Rails eager loading of counts?

Question

Eager loading is nice with the include attribute

Post.find(:all, :include => :author)

I\'m wondering if you can also eager load counts, like

Answer 1

I just ran into this challenge and solved it this way:

def trainee_counts
   @trainee_counts ||= Hash[Trainee.group(:klass_id).count]
end

   # where the count is needed
   trainee_counts[klass_id].to_i

One call to database and does not load trainees.