[md-input] Impossible to use safe navigation operator?

[vapits]

Bug, feature request, or proposal:

Bug (?)

What is the expected behavior?

<md-input [(ngModel)]="activeApp?.name"></md-input> should work.

activeApp is an observarbe in my code:

export class ProjectPropertiesComponent implements OnInit {

  sub: any;
  activeApp: Observable<any>;
  constructor(
    private route: ActivatedRoute,
    private appsService: AppsService) {
    this.route = route;
    this.appsService = appsService;
   }

  ngOnInit() {
    this.getProject();
  }

  getProject() {
    this.sub = this.route.parent.params.subscribe(params => {
      let id = params['id'];
      this.appsService.getApp(id)
        .subscribe(
          data => this.activeApp = data
        );
    });
  }

}

What is the current behavior?

Plunker: http://plnkr.co/edit/Ua7KKEOGCl0nyMzTTwkq?p=preview
(check console)

Which versions of Angular, Material, OS, browsers are affected?

Angular version: 2.0.0-rc.5
Angular material versions: 2.0.0-alpha.7-4

Is there anything else we should know?

If I don't use the safe operator it works as it should.

[vapits]

I find out that ? safe-navigation operator can't be used as ng-model does the check, Is that truth? The thing is that this is not working when I'm getting data from a http request, so is this a bug or not?

[vapits]

Workaround:

In my code I just initialise the property I wanted to display in the md-input in the constructor.

That solved my problem of course. So maybe this is a feature instead of bug.

Please choose and set labels or close the issue.

Thank you

[jelbourn]

This is the intended behavior of Angular itself (not specific to material). The two-way binding consists of both reading the value and writing the value, where the ?. operator doesn't make sense for assignments.

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