Utilizing Angular RXJS to generate an array consisting of three different observable streams

I am trying to use three different streams to create an array of each one. For example:

[homePage, mainNavigation, loan_originators]

However, currently only mainNavigation is being returned.

  const homePage = this.flamelinkService.getData('homePage');
  const mainNavigation = this.flamelinkService.getNav('mainNavigation');
  const loan_originators = this.catalogApiService.get('loan_originators', qry);

  return mainNavigation.pipe(
    concat( homePage, loan_originators),
    first(),
    tap( async navResolveData => {
      // navResolveData = navResolveData[0];
      _log('== Navigation Data Resolver ==> ', 't', navResolveData);
      if (isPlatformServer(this.platformId)) {
        this.transferState.set(INFO_KEY, navResolveData);
      }
    }),
  );

I have also tried using forkJoin, but it doesn't seem to work.

  const homePage = this.flamelinkService.getData('homePage');
  const mainNavigation = this.flamelinkService.getNav('mainNavigation');
  const loan_originators = this.catalogApiService.get('loan_originators', qry);
  return forkJoin([homePage, loan_originators, mainNavigation]).pipe(
    first(),
    tap( async navResolveData => {
      // navResolveData = navResolveData[0];
      _log('== Navigation Data Resolver ==> ', 't', navResolveData);
      if (isPlatformServer(this.platformId)) {
        this.transferState.set(INFO_KEY, navResolveData);
      }
    }),
  );

Answer №1

To handle this situation, you can implement forkJoin

forkJoin(
  [
   this.flamelinkService.retrieveData('homePage'),
   this.flamelinkService.fetchNav('mainNavigation'),
   this.catalogApiService.request('loan_originators', query)
  ]
).subscribe(([result1, result2, result3]) => {
       // perform actions here
});

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