TypeError: You provided an invalid object where a stream was expected. You can provide an Observable, Promise, Array, or Iterable

Question

I am trying to map from a service call but getting an error. Looked at subscribe is not defined in angular 2? and it said that in order to subscribe we need to

Answer 1

A hint for anyone experiencing this. This can happen when a switchMap doesn't receive an observable return value (like null). Simply add a default case, so it always returns an observable.

        switchMap((dateRange) => {
          if (dateRange === 'Last 24 hours') {
            return $observable1;
          }
          if (dateRange === 'Last 7 Days') {
            return $observable2;
          }
          if (dateRange === 'Last 30 Days') {
            return $observable3;
          }
          // This line will work for default cases
          return $observableElse;
        })