Mongoid: Raise an exception and log errors if the identity map contains changed but unsaved objects after a request was processed.

gistfile1.rb

  unless Rails.env.production?
    after_filter do
      objects         = Mongoid::IdentityMap.values.flat_map(&:values)
      changed_objects = objects.select { |o| o.changes.except('updated_at', 'locked_at', 'locked_until').present? }
      unsaved_objects = changed_objects.select { |o| o.errors.empty? }
      unless unsaved_objects.empty?
        unsaved_objects.each do |obj|
          Rails.logger.error "Unsaved object: #{obj.inspect}\n  Changes: #{obj.changes.inspect}"
        end
        raise "Some changed objects have not been saved. See log for details."
      end
    end
  end