Борис Пеньковский

resources :users do
  resources :articles
end

class Chapter < ActiveRecord::Base
  # !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  # Do not forget to automatically `touch` parent object from associations
  belongs_to :book, touch: true
  # !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
end

Thread.new do
  call_some_method(params)
end