Angular 16: implementing Component Re-rendering After Service Data Update
I'm sure I'm missing something obvious here, but I'm working with an scenario with component re-rendering in Angular 16 after updating data in a service. I have a simple service that fetches user data from an API and returns the data as an observable. In my component, I'm subscribing to this observable and binding the data to the template. However, when the data in the service is updated (e.g., after a user submits a form), the component doesn't seem to re-render with the latest data. Here's a simplified version of my service: ```typescript import { Injectable } from '@angular/core'; import { BehaviorSubject } from 'rxjs'; @Injectable({ providedIn: 'root' }) export class UserService { private userSubject = new BehaviorSubject<User>(null); constructor() { this.fetchUser(); // Initially fetches user data } fetchUser() { // Simulated API call setTimeout(() => { const user: User = { name: 'John Doe', age: 30 }; this.userSubject.next(user); }, 1000); } updateUser(user: User) { this.userSubject.next(user); } getUser() { return this.userSubject.asObservable(); } } ``` In my component, I subscribe to the user data like this: ```typescript import { Component, OnInit } from '@angular/core'; import { UserService } from './user.service'; @Component({ selector: 'app-user', template: `<div *ngIf="user">Name: {{ user.name }}, Age: {{ user.age }}</div>`, }) export class UserComponent implements OnInit { user: User; constructor(private userService: UserService) {} ngOnInit() { this.userService.getUser().subscribe((data) => { this.user = data; }); } } ``` The question arises when I call `userService.updateUser({ name: 'Jane Smith', age: 28 })` from another component after a form submission. The component doesn't update the displayed data, and I see that the subscription in `UserComponent` is not firing again. I tried calling `fetchUser()` again in the `updateUser()` method to see if that would trigger the change but to no avail. I also checked that there are no errors in the console, and the observable seems to be emitting values correctly. Any insights into why the component isn't re-rendering with the updated data, or how to force it to recognize changes? This is part of a larger API I'm building. I'd really appreciate any guidance on this.