还是现有记录，都会在每次保存时调用它。

:before_update is called only when the record is updated & never on new record. :before_update仅在更新记录:before_update调用:before_update并且永远不会在新记录上调用。

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