mixing mongoid and activemodel observers

buy.rb

class Buy
  include Mongoid::Document
  include Mongoid::Timestamps
  include Mongoid::I18n
  include Mongoid::Versioning
  extend ActiveModel::Translation
  include ActiveModel::Observing

.....
....
end

OfferObserver

class OfferObserver < ActiveRecord::Observer
  observe :sell, :project, :buy

  # we have to do this manually in Buy - ugly but true

  def after_save record
    record.contact.make_contact_client(record, true)
    record.contact.calc_offers(record)
  end

  def after_destroy record
    record.contact.make_contact_client(record, false) unless record.contact.has_offers_for_user(record.user)
    record.contact.calc_offers(record)
  end

end

So is this actually working for you? Doesn't seem to do it for me.

yes it works for me.
l am with mongoid beta.19 if this would help you.