What is the process for converting an observable array into a regular array and then retrieving that transformed array?

I'm currently attempting to convert an observable array into a regular array and then return the new array using the spread operator within the `get` function.

I initially tried manually converting the observable array before subscribing with the map operator, but I couldn't find a solution. It still remains as an Observable of type void. How can I convert this observable array into a usable array so that I can utilize the spread operator in `get orders()` where I need to return an array type for a calculation?

//in grid.service.ts
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Order } from '../order/order.model';


@Injectable({
    providedIn: 'root'
})
export class OrderGridService{

constructor(private http: HttpClient){}

private _orders: Order[];

getAllOrder(): Observable<Order[]> {
  return this.http.get<Order[]>(this._orderURL + "/" + 
   this.userID + "/" + this.currentUservalueToken);
 };

    get orders(): Order[] {
        return [...this._orders];
    }

}

I need to assign the response of the html request performed in the function `getAllOrder()` to the variable `_orders`. However, it is returning an Observable of `Order[]` instead of an array. This prevents me from simply returning `[...this._orders]`. I hope my issue is clear.. Any advice would be greatly appreciated! Thank you.

Answer №1

It is possible to implement something similar to this code, but keep in mind that it uses asynchronous operations. Proceed with caution.

// Example code in grid.service.ts
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Order } from '../order/order.model';


@Injectable({
    providedIn: 'root'
})
export class OrderGridService{

   constructor(private http: HttpClient){
      // Upon initialization of this service, retrieve data from an API
      this.getAllOrder().subscribe(data => {
         this._orders = data;
      })
   }

   private _orders: Order[];

   getAllOrder(): Observable<Order[]> {
      return this.http.get<Order[]>(this._orderURL + "/" + 
         this.userID + "/" + this.currentUservalueToken);
   };

   get orders(): Order[] {
      return [...this._orders];
   }
}

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