Property 'pipe' does not exist on type 'AngularFireObject<{}>'

Question

I\'m a beginner to Angular. I\'m watching the tutorial of Mosh Hamedani using the Angular version 6 but the problem is the tutorial version is 4. I\'m working on the e-comme

Answer 1

maybe instead of changing this line to return this.db.object('/shopping-carts/' + cartId + '/items/' + productId).valueChanges();

leave it as it was return this.db.object('/shopping-carts/' + cartId + '/items/' + productId) then in the function you are calling the getItem function before subscribing to it you can add value changes there should be something like

`private getItem(cartId: string, productId: string){
        return this.db.object('/shopping-carts/' + cartId + '/items/' + productId);
    }
 async addToCart(product: Product){
        let cartId = await this.getOrCreateCartId();
        let item$ = this.getItem(cartId, product.key).valueChanges();
        item$.pipe(take(1)).subscribe(item => {
            item$.update({ product: product, quantity:(item.quantity || 0) + 1 });
        });
    }`