Ruby on Rails的：如何获得的ActiveRecord，显示下一个ID（最后+ 1）？ [英] Ruby on Rails: How to get ActiveRecord to show the next id (last + 1)?

问题描述

有没有用ActiveRecord一个紧凑的方式来查询什么ID它会用接下来的一个对象是否将要被保存到数据库？在这样的SQL查询看起来是这样的：

  SELECT MAX（ID）+ 1 some_table;
 

解决方案

认为这应该工作：

  YourModel.last.id + 1
 

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;

解决方案

Think this should work:

YourModel.last.id + 1

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