Parsnip objects not playing nicely with broom::glance

[beaulucas]

I've been transitioning my workflow into using tidymodels, but am noticing a lack of broom:: coverage.

Glance Doesn't Work, Tidy Does

# tidymodels_0.0.3
# broom_0.5.2
# parsnip_0.0.4
library(tidymodels)
set.seed(4831)
split <- initial_split(mtcars, props = 9/10)
car_train <- training(split)
car_test  <- testing(split)

car_model <- linear_reg()

lm_car_model <- 
  car_model %>%
  set_engine("lm")

lm_fit <-
  lm_car_model %>%
  fit(mpg ~ ., data = car_train)

# doesnt work, but classic lm does
broom::glance(lm_fit)
lm(mpg ~ ., data = car_train) %>% broom::glance()

# works
broom::tidy(lm_fit)

Is this something planning on being ironed out in the future? I've also noticed discrim supports no broom operations either.

Thanks for your feedback

[topepo]

We'll just need to write a glance.model_fit() function that runs glance() on x$fit.

Keep in mind, this will won't work if there are underlying broom methods for the model. For example, if parsnip wraps some model foo, the change above won't help if there is no tidy method for foo.

[alexpghayes]

broom doesn't really support ML models at all, so this will only help for lm and glm objects to the best of my knowledge.

[github-actions]

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