Angular 2 Observable.forkJoin this._subscribe 不是 [null] 中的函数

Question

我有这个 Angular2 组件，我尝试使用 PersonServie 发出两个 HTTP 并行请求(效果很好)。但是 Observable.forkJoin 方法会抛出此错误:EXCEPTION: TypeError: this._subscribe is not a function in [null]

评估 getIdentificationTypes() 和 getPerson() 函数，每个函数返回一个 Observable 对象。

我错过了什么？

 import { Component, OnInit } from 'angular2/core';
    import { Router, RouteParams } from 'angular2/router';
    import {ROUTER_DIRECTIVES, ROUTER_PROVIDERS} from 'angular2/router';
    import { Observable } from 'rxjs/Rx';
    import 'rxjs/Rx';

    // more imports for models and other components//


    @Component({
        selector: 'my-coponent',
        templateUrl: 'template',
        directives: [ROUTER_DIRECTIVES]
    })

    export class MyComponent implements OnInit {
           public identificationTypes: IdentificationType[];
           public person : Person;
       // some public and private properties here //

        constructor(
            private _router: Router,
            private  _routeParams : RouteParams,
            private _personService: PersonServie
        ){}

        ngOnInit() {
            let id= (this._routeParams.get('id'));
            this._id= id? +id: 0;

            Observable.forkJoin([
               this.getIdentificationTypes(),
               this.getPerson(this._id)
            ]).subscribe(data =>{
                this.identificationTypes= data[0];
                this.person= data[1];              
            });
        }

        private getIdentificationTypes(){
            return this._generalService.getIdentifiacitonTypes();
        }

        private getPerson(person: number){
            if(athleteId == 0){                
                let person = new Person();
                return Observable.create(person );
            }


            return this._personService.getPerson(athleteId);
        }
}

Answer 1

尝试使用 Observable.of(person) 而不是错误使用的 Observable.create。