def on_create
      @model_class.after_create { |r|
        r.paper_trail.record_create if r.paper_trail.save_version?
      }
      return if @model_class.paper_trail_options[:on].include?(:create)
      @model_class.paper_trail_options[:on] << :create
    end
def on_create
      @model_class.after_create { |r|
        r.paper_trail.record_create if r.paper_trail.save_version?
      }
      return if @model_class.paper_trail_options[:on].include?(:create)
      @model_class.paper_trail_options[:on] << :create
    end
Adds a callback that records a version after a "create" event.

 @api public