dot-df_to_list_of_lists: Convert a nested dataframe to a multilevel list

In rsurvstat: Download Infectious Disease Data from 'SurvStat' (Robert Koch Institute)

Convert a nested dataframe to a multilevel list

Description

Convert a nested dataframe to a multilevel list

Usage

.df_to_list_of_lists(df, ...)

Arguments

df	a nested dataframe
...	Named arguments passed on to .transpose x a data.frame or row_list .fix collapse or expand names in redundant multi-level row_lists. Either FALSE or a string to join or split the names of the multi-level list by ... not used

Value

a list of lists

Unit tests

iris_list = .df_to_list_of_lists(datasets::iris)
# TODO: iris_list has lost Petal.Length as it is interpreting Petal.Width as
# nested item and it overwrites Petal.Length rather than merging with it.

testthat::expect_equal(
  iris_list[[1]]$Species,
  iris$Species[[1]]
)

mtcars_nest = datasets::mtcars 
  dplyr::mutate(name = rownames(.)) 
  tidyr::nest(details = -c(cyl,gear))

mtcars_list = mtcars_nest 

mtcars_unnest = mtcars_list 

testthat::expect_equal(
  mtcars_list[[1]]$details[[1]]$name,
  mtcars_nest$details[[1]]$name[[1]]
)

rsurvstat documentation built on Feb. 20, 2026, 5:09 p.m.