I have a flow mapping like this:

var selectedGroup: MutableStateFlow<Group?> = MutableStateFlow(null)
...
private val _userInfosFlow = APIServer.getAllUserInfosAsFlow()
val userInfos: StateFlow<List<UserInfo>> =
    _userInfosFlow.map { userInfos ->
        selectedGroup.value?.let { group ->
            userInfos.filter { userInfo ->
                userInfo.groupId == group.getId()
            }
        } ?: emptyList()
    }

Where

_userInfosFlow

just gets a list of all UserInfo objects from database, and

userInfos

is a StateFlow that filters that list to only contain UserInfo's belonging to the current

selectedGroup

. Since I use

.map

, I believe the

userInfos

flow will emit only when

_userInfosFlow

emits. However, I also want

userInfos

to emit when

selectedGroup.value

changes, since that means that a new group is selected, and

userInfos

should logically update to now contain UserInfo's from the newly selected group. What is the best way to trigger this emission? Or is there just a better way to do this altogether

This is a #coroutines question. You can use `combine`:

combine(_userInfosFlow, selectedGroup) { userInfos, group ->
    ...
}