ffs with recipe

[joshualerickson]

When I try to use a recipe with ffs it doesn't recognize the "response" from the recipe object. Is there a work around for this? Thanks.

``
rec_test <-
recipe(stream ~ ., data = testing) %>%
update_role(sb12, new_role = "performance var") %>%
step_center(all_predictors()) %>%
step_scale(all_predictors()) %>%
step_pca(contains("_30agg"), prefix = "pca_B", threshold = 0.9)

sb12 <- CreateSpacetimeFolds(train,spacevar = "sb12",k = 10, seed = 123 )
ctrltest <- trainControl(method="repeatedcv",
repeats = 5,
allowParallel = TRUE,
returnResamp = "all",
verbose = FALSE,
index = sb12$index)

set.seed(1234)
ffstest <- ffs(rec_test,
data = testing,
metric = "Kappa",
method = "rf",
trControl = ctrltest)

Error in ffs(rec_test, data = testing, metric = "Kappa", method = "rf", :
argument "response" is missing, with no default