在保存之前获取 Rails 模型的 ID...? [英] Get ID of Rails Model before saving...?

问题描述

如何在保存之前获取 Rails 模型的 id?

How do you get the id of a rails model before it is saved?

例如，如果我创建了一个新的模型实例，如何在保存之前获取其 ID?

For example, if I create a new model instance, how can I get its ID before it is saved?

我知道 ID 是在保存时根据数据库创建的，但有解决方法吗?

I know that the id is created onsave and according to the database but is there a workaround?

推荐答案

通常，当人们认为他们需要这样做时，他们实际上并不需要这样做.就像约翰说的那样，解释你想要做什么，有人可能会建议一种方法来做到这一点，而无需事先知道 ID.

Usually when people think they need to do this they actually do not need to do it. Like John says, explain what you are trying to do and someone can probably suggest a way to do it without having to know the id in advance.

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