Handling NAs when Converting List to Tibble

I have a list of this format:
region_parent_1 character[1]
region_parent_2 character[3]
region_parent_3 character[1]
region_parent_4 character[0]
where each region_parent is a character vector of vary length contain various regions.

And I want to create a tibble that looks like this
region_parent, region
region_parent_1, region_a
region_parent_2, region_b
region_parent_2, region_c
region_parent_2, region_d
region_parent_3, region_e
region_parent_4, region_parent_4

Notice that when the character vector is empty I want region_parent that is the name of that character vector in the list to sub in for the missing region element.

I have mostly figured out coerce the list into the tibble I want by using the following:

lambda = function(array, region_parent) {
  df = array %>% 
    as.data.frame() %>% 
    setNames("region") %>% 
    mutate(region_parent = region_parent)

region_list = map2(region_list, names(region_list), lambda)
region_list  = rbindlist(region_list, use.names = TRUE)

However it drops any element in the list where the character vector has zero regions/elements in it.

I was close to a fix by modifying the lambda function like this but it turns the tibble into an array again and fails to correctly set names and add the region_parent column.

lambda = function(array, region_parent) {
  df = array %>% 
    as.data.frame() %>% 
    {if (nrow(.) == 0) rbind(region_parent) else .} %>%
    setNames("region") %>% 
    mutate(region_parent = region_parent)

Any ideas how to prevent these empty vectors from being dropped or a simpler way to collapse this list into a tibble would be welcome.

(d1<- list(
  region_parent_1= "a",
  region_parent_2= letters[1:3],

enframe(d1) |> 
  unnest_longer(col=value,keep_empty = TRUE) |>

This was a simpler way to convert between a list and a tibble, so thanks.

But unfortunately keep_empty = TRUE failed to keep my missing regions. It just gave me the error Error in unnest_longer(., col = value, keep_empty = TRUE) : unused argument (keep_empty = TRUE)

The latest version of tidyr is 1.3 i think. Try upgrading to that.

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