如何让 ActiveRecord 在 Ruby on Rails 中显示下一个 id (last + 1)? [英] How do I get ActiveRecord to show the next id (last + 1) in Ruby on Rails?

问题描述

如果一个对象将被持久化到数据库中，ActiveRecord 是否有一种紧凑的方式来查询它接下来将使用的 id?在 SQL 中，这样的查询类似于:

Is there a compact way with ActiveRecord to query for what id it's going to use next if an object was going to be persisted to the database? In SQL, a query like this would look something like:

SELECT max(id) + 1 FROM some_table;

推荐答案

这里略有修改 Taryn East'版本:

Here is slightly modified Taryn East's version:

Model.maximum(:id).next

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