Setting up STI subclass routes programmatically

preload_sti_models.rb

if Rails.env.development?
  # Make sure we preload the parent and children class in development
  # since classes aren't pre-cached. Otherwise we get an error when 
  # accessing a child class before we access the parent.
  %w[kase coaching_kase training_kase alpha_kase].each do |c|
    require_dependency File.join("app","models","#{c}.rb")
  end
end

routes.rb

# This will work without any prerequisites in any environment where classes are cached,
# but in development you will need to add an initializer that preloads the subclass files.
resources :kases
Kase.subclasses.each do |klass|
  k = klass.name.pluralize.underscore.to_sym
  resources k, :controller => 'kases'
end

thanks, the sti preloading helped me out in rails 4