How to get last N records with activerecord?

Question

With :limit in query, I will get first N records. What is the easiest way to get last N records?

Answer 1

If you have a default scope in your model that specifies an ascending order in Rails 3 you'll need to use reorder rather than order as specified by Arthur Neves above:

Something.limit(5).reorder('id desc')

or

Something.reorder('id desc').limit(5)