Using to_json to include nested information from a method

I have a nested method that I'd like to output via to_json: `Venue` has a method called `published_events` that returns events that are published: ``` def published_events events_array = [] self.events.each do |event| if event.published events_array << event end end events_array end ``` `Event` has a `to_param` method on it that I'd like to include in the json rendering of `Venue`: ``` format.json { render :json => @venue.to_json(:methods => :published_events => {:include => :to_param}) } ``` This, of course, doesn't work to include the to_param method of events. Is there another way I should go about this or will I need to build my own json? Is there a way in the `published_events` method that I can include the to_param method?