shopping

shoppingservice.ts

import { ShoppingListItem } from '../models';
import { BehaviorSubject, Observable } from 'rxjs';

export class ShoppingDataService {

    private fakeData: ShoppingListItem[] = [
        { id: '1', description: 'Ice Cream Cones', purchased: false },
        { id: '2', description: 'Shoe Polish', purchased: true }
    ];
    private maxId = 3;

    private subject = new BehaviorSubject<ShoppingListItem[]>(this.fakeData);

    getObservable(): Observable<ShoppingListItem[]> {
        return this.subject.asObservable();
    }

    addItem(description: string): void {
        this.fakeData.push({ id: (this.maxId++).toString(), description, purchased: false });
        // this would be some async code that goes to the api.
        this.subject.next(this.fakeData);
    }

    markItemAsPurchased(item: ShoppingListItem): void {
        const storedItem = this.fakeData.filter(i => i.id === item.id)[0].purchased = true;
        // this would be some async code that goes to the api.

        this.subject.next(this.fakeData);
    }
}