To test how it works:

$ npm install
$ npm start

1. Go to http://locahost:4200
2. Open the console for helpful messages
3. Edit the person name and change the boss (belongs to)
4. Click on any of the buttons that reload the model from the server
5. See that "name" remains unchanged but boss changes
6. Click on the link to "Navigate to another route" to see that the changes persist across routes