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!