选择动态对象选项不在angular2中工作

Question

查看我创建的plunker代码。当我点击切换显示按钮2次我应该得到所选项目。此示例代码是一般angular2应用程序

的组件的一部分

@Component({
  selector: 'my-app',
  template: `<div *ngIf="show"><select [(ngModel)]="selectedDeviceObj"  name="sel3">
    <option [ngValue]="i" *ngFor="let i of deviceObjects">{{i.name}}</option>
  </select></div>
  {{selectedDeviceObj | json}}

  <br/><br/><br/>
  <button (click)="changeShow()">toggle show</button>
  `
  //directives: []
})
export class AppComponent {
  changeShow(){  
  this.deviceObjects = [{name: 1}, {name: 2}, {name: 3}];
    this.show=!this.show;
  }

  show=true;
  title = "Angular 2 RC.4 - select";
  devices = 'one two three'.split(' ');
  selectedDevice = 'two';
  deviceObjects = [{name: 1}, {name: 2}, {name: 3}];
  selectedDeviceObj = this.deviceObjects[1];
  //constructor() { console.clear(); }
  onChange(newValue) {
    console.log(newValue);
    this.selectedDevice = newValue;
    // ... do other stuff here ...
  }
  onChangeObj(newObj) {
    console.log(newObj);
    this.selectedDeviceObj = newObj;
    // ... do other stuff here ...

  }
}