Angular 2 Auth Gaurd using ngrx store select. Do i unsubscribe?

Question

I use the async pipe in my templates for all store select values as it does all the clean up, including unsubscribing, on its own.

But when i manually subscribe to a value in my auth gaurd, would i need to unsubscribe this? If yes, then what would be the best way to do that?

@Injectable()
export class AuthGaurd implements CanActivate{

constructor(
    private store: Store<fromRoot.State>,
    private router: Router
){}

canActivate(){
    this.store.select(getLoggedInState).subscribe(res => {
        if(res){
            return true
        }else {
            this.router.navigate(['/login']);
        }
    });
        return false;
    }
}

Answer 1

You should use take to get just the first value:

canActivate(){
    this.store.select(getLoggedInState).take(1).subscribe(res => {
        if(res){
            return true
        }else {
           c this.router.navigate(['/login']);
        }
    });
        return false;
    }
}

take(n) makes the observable take the first n values it receives and then complete. You would not need to unsubscribe in this case.