可观察数组* ngFor指令Angular

Question

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

I'm trying to set up a Basket store to provide data to my BasketPage.

In my service i got :

nourritureArrayTest: Nourriture[] = [];
getNourriturePanier(): Observable<Nourriture[]> {
  return of(this.nourritureArrayTest)
}

in my Basket Page ts :

nourriturePanierTest: Observable<Nourriture[]>
ngOnInit() {
  this.nourriturePanierTest= this.panierService.getNourriturePanier()
}

nourritureArrayTest is an array of object of type

in my Basket.html

<div *ngFor="let extra of nourriturePanierTest | async">
<p>{{extra.name}}</p></div>

Answer 1

nourriturePanierTest is an observable. You need to store this observable in some array and then use that array inside an ngFor.

ngFor only works on Array.

I've added some code for your help.

nourriturePanierTest: Nourriture[];
ngOnInit() {
this.nourriturePanierTest= this.panierService.getNourriturePanier().subscribe(res=>{
this.nourriturePanierTest= res })
}

Answer 2

You have to subscribe to the observable instead of assigning it to a variable:

ngOnInit() {
  this.panierService.getNourriturePanier().subscribe(res=>{
    this.nourriturePanierTest= res
  })
}

and it will work if this.nourritureArrayTest is an array