我有一个具有此方法的服务：
export class TestModelService {
public testModel: TestModel;
constructor( @Inject(Http) public http: Http) {
}
public fetchModel(uuid: string = undefined): Observable<string> {
if(!uuid) {
//return Observable of JSON.stringify(new TestModel());
}
else {
return this.http.get("http://localhost:8080/myapp/api/model/" + uuid)
.map(res => res.text());
}
}
}
export class MyComponent {
testModel: TestModel;
testModelService: TestModelService;
constructor(@Inject(TestModelService) testModelService) {
this.testModelService = testModelService;
testService.fetchModel("29f4fddc-155a-4f26-9db6-5a431ecd5d44").subscribe(
data => { this.testModel = FactModel.fromJson(JSON.parse(data)); },err => console.log(err)
);
}
}
如果一个对象来自服务器,这是有效的.但是我试图创建一个observable,它将使用给定的现有subscribe()调用静态字符串(当testModelService.fetchModel()没有给出一个uuid时会发生这种情况)因此在这两种情况下都有无缝处理.这可能吗？
也许您可以尝试使用Observable类的
of方法：
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';
public fetchModel(uuid: string = undefined): Observable<string> {
if(!uuid) {
return Observable.of(new TestModel()).map(o => JSON.stringify(o));
}
else {
return this.http.get("http://localhost:8080/myapp/api/model/" + uuid)
.map(res => res.text());
}
}
