如何确定是否刚刚创建或更新after_save的创纪录 [英] How to determine if a record is just created or updated in after_save

问题描述

在#new_record？函数确定一个记录已被保存。但它始终是假的 after_save的挂钩。有没有一种方法，以确定该记录是否是一个新创建的记录或旧的更新？

The #new_record? function determines if a record has been saved. But it is always false in the after_save hook. Is there a way to determine whether the record is a newly created record or an old one from update?

我希望不要用另一个回调，如 before_create 来设置标志的模型或需要其他查询到数据库。

I'm hoping not to use another callback such as before_create to set a flag in the model or require another query into the db.

任何意见是AP preciated。

Any advice is appreciated.

编辑：需要确定它 after_save的挂钩，为我的特殊用途的情况下，不存在的updated_at 或 updated_on 时间戳

Need to determine it in after_save hook, and for my particular use case, there is no updated_at or updated_on timestamp

推荐答案

我一直在寻找使用一个 after_save的回调。

I was looking to use this for an after_save callback.

有一个简单的解决方案是使用 id_changed？（因为它不会改变更新），甚至 created_at_changed？如果时间戳列是present。

A simpler solution is to use id_changed? (since it won't change on update) or even created_at_changed? if timestamp columns are present.

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