Angularfire: subscribe is not working in the second time

[SonuSahoo]

Hi i am using firestore through angularfire2 i want to call a collection once the app loaded and want to store in a observable variable and want to use through out the app below is my code.

in constructor

 fleets: Observable<Fleet[]>;
this.fleets =this.afs.collection('Fleets').snapshotChanges().pipe(map(
      changes => {
        return changes.map(
          a => {
            const data = a.payload.doc.data() as Fleet;
            data.id = a.payload.doc.id;
            return data;
          });
      }));

getflleet()
{
return this.fleets;
}

in more than one component

this.firebaseService.getflleet()
     .subscribe(
       (fleet) => {
         this.arr = fleet;
         console.log(this.arr);
       }
     );
   }

but the problem is only once a time its calling in the first component.
Thanks in andvance

[kbala]

Yes, it doesn't trigger for second time changes. Any help please....

[futuredayv]

I started to learn about RxJS recently and I don't think it is an appropriate way to use Subjects like this but I am using Subjects on services to hold and serve data. Not the best but surely works for me. It works when you revisit component because BehaviorSubject always have recently passed value.

[alberthoekstra]

Indeed, a BehaviorSubject is what you wanna use.

[dalepo]

I suggest using the shareReplay operator in this case.

[jamesdaniels]

RXJS things. Working as intended. Closing.