unnest_longer(): do not know how to convert 'value' to class “Date”

[selesnow]

Hi, i try unnesting date column by unnest_longer(), and get do not know how to convert 'value' to class “Date”, but its works when i useunnest()`

data example

# package
library(dplyr)
library(tidyr)
library(lubridate)

# test frame
df <- data.frame(
  transaction_id = c("1", "2"),
  trade_date = as.Date(c("2019-07-01", "2019-08-01")),
  start = as.Date(c("2019-08-01", "2019-12-01")),
  end = as.Date(c("2019-10-31", "2020-02-28")),
  price = c(5, 6),
  currency = c("CAD", "CAD"),
  volume = c(10000, 5000)
)

unnest_longer example

# unnest_longer
df %>%
  group_by(transaction_id) %>% 
  mutate(start=list(seq(start, end, "months"))) %>% 
  unnest_longer(col=start)

Result: ```r Error in as.Date.default(value) : do not know how to convert 'value' to class “Date” ``` ## unnest example ```r # unnest df %>% group_by(transaction_id) %>% mutate(start=list(seq(start, end, "months"))) %>% unnest(col=start) ``` Result: OK It`is normal behavior? sessionInfo() ``` R version 4.0.3 (2020-10-10) Platform: x86_64-w64-mingw32/x64 (64-bit) Running under: Windows 10 x64 (build 18363) Matrix products: default locale: [1] LC_COLLATE=Russian_Ukraine.1251 LC_CTYPE=Russian_Ukraine.1251 LC_MONETARY=Russian_Ukraine.1251 LC_NUMERIC=C [5] LC_TIME=Russian_Ukraine.1251 attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] lubridate_1.7.9 stringr_1.4.0 zoo_1.8-8 googlesheets4_0.2.0.9000 dplyr_1.0.2 [6] tidyr_1.1.2 loaded via a namespace (and not attached): [1] tidyselect_1.1.0 xfun_0.18 remotes_2.2.0 purrr_0.3.4 gargle_0.5.0.9000 lattice_0.20-41 vctrs_0.3.6 [8] generics_0.1.0 testthat_2.3.2 usethis_1.6.3 htmltools_0.5.0 yaml_2.2.1 utf8_1.1.4 rlang_0.4.9 [15] pkgbuild_1.1.0 pillar_1.4.7 glue_1.4.2 withr_2.3.0 sessioninfo_1.1.1 lifecycle_0.2.0 cellranger_1.1.0 [22] devtools_2.3.2 memoise_1.1.0 evaluate_0.14 knitr_1.30 callr_3.5.1 ps_1.4.0 curl_4.3 [29] fansi_0.4.1 Rcpp_1.0.5 openssl_1.4.3 backports_1.1.10 desc_1.2.0 pkgload_1.1.0 jsonlite_1.7.2 [36] fs_1.5.0 googleAuthR_1.3.0 askpass_1.1 digest_0.6.27 stringi_1.5.3 processx_3.4.4 rprojroot_1.3-2 [43] grid_4.0.3 cli_2.2.0 tools_4.0.3 magrittr_2.0.1 tibble_3.0.4 crayon_1.3.4 pkgconfig_2.0.3 [50] ellipsis_0.3.1 prettyunits_1.1.1 googledrive_1.0.1 assertthat_0.2.1 rmarkdown_2.4 httr_1.4.2 rstudioapi_0.11 [57] R6_2.5.0 compiler_4.0.3 ```

[hadley]

Somewhat more minimal reprex:

library(tidyr)

df <- tibble(start = as.list(as.Date(c("2019-08-01", "2019-12-01"))))
df %>% unnest_longer(start)
#> Error in as.Date.default(value): do not know how to convert 'value' to class "Date"

^{Created on 2021-02-17 by the reprex package (v1.0.0)}