I'm new in rxjs and after readed tons of articles I feel a bit confused.
I have a lot of nested http requests,that fetch data from the API.
First request gets the list of my devices, every device contains a list of sensors, every sensor contains a list of temperatures.
The first API request returns the devices list with sensors array filled, but the temperatures array are empty. At this point I must do one http request for each sensors to fetch temperatures data.

I tried to use switchmap combined with forkJoin, but in the observable subscription I obtain only the arrays of temperatures.
How can I fill temperatures arrays of each sensor?

```js
APIconnector.GetDevices()
    .pipe(
      tap(devices => {console.log(devices)}),
      switchMap(devices => forkJoin(devices.map(device => device.Sensors))),
      tap(sensors => {console.log(sensors)}),
      switchMap(sensors => forkJoin(sensors.map(sensor => {
        const param = {
          MinutesInterval: 30,
          StartDate: stDate,
          EndDate: new Date(),
          SensorIds: [sensor.Id]
        };  
        return APIconnector.GetIntervalRange(param);
      })))
    ).subscribe(data => {      
      console.log(data);
    })

```

I need all the data returned by the API, not only the last one.

**-- UPDATE --**

I hope this stackblitz sketch can help you.

<https://stackblitz.com/edit/angular-txtemn>