How do I get ActiveRecord to show the next id (last + 1) in Ruby on Rails?

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;

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How do I get ActiveRecord to show the next id (last + 1) in Ruby on Rails?

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