How do you insert a “reference” value into firestore?

Question

I\'m trying to insert a document into a collection. I want the document to have a attribute of type reference to insert into the collection. But every time I in

Answer 1

This is the model class to store in firestore.

import { AngularFirestore, DocumentReference } from '@angular/fire/firestore';

export class FlightLeg {
  date: string;
  type: string;

  fromRef: DocumentReference; // AYT Airport object's KEY in Firestore
  toRef: DocumentReference;   // IST  {key:"IST", name:"Istanbul Ataturk Airport" }
}

I need to store FlightLeg object with reference value. In order to do this:

export class FlightRequestComponent {

  constructor(private srvc:FlightReqService, private db: AngularFirestore) { }

  addFlightLeg() {
    const flightLeg = {
      date: this.flightDate.toLocaleString(),
      type: this.flightRevenue,
      fromRef: this.db.doc('/IATACodeList/' + this.flightFrom).ref,
      toRef: this.db.doc('/IATACodeList/' + this.flightTo).ref,
    } as FlightLeg
    .
    ..
    this.srvc.saveRequest(flightLeg);
  }

The service which can save the object with referenced to another object into firestore:

export class FlightReqService {
   .
   ..
   ...
  saveRequest(request: FlightRequest) {
    this.db.collection(this.collRequest)
           .add(req).then(ref => {
              console.log("Saved object: ", ref)
           })
   .
   ..
   ...
  }
}