Formula notation in plug_formula

[cimentadaj]

Trying to adapt plug_formula to accept notation such as multilevel groupings of survival notation. Starting out with multilevel but can't fit it:

library(tidyflow)
library(multilevelmod)
#> Loading required package: parsnip
data(sleepstudy, package = "lme4")
mixed_model_spec <- linear_reg() %>% set_engine("lmer")
tflow <-
  sleepstudy %>%
  tidyflow() %>%
  plug_formula(Reaction ~ Days + (Days | Subject)) %>%
  plug_model(mixed_model_spec)

res <- fit(tflow)
#> Warning in Ops.factor(Days, Subject): '|' not meaningful for factors
#> Error in if (remove_intercept) {: argument is of length zero

This is related to hardhat::mold not handling well multilevel notation. See issue tidymodels/hardhat#147

Next step would be to try models with cbind and Surv.