Ember Fundamentals - Actions: Creating and persisting data

This topic is for the [Action - Creating and persisting data] exercise in the [Ember Fundamentals] trail. Post any questions, corrections, or pointers you have to share with other Upcase subscribers.
[Action - Creating and persisting data]: https://exercises.upcase.com/exercises/actions-creating-and-persisting-data
[Ember Fundamentals]: Ember Fundamentals (Under Development) | Online Tutorial by thoughtbot