Rolf Timmermans

And just to illustrate how extreme "extreme" is, I have conducted the following benchmark with a simple model named Account with a default created_at column:

r...

As also reported by some people in the announcement blog post of Rails 3.0.3, there is a severe performance problem when using ActiveRecord queries with Ruby 1...

I tested for this behaviour recently with Rails edge. It seems to be solved by the fix to #5392.

Hi Emilio,

Your results seem consistent with mine insofar I've tried them (will do more tests later). What struck me the first time as well, is that in all case...

Also, note that calling .count on an association without :include does properly use cached column definitions. The first of the tests below succeeds, the second...

Hi Emilio,

Thank you for your answer. I was using the PostgreSQL adapter in my original application. If you try it in a real application, you'll see in the Rail...

It appears the problem also occurs with a simple call to .joins() in combination with has_many associations:

Article.joins(:comments).first # Retrieves column d...

While trying out Rails 3 for one of my applications, I have been bitten by the following.

When doing a calculation such as .count on has_many associations that ...