The technical debt has been piling up fast in our FeedComponent. It’s time to refactor that business logic out into services - and today on the show we’ll teach you how to get started.
(Spoiler: If you’ve done any Spring or Guice or Java EE6+ - this will be a piece of cake!)
You can always grab tagged source code on the GitHub repo which will be tagged day1, day2, etc.
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Here’s the script so you can follow along at home:
[ ] If you’ve used Spring or @Inject, this is all super familiar!
[ ] First we’ll create a user service
ng g s User
[ ] Note the @Injectable
[ ] Then we’ll implement a current user method
getCurrentUser() : string {
return 'Glen';
}
[ ] Let’s write a test for that service (using Jasmin)
expect(service.getCurrentUser()).toBe('Glenz');
[ ] Run the test
ng test --build=false --watch=false
[ ] Fix the test
[ ] Inject the UserService into the FeedComponent
import { UserService } from '../user.service';
providers: [UserService],
constructor(private userService : UserService) { }
[ ] Replace all our backing component refs to ‘Glen’
[ ] Replace all our view component refs to ‘Glen’
[ ] Move the provides to the ng Module level
[ ] Talk about implications of exporting ngModule services
[ ] Cue Applause. Tomorrow we’ll tackle the FeedService