refreshing already prepped recipe with step_dummy doesn't work

[TylerGrantSmith]

You are unable to re-prep a recipe that had a step_dummy step because the term_info field reflects the new dummy terms and the old nominal terms were removed.

When prep is called again on the step_dummy, the modified term_info is passed and col_names below ends up being NULL

recipes/R/dummy.R

Line 169 in 0137288

col_names <- terms_select(x$terms, info = info, empty_fun = passover)

suppressPackageStartupMessages(library(tidymodels))
#> Warning: package 'tidymodels' was built under R version 3.6.3
#> Warning: package 'broom' was built under R version 3.6.3
#> Warning: package 'ggplot2' was built under R version 3.6.3
#> Warning: package 'infer' was built under R version 3.6.3
#> Warning: package 'parsnip' was built under R version 3.6.3
#> Warning: package 'recipes' was built under R version 3.6.3
#> Warning: package 'tune' was built under R version 3.6.3
#> Warning: package 'workflows' was built under R version 3.6.3
#> Warning: package 'yardstick' was built under R version 3.6.3
test_data <- data.frame(x = factor(c(1,2)), y = c(1,2))

rec <- 
  recipe(y~., data = test_data) %>% 
  step_dummy(all_nominal(), one_hot = TRUE) %>% 
  prep()
rec
#> Data Recipe
#> 
#> Inputs:
#> 
#>       role #variables
#>    outcome          1
#>  predictor          1
#> 
#> Training data contained 2 data points and no missing data.
#> 
#> Operations:
#> 
#> Dummy variables from x [trained]
juice(rec)
#> # A tibble: 2 x 3
#>       y  x_X1  x_X2
#>   <dbl> <dbl> <dbl>
#> 1     1     1     0
#> 2     2     0     1

new_rec <- prep(rec, training = test_data, fresh = TRUE)
new_rec
#> Data Recipe
#> 
#> Inputs:
#> 
#>       role #variables
#>    outcome          1
#>  predictor          1
#> 
#> Training data contained 2 data points and no missing data.
#> 
#> Operations:
#> 
#> Dummy variables were *not* created since no columns were selected. [trained]
juice(new_rec)
#> # A tibble: 2 x 2
#>   x         y
#>   <fct> <dbl>
#> 1 1         1
#> 2 2         2
sessioninfo::session_info()
#> - Session info ---------------------------------------------------------------
#>  setting  value                       
#>  version  R version 3.6.2 (2019-12-12)
#>  os       Windows 10 x64              
#>  system   x86_64, mingw32             
#>  ui       RTerm                       
#>  language (EN)                        
#>  collate  English_United States.1252  
#>  ctype    English_United States.1252  
#>  tz       America/Chicago             
#>  date     2020-04-13                  
#> 
#> - Packages -------------------------------------------------------------------
#>  package       * version    date       lib source        
#>  assertthat      0.2.1      2019-03-21 [1] CRAN (R 3.6.2)
#>  backports       1.1.5      2019-10-02 [1] CRAN (R 3.6.1)
#>  base64enc       0.1-3      2015-07-28 [1] CRAN (R 3.6.0)
#>  bayesplot       1.7.1      2019-12-01 [1] CRAN (R 3.6.3)
#>  boot            1.3-23     2019-07-05 [1] CRAN (R 3.6.2)
#>  broom         * 0.5.5      2020-02-29 [1] CRAN (R 3.6.3)
#>  callr           3.4.0      2019-12-09 [1] CRAN (R 3.6.2)
#>  class           7.3-15     2019-01-01 [1] CRAN (R 3.6.2)
#>  cli             2.0.2      2020-02-28 [1] CRAN (R 3.6.3)
#>  codetools       0.2-16     2018-12-24 [1] CRAN (R 3.6.2)
#>  colorspace      1.4-1      2019-03-18 [1] CRAN (R 3.6.1)
#>  colourpicker    1.0        2017-09-27 [1] CRAN (R 3.6.2)
#>  crayon          1.3.4      2017-09-16 [1] CRAN (R 3.6.2)
#>  crosstalk       1.0.0      2016-12-21 [1] CRAN (R 3.6.2)
#>  dials         * 0.0.5      2020-04-01 [1] CRAN (R 3.6.2)
#>  DiceDesign      1.8-1      2019-07-31 [1] CRAN (R 3.6.3)
#>  digest          0.6.25     2020-02-23 [1] CRAN (R 3.6.2)
#>  dplyr         * 0.8.3      2019-07-04 [1] CRAN (R 3.6.2)
#>  DT              0.11       2019-12-19 [1] CRAN (R 3.6.2)
#>  dygraphs        1.1.1.6    2018-07-11 [1] CRAN (R 3.6.3)
#>  evaluate        0.14       2019-05-28 [1] CRAN (R 3.6.2)
#>  fansi           0.4.1      2020-01-08 [1] CRAN (R 3.6.2)
#>  fastmap         1.0.1      2019-10-08 [1] CRAN (R 3.6.2)
#>  foreach         1.4.7      2019-07-27 [1] CRAN (R 3.6.2)
#>  furrr           0.1.0      2018-05-16 [1] CRAN (R 3.6.3)
#>  future          1.15.1     2019-11-25 [1] CRAN (R 3.6.2)
#>  generics        0.0.2      2018-11-29 [1] CRAN (R 3.6.2)
#>  ggplot2       * 3.3.0      2020-03-05 [1] CRAN (R 3.6.3)
#>  ggridges        0.5.2      2020-01-12 [1] CRAN (R 3.6.2)
#>  globals         0.12.5     2019-12-07 [1] CRAN (R 3.6.1)
#>  glue            1.3.1      2019-03-12 [1] CRAN (R 3.6.2)
#>  gower           0.2.1      2019-05-14 [1] CRAN (R 3.6.1)
#>  GPfit           1.0-8      2019-02-08 [1] CRAN (R 3.6.3)
#>  gridExtra       2.3        2017-09-09 [1] CRAN (R 3.6.2)
#>  gtable          0.3.0      2019-03-25 [1] CRAN (R 3.6.2)
#>  gtools          3.8.2      2020-03-31 [1] CRAN (R 3.6.2)
#>  highr           0.8        2019-03-20 [1] CRAN (R 3.6.2)
#>  htmltools       0.4.0      2019-10-04 [1] CRAN (R 3.6.2)
#>  htmlwidgets     1.5.1      2019-10-08 [1] CRAN (R 3.6.2)
#>  httpuv          1.5.2      2019-09-11 [1] CRAN (R 3.6.2)
#>  igraph          1.2.4.2    2019-11-27 [1] CRAN (R 3.6.2)
#>  infer         * 0.5.1      2019-11-19 [1] CRAN (R 3.6.3)
#>  inline          0.3.15     2018-05-18 [1] CRAN (R 3.6.3)
#>  ipred           0.9-9      2019-04-28 [1] CRAN (R 3.6.2)
#>  iterators       1.0.12     2019-07-26 [1] CRAN (R 3.6.2)
#>  janeaustenr     0.1.5      2017-06-10 [1] CRAN (R 3.6.2)
#>  knitr           1.26       2019-11-12 [1] CRAN (R 3.6.2)
#>  later           1.0.0      2019-10-04 [1] CRAN (R 3.6.2)
#>  lattice         0.20-38    2018-11-04 [1] CRAN (R 3.6.2)
#>  lava            1.6.6      2019-08-01 [1] CRAN (R 3.6.2)
#>  lhs             1.0.1      2019-02-03 [1] CRAN (R 3.6.3)
#>  lifecycle       0.1.0      2019-08-01 [1] CRAN (R 3.6.2)
#>  listenv         0.8.0      2019-12-05 [1] CRAN (R 3.6.2)
#>  lme4            1.1-21     2019-03-05 [1] CRAN (R 3.6.3)
#>  loo             2.2.0      2019-12-19 [1] CRAN (R 3.6.3)
#>  lubridate       1.7.4      2018-04-11 [1] CRAN (R 3.6.2)
#>  magrittr        1.5        2014-11-22 [1] CRAN (R 3.6.2)
#>  markdown        1.1        2019-08-07 [1] CRAN (R 3.6.2)
#>  MASS            7.3-51.4   2019-03-31 [1] CRAN (R 3.6.2)
#>  Matrix          1.2-18     2019-11-27 [1] CRAN (R 3.6.2)
#>  matrixStats     0.56.0     2020-03-13 [1] CRAN (R 3.6.3)
#>  mime            0.9        2020-02-04 [1] CRAN (R 3.6.2)
#>  miniUI          0.1.1.1    2018-05-18 [1] CRAN (R 3.6.2)
#>  minqa           1.2.4      2014-10-09 [1] CRAN (R 3.6.3)
#>  munsell         0.5.0      2018-06-12 [1] CRAN (R 3.6.2)
#>  nlme            3.1-142    2019-11-07 [1] CRAN (R 3.6.2)
#>  nloptr          1.2.2.1    2020-03-11 [1] CRAN (R 3.6.3)
#>  nnet            7.3-12     2016-02-02 [1] CRAN (R 3.6.2)
#>  parsnip       * 0.0.5      2020-01-07 [1] CRAN (R 3.6.3)
#>  pillar          1.4.3      2019-12-20 [1] CRAN (R 3.6.2)
#>  pkgbuild        1.0.6      2019-10-09 [1] CRAN (R 3.6.2)
#>  pkgconfig       2.0.3      2019-09-22 [1] CRAN (R 3.6.2)
#>  plyr            1.8.5      2019-12-10 [1] CRAN (R 3.6.2)
#>  prettyunits     1.0.2      2015-07-13 [1] CRAN (R 3.6.2)
#>  pROC            1.16.0     2020-01-12 [1] CRAN (R 3.6.2)
#>  processx        3.4.1      2019-07-18 [1] CRAN (R 3.6.2)
#>  prodlim         2019.11.13 2019-11-17 [1] CRAN (R 3.6.2)
#>  promises        1.1.0      2019-10-04 [1] CRAN (R 3.6.2)
#>  ps              1.3.0      2018-12-21 [1] CRAN (R 3.6.2)
#>  purrr         * 0.3.3      2019-10-18 [1] CRAN (R 3.6.2)
#>  R6              2.4.1      2019-11-12 [1] CRAN (R 3.6.2)
#>  Rcpp            1.0.3      2019-11-08 [1] CRAN (R 3.6.2)
#>  recipes       * 0.1.10     2020-03-18 [1] CRAN (R 3.6.3)
#>  reshape2        1.4.3      2017-12-11 [1] CRAN (R 3.6.2)
#>  rlang           0.4.4      2020-01-28 [1] CRAN (R 3.6.2)
#>  rmarkdown       2.0        2019-12-12 [1] CRAN (R 3.6.2)
#>  rpart           4.1-15     2019-04-12 [1] CRAN (R 3.6.2)
#>  rsample       * 0.0.6      2020-03-31 [1] CRAN (R 3.6.2)
#>  rsconnect       0.8.16     2019-12-13 [1] CRAN (R 3.6.2)
#>  rstan           2.19.3     2020-02-11 [1] CRAN (R 3.6.3)
#>  rstanarm        2.19.3     2020-02-11 [1] CRAN (R 3.6.3)
#>  rstantools      2.0.0      2019-09-15 [1] CRAN (R 3.6.3)
#>  rstudioapi      0.11       2020-02-07 [1] CRAN (R 3.6.2)
#>  scales        * 1.1.0      2019-11-18 [1] CRAN (R 3.6.2)
#>  sessioninfo     1.1.1      2018-11-05 [1] CRAN (R 3.6.2)
#>  shiny           1.4.0      2019-10-10 [1] CRAN (R 3.6.2)
#>  shinyjs         1.1        2020-01-13 [1] CRAN (R 3.6.2)
#>  shinystan       2.5.0      2018-05-01 [1] CRAN (R 3.6.3)
#>  shinythemes     1.1.2      2018-11-06 [1] CRAN (R 3.6.3)
#>  SnowballC       0.6.0      2019-01-15 [1] CRAN (R 3.6.0)
#>  StanHeaders     2.21.0-1   2020-01-19 [1] CRAN (R 3.6.2)
#>  stringi         1.4.6      2020-02-17 [1] CRAN (R 3.6.2)
#>  stringr         1.4.0      2019-02-10 [1] CRAN (R 3.6.2)
#>  survival        3.1-8      2019-12-03 [1] CRAN (R 3.6.2)
#>  threejs         0.3.3      2020-01-21 [1] CRAN (R 3.6.3)
#>  tibble        * 2.1.3      2019-06-06 [1] CRAN (R 3.6.2)
#>  tidymodels    * 0.1.0      2020-02-16 [1] CRAN (R 3.6.3)
#>  tidyposterior   0.0.2      2018-11-15 [1] CRAN (R 3.6.3)
#>  tidypredict     0.4.5      2020-02-10 [1] CRAN (R 3.6.3)
#>  tidyr           1.0.0      2019-09-11 [1] CRAN (R 3.6.2)
#>  tidyselect      1.0.0      2020-01-27 [1] CRAN (R 3.6.3)
#>  tidytext        0.2.2      2019-07-29 [1] CRAN (R 3.6.2)
#>  timeDate        3043.102   2018-02-21 [1] CRAN (R 3.6.0)
#>  tokenizers      0.2.1      2018-03-29 [1] CRAN (R 3.6.2)
#>  tune          * 0.0.1      2020-02-11 [1] CRAN (R 3.6.3)
#>  utf8            1.1.4      2018-05-24 [1] CRAN (R 3.6.2)
#>  vctrs           0.2.3      2020-02-20 [1] CRAN (R 3.6.3)
#>  withr           2.1.2      2018-03-15 [1] CRAN (R 3.6.2)
#>  workflows     * 0.1.1      2020-03-17 [1] CRAN (R 3.6.3)
#>  xfun            0.11       2019-11-12 [1] CRAN (R 3.6.2)
#>  xtable          1.8-4      2019-04-21 [1] CRAN (R 3.6.2)
#>  xts             0.12-0     2020-01-19 [1] CRAN (R 3.6.2)
#>  yaml            2.2.1      2020-02-01 [1] CRAN (R 3.6.2)
#>  yardstick     * 0.0.6      2020-03-17 [1] CRAN (R 3.6.3)
#>  zoo             1.8-7      2020-01-10 [1] CRAN (R 3.6.2)

[github-actions]

This issue has been automatically locked. If you believe you have found a related problem, please file a new issue (with a reprex https://reprex.tidyverse.org) and link to this issue.