If works as expected if I use

flatMap

instead of

withLatestFrom

, but curious why

withLatestFrom

doesn't. I thought it will get the current value at the point of time I activate the subject.

The reason

flatMap

works is because

flatMap

will resubscribe every time the upstream observable emits. And since

dealerAction

is a

Single

, it will only compute the value on subscription. So with

flatMap

, every time you click, you’re re-subscribing to

dealerAction

, which re-reads the preference, and you get your new value. With

withLatestFrom

,

dealerAction

is only subscribed to once, and since it’s a

Single

it will only emit once.

wow, that's a pretty great explanation 🙂