As the title says, deleted models returns nil on calling to_param.

I'm using Mongoid::Paranoia to implement a simple trash mechanism in my web app, and the whole trash site can't be displayed because the generation of urls fails. I know, it's standard in ActiveModel, but together with Mongoid::Paranoia it makes no sense at all to return nil calling to_param on deleted models.

class Model
  include Mongoid::Document
  include Mongoid::Paranoia
end

model = Model.create
model.destroy

model.to_param
  # => nil