Merge pull request #379 from cmu-delphi/retain-epi_df-class

Retain epi df class

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: epipredict
 Title: Basic epidemiology forecasting methods
-Version: 0.0.21
+Version: 0.0.22
 Authors@R: c(
     person("Daniel", "McDonald", , "[email protected]", role = c("aut", "cre")),
     person("Ryan", "Tibshirani", , "[email protected]", role = "aut"),

NEWS.md

@@ -57,3 +57,4 @@ Pre-1.0.0 numbering scheme: 0.x will indicate releases, while 0.0.x will indicat
 - Add `step_epi_slide` to produce generic sliding computations over an `epi_df`
 - Add quantile random forests (via `{grf}`) as a parsnip engine
 - Replace `epi_keys()` with `epiprocess::key_colnames()`, #352
+- Try to retain the `epi_df` class during baking to the extent possible, #376

R/epi_recipe.R

@@ -63,6 +63,7 @@ epi_recipe.default <- function(x, ...) {
 #' r
 epi_recipe.epi_df <-
   function(x, formula = NULL, ..., vars = NULL, roles = NULL) {
+    attr(x, "decay_to_tibble") <- FALSE
     if (!is.null(formula)) {
       if (!is.null(vars)) {
         rlang::abort(
@@ -160,6 +161,7 @@ epi_recipe.formula <- function(formula, data, ...) {
     return(recipes::recipe(formula, data, ...))
   }
 
+  attr(data, "decay_to_tibble") <- FALSE
   f_funcs <- recipes:::fun_calls(formula, data)
   if (any(f_funcs == "-")) {
     abort("`-` is not allowed in a recipe formula. Use `step_rm()` instead.")