How to return different values from the same observable without multiple calls? I intend to subscribe just one time the firstObs$, but return the values and sumFromValues. combineLatest([ this.firstObs$, this.firstObs$.pipe( switchMap(someOperation => { return this.observableSumOperation(someOperation.first, someOperation.second) }) ), this.anotherObservable$, ])…
(1) I have a request in Firebase firestore where I get several 'nomBu' strings from a collection. OK (2) Then, with these recovered 'nomBu' strings, I make a second request to get metedata from another collection where the 'nomBu' is…
(1) I have a request in Firebase firestore where I get several 'nomBu' strings from a collection. OK (2) Then, with these recovered 'nomBu' strings, I make a second request to get metedata from another collection where the 'nomBu' is…
I am using an observable to retrieve data from an http like: handleError(error:any) { ... } getData() { return this._api_service.http.get<JSON>(this._url).pipe(retry(1), catchError(this.handleError)); } loadData() { this.getData().subscribe((data: {}) => { do_something_to_data(data); }); // here I want to do somethings after all the…
Below is the process I've been using to subscribe and then update a reactive form based on observable data. Maybe there's a way to fix the problem without subscribing to the observable and changing the value. @Component({ selector: 'app-my-component', template:…
From the https://firebase.google.com/docs/firestore/query-data/queries documentation snippet, Im unable to get the results as an Observable import { collectionGroup, query, where, getDocs } from "firebase/firestore"; const museums = query(collectionGroup(db, 'landmarks'), where('type', '==', 'museum')); const querySnapshot = await getDocs(museums); querySnapshot.forEach((doc) => { console.log(doc.id,…
I am trying to use this service getTodaysRoute() where I figure out what is today's route node key using .equalTo and from what I understand then I have to use this .on function snapshot from which then I can finally…
I'm looking for a hand with making an observable contain only distinct records. I'm using the observable in an angular mat-autocomplete with an async pipe and querying firebase with the user's typed-in values to bring back the list of options.…
I am learning Angular (version 8) and stuck with RxJS. Precisely, I am unable to read a particular key from an Observable. Here is my User interface: export interface User { id: Number; email: String; first_name: String; last_name: String; avatar:…
This is part of my first Angular 4 project. I am currently able to call the searchCall function just fine from a search bar, but the data being stored in tweetsData doesn't seem to be in scope with my *ngFor…