title: Create to do list when a user is created in Devise
body: <p>I'm trying to build a to do list application, where when a user signs up through Devise, a pre-populated to do list is also created at the same time.</p>
  
  <p>I have the standard Devise controllers set up (confirmations, omniauth_callbacks, password, registrations, sessions, and unlocks), as well as a to_do_list controller and a list_item controller. Similarly, I have the User, ToDoList, and ListItem models.</p>
  
  <p>The user would belong to the to do list by default, and the list_items would belong to the to_do_list as well. (Later on, multiple users need to belong to the same to do list.) Where and how would I put the code that creates the one to_do_list and the multiple list_items?</p>
  
  <p>Thanks!</p>