Error when using initial_time_split with drake - tidymodels

Question

Learning how to use drake with tidymodels.
Something about using rsample's initial_time_split(), rather than just initial_split(), is giving me an error, when I run make(plan). I get the following:
#> > target data
#> > target split_data
#> Error in UseMethod("complement"): no applicable method for 'complement' applied to an object of class "rsplit"
Have really been racking my brain on this one. The function works fine, independently (ie. the following works):
I feel like I am missing something pretty basic.
Here is the full drake process in a single file (so that it is easier to post up on stack overflow).
Thanks in advance for the hints, as to what I'm doing wrong.
library(drake)
library(tidyverse)
library(tidymodels)
###################################################################
generate_data <- function() {
tibble(x = rnorm(1e5), y = rnorm(1e5))
}
split_the_data <- function(data) {
data %>%
initial_time_split()
}
fit_model <- function(data) {
summary(lm(y ~ x, data = data))
}
###################################################################
plan <- drake_plan(
data = generate_data(),
split_data = split_the_data(data),
model = fit_model(training(split_data))
)
###################################################################
make(plan)

Answer 1

This should now be fixed in the current development version (as of 93d60ef41119defc0432cc95d2dd6787e4a00b14). You can install it with
install.packages("remotes")
remotes::install_github("ropensci/drake")
The error happened because drake calls NROW() on every target (for dynamic branching purposes) and apparently NROW() errors on rsplit objects.
library(tidyverse)
library(tidymodels)
#> ── Attaching packages ─────────────────────────────────────── tidymodels 0.1.1 ──
#> ✓ broom 0.7.0 ✓ recipes 0.1.13
#> ✓ dials 0.0.8 ✓ rsample 0.0.7
#> ✓ infer 0.5.3 ✓ tune 0.1.1
#> ✓ modeldata 0.0.2 ✓ workflows 0.1.2
#> ✓ parsnip 0.1.2 ✓ yardstick 0.0.7
#> ── Conflicts ────────────────────────────────────────── tidymodels_conflicts() ──
#> x scales::discard() masks purrr::discard()
#> x dplyr::filter() masks stats::filter()
#> x recipes::fixed() masks stringr::fixed()
#> x dplyr::lag() masks stats::lag()
#> x yardstick::spec() masks readr::spec()
#> x recipes::step() masks stats::step()
generate_data <- function() {
tibble(x = rnorm(1e5), y = rnorm(1e5))
}
split_the_data <- function(data) {
data %>%
initial_time_split()
}
NROW(split_the_data(generate_data()))
#> Error in UseMethod("complement"): no applicable method for 'complement' applied to an object of class "rsplit"
Created on 2020-07-23 by the reprex package (v0.3.0)
Issue tracked in https://github.com/ropensci/drake/issues/1300.