After digging a bit deeper we were able to solve this issue. The details of the fix are explained here
http://stackoverflow.com/questions/4522288/rails-3-activerecordrelation-random-associations-behavior The code examples there apply only to rails 3.0.3, but the idea should be the same for any other rails 3 release. Basically the belongs_to association files are using the old finder methods. these old finder methods seem to return an ActiveRecord::Relation object at random times. Our solution was to override the find_target method and change the finders used for the new Rails 3 format (where(...), etc) through a couple of initializers. Hopefully similar corrections will be applied to the next rails release. Regards -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-t...@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.