I''m trying out Rails 3 with MongoMapper for a new application, and have run into a bug when both MongoMapper::Document and ActiveModel::Validations are used in the same model, in this case job.rb. I can create a new model with the various validations I require, but when I attempt to save it I get: NoMethodError: undefined method `_run_before_save_callbacks'' for #<Job:0x007fe033a42958> Google doesn''t come up with much for this other than suggestions to rely only upon MongoMapper, which I would rather not do. So, if anyone can suggest a workaround it would be very useful. Thanks! -- Posted via http://www.ruby-forum.com/. -- 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-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.