Andrew Hughes
RepositoryRestConfigurerAdapter is just a slightly older. The repo uses Spring 2.0.6. The tutorial is more up to date (2.1.0). However, both should work, and all the class does is configure the REST API to expose IDs in the JSON. Neither will affect the basic function of the Spring Data REST service.
I just tested the code again and it works for me. Make sure you stopped and re-started your spring boot project, and that you created both the Todo.java resource class and the TodoRepository.java repository class. Otherwise, what version of Java are you on? Can you post your code somewhere so that I can try it out?