Specify which step produces error

[EmilHvitfeldt]

Not all steps report which step they are produced inside. It can lead to slowness when debugging. This is a more general issue that contains #394.

library(recipes)

recipe(~ ., data = iris) %>%
  step_dummy(Sepal.Length) %>%
  step_center(all_predictors()) %>%
  step_scale(all_predictors()) %>%
  prep()
#> Warning: The following variables are not factor vectors and will be ignored:
#> `Sepal.Length`
#> Error: The `terms` argument in `step_dummy` did not select any factor columns.

recipe(~ ., data = iris) %>%
  step_discretize(Species) %>%
  step_center(all_predictors()) %>%
  step_scale(all_predictors()) %>%
  prep()
#> Error: All columns selected for the step should be numeric

^{Created on 2019-12-01 by the reprex package (v0.3.0)}

[gacolitti]

Additionally, it would be nice if the error returned the name of the non-numeric column that triggered the error.

[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.