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

Question

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

Answer 1

Get the largest id on the table

YourModel.maximum(:id)

This will run the following sql

SELECT MAX("your_models"."id") AS max_id FROM "your_models"

Convert the result to an integer by calling to_i. This is important as for an empty table the above max command will return nil. Fortunately nil.to_i returns 0.

Now to get the next available id, just add 1 +1`

The final result:

YourModal.maximum(:id).to_i+1