What is the process of converting the Object type returned from an Observable to an array of objects in Angular?

When utilizing the GET method to retrieve information, I have encountered a problem. Here is the code snippet:

constructor(private http: HttpClient) { }

items: Item[];
stuff: any[];

ngOnInit() {
  const url = ...;
  this.http.get(url)
    .subscribe(next => {
      console.log(next);
      console.log(next.length);
      this.items = next;
      this.stuff = next;
    });
}

Upon inspecting the console, I can see that there are 6 elements present in the response. However, when attempting to display these elements using the ngFor directive, nothing appears on the screen or only a single line shows up.

<div ngFor="let item of items">
  ->{{item?.id}}
</div>

<div ngFor="let item of stuff">
  ->{{item?.id}} 
</div>

I am aware that one workaround is to expose the data through a service as demonstrated here. Nevertheless, I am also interested in finding a quick solution to this issue and gaining knowledge on how to handle it properly since the same problem might arise during the service implementation.

I have attempted utilizing map and forEach on the next value, but I encountered an error stating that Object is not an array. The IDE suggested adding a variable array to the syntax like next.array.forEach, but that did not yield any results and instead showed errors visibly.

What steps should I take next? (Unsure about what terms to research at this point.)

Answer №1

elephantObservArray: Observable<Elephant[]>;
elephantArray: Array<Elephant>;

this.elephantObservArray.subscribe(eleph=> {
this.elephantArray = eleph;

console.log(this.elephantArray);

and to be joyful...

Or get specialized:

elephant: Elephant= null;

getElephant(): Elephant{
    this.elephant = new Elephant();

this._http.get<Elephant>(...your ws link)
      .subscribe(data => {
        this.elephant = data;

Answer №2

One option is to first convert the object into an array before sending it to the template. You can find more information on how to achieve this here.

Alternatively, you could utilize a custom pipe to change the object into an array.

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