Angular 为可观测项列表确定错误所属的可观测项

从后端，我从不发送

404状态

来获取列表，因此，在本例中，我可以确定

404

仅来自第二个可观察的。但如果我想在

error

方法中有另一个逻辑，我需要知道它是从哪个可观察对象发生的。我怎么能做到？谢谢

您可以将每个观察值包装在

catchError

中，并分别对它们进行处理：

const obs1$ = this.service.getAllSources();
const obs2$ = this.service.getWidgetById(1);

combineLatest([obs1$, obs2$])
   .subscribe(pair => {
      const sources = pair[0];
      const widget = pair[1];
      // do stuff
   }, err => {
       // err can be from first or second observable, but which?    
       if (err.status === 404) {
          // here I need to know for which observable the error is ocurred ?!?!
          this.utilsService.alert('Widget with id 1 not found');
       }
       
       if (err.status === 500) {
          // here, I need to know from which observable occured
       }
   });

或者您可以标记错误并在

订阅
中处理它们。类smth

combineLatest([
obs1$.pipe(catchError(e => ...)), 
obs2$.pipe(catchError(e => ...)),
]).subscribe(...)

您可以在
catchError
中包装每个可观察到的对象，并分别对它们进行处理：

const obs1$ = this.service.getAllSources();
const obs2$ = this.service.getWidgetById(1);

combineLatest([obs1$, obs2$])
   .subscribe(pair => {
      const sources = pair[0];
      const widget = pair[1];
      // do stuff
   }, err => {
       // err can be from first or second observable, but which?    
       if (err.status === 404) {
          // here I need to know for which observable the error is ocurred ?!?!
          this.utilsService.alert('Widget with id 1 not found');
       }
       
       if (err.status === 500) {
          // here, I need to know from which observable occured
       }
   });

或者您可以标记错误并在
订阅
中处理它们。类smth

combineLatest([
obs1$.pipe(catchError(e => ...)), 
obs2$.pipe(catchError(e => ...)),
]).subscribe(...)

那是个好主意。谢谢这是个好主意。谢谢