How to get the latest record from each group in ActiveRecord?

Question

In my Ruby on Rails application I have a database structure like this:

Project.create(:group => \"1\", :date => \"2014-01-01\")
Project.create(:group =         


        

Answer 1

I spent some time battling this and thought I'd share what I found to be the cleanest and stunningly easy solution (assuming date or other sorting field contains unique values):

Project.group(:group).maximum(:date)

Hat tip to qarol for posting this in this comment.