install activeadmin
set default mailer options and index root

active admin gives tips on "Some setup you must do manually if you
haven't yet:" after install.

1. Ensure you have defined default url options in your environments files.
Here is an example of default_url_options appropriate for a development
environment in config/environments/development.rb:
config.action_mailer.default_url_options = { :host => ‘localhost:3000’ }

In production, :host should be set to the actual host of your application.

2. Ensure you have defined root_url to something in your config/routes.rb. For example:
root :to => “home#index”
scaffolding for patient, appointment, procedure

rails generate scaffold Patient first_name:string last_name:string email:string
rails generate scaffold Procedure name:string code:string description:text
rails generate scaffold Appointment patient_id:integer procedure_id:integer admin_user_id:integer scheduled_datetime:datetime