Rails console helpers to put in your .irbrc that will return an array of AR model constants and an array of controller constants respectively.

models_and_controllers_helpers.rb

def self.models
  ActiveRecord::Base
    .send(:subclasses)
    .map { |model| model.name.constantize }
end

def self.controllers
  Rails.application.routes.routes
    .select  { |r| r.defaults[:controller].present? }
    .uniq    { |r| r.defaults[:controller] }
    .sort_by { |r| r.defaults[:controller] }
    .map     { |r| "#{r.defaults[:controller].split('/').map { |x| x.capitalize }.join("::").camelize }Controller".constantize }
end

I can't compare the Journey::Route instances so I have to dereference to get the controller value. I don't think this is quite as concise as my original example and requires repeating the dereference inside each block.