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

In MySQL at least, it is faster to do these as two separate calls because you get to avoid the join. I know this doesn't answer your question, but it seems like you're trying to get better speed and doing

Post.find ...

Then

post.comments.count

Is faster and more memory efficient (for the database) than if you retrieve both in one query.