Angular2 rc1 ngFor“无法找到类型为'object'的不同支持对象'[object Object]'

Question

我不知道如何通过我的对象对象（但它应该是数组）： Data structure

Error: Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays.

视图结构：

<a *ngFor="let msg of messages " href class="clearfix"> 
      <div class="img-area"><img [ngClass]="{'photo-msg-item': !msg.from}" 
            src="{{ (msg.from || (msg.from | baProfilePicture)) }}"></div> 
      <div class="msg-area"> 
      <div>{{ msg.message }}</div> 
      <span>{{ msg.send_date }}</span> 
      </div> 
     </a> 

组件：

public notifications:Array<Object>; 
    public messages:Array<Message>; 
    public data_error: Boolean = false; 
    constructor(private _baMsgCenterService:BaMsgCenterService) { 
     this.messages = this._baMsgCenterService.getMessages().subscribe(
     (messagess) => { 

      let result:Array<Message> = []; 
      if (messagess) { 
      messagess.forEach((message) => { 
      result.push(
       new Message(message[0], 
         message[1], 
         message[2], 
         message[3], 
         message[4]) 
       ); 
      }); 
     } 
     this.messages = result; 
     }, 
     err => { this.data_error = true} 
    ); 

Answer 1

第I你的问题所在，在这条线的油墨：

this.messages = this._baMsgCenterService.getMessages().subscribe(

看来你要Subscription对象设为您的messages变量（subscribe方法返回Subscription对象https://github.com/ReactiveX/rxjs/blob/master/src/Observable.ts#L87）

所以，你必须删除此方影响。它应该是：

this._baMsgCenterService.getMessages().subscribe(

Answer 2

<a *ngFor="let msg of messages | async " href class="clearfix"> 

尝试加入一些 “异步”

见here。