Display STI subclasses

[saturnflyer]

I'm interested in displaying the subclasses defined for my STI models.
For example I'd like to show a relationship that User -> Event but if the Event class is STI I want to display those types

For example maybe my Event entity display is slightly different and lists the descendant classes with something like

  subgraph events {
    cluster=true;

    "Birthday";
    "Holiday";
  }

I haven't identified the dot syntax that I'd want yet but I'm also not sure how to work on creating a PR for this.
My impression is that I might need a special Attribute object that might apply to :type columns from ActiveRecord models.

I would love some direction on how to provide that as an option in this gem or (if that's not desirable) how to inject that feature so that I could make that happen for my needs.