Fix inplace renaming of columns

NEWS.md

@@ -6,6 +6,7 @@ Minor spelling / mathematical updates to Scoring rule vignette. (#969)
 
 - A bug was fixed where `crps_sample()` could fail in edge cases.
 - Implemented a new forecast class, `forecast_ordinal` with appropriate metrics. Ordinal forecasts are a form of categorical forecasts. The main difference between ordinal and nominal forecasts is that the outcome is ordered, rather than unordered.
+- Refactored the way that columns get internally renamed in `as_forecast_<type>()` functions (#980)
 
 # scoringutils 2.0.0
 

R/class-forecast-binary.R

@@ -34,7 +34,12 @@ as_forecast_binary <- function(data,
                                forecast_unit = NULL,
                                observed = NULL,
                                predicted = NULL) {
-  data <- as_forecast_generic(data, forecast_unit, observed, predicted)
+  data <- as_forecast_generic(
+    data,
+    forecast_unit,
+    observed = observed,
+    predicted = predicted
+  )
   data <- new_forecast(data, "forecast_binary")
   assert_forecast(data)
   return(data)

R/class-forecast-nominal.R

@@ -45,13 +45,13 @@ as_forecast_nominal <- function(data,
                                 observed = NULL,
                                 predicted = NULL,
                                 predicted_label = NULL) {
-  assert_character(predicted_label, len = 1, null.ok = TRUE)
-  assert_subset(predicted_label, names(data), empty.ok = TRUE)
-  if (!is.null(predicted_label)) {
-    setnames(data, old = predicted_label, new = "predicted_label")
-  }
-
-  data <- as_forecast_generic(data, forecast_unit, observed, predicted)
+  data <- as_forecast_generic(
+    data,
+    forecast_unit,
+    observed = observed,
+    predicted = predicted,
+    predicted_label = predicted_label
+  )
   data <- new_forecast(data, "forecast_nominal")
   assert_forecast(data)
   return(data)

R/class-forecast-ordinal.R

@@ -45,13 +45,13 @@ as_forecast_ordinal <- function(data,
                                 observed = NULL,
                                 predicted = NULL,
                                 predicted_label = NULL) {
-  assert_character(predicted_label, len = 1, null.ok = TRUE)
-  assert_subset(predicted_label, names(data), empty.ok = TRUE)
-  if (!is.null(predicted_label)) {
-    setnames(data, old = predicted_label, new = "predicted_label")
-  }
-
-  data <- as_forecast_generic(data, forecast_unit, observed, predicted)
+  data <- as_forecast_generic(
+    data,
+    forecast_unit,
+    observed = observed,
+    predicted = predicted,
+    predicted_label = predicted_label
+  )
   data <- new_forecast(data, "forecast_ordinal")
   assert_forecast(data)
   return(data)

R/class-forecast-point.R

@@ -30,7 +30,12 @@ as_forecast_point.default <- function(data,
                                       observed = NULL,
                                       predicted = NULL,
                                       ...) {
-  data <- as_forecast_generic(data, forecast_unit, observed, predicted)
+  data <- as_forecast_generic(
+    data,
+    forecast_unit,
+    observed = observed,
+    predicted = predicted
+  )
   data <- new_forecast(data, "forecast_point")
   assert_forecast(data)
   return(data)

R/class-forecast-quantile.R

@@ -46,13 +46,13 @@ as_forecast_quantile.default <- function(data,
                                          predicted = NULL,
                                          quantile_level = NULL,
                                          ...) {
-  assert_character(quantile_level, len = 1, null.ok = TRUE)
-  assert_subset(quantile_level, names(data), empty.ok = TRUE)
-  if (!is.null(quantile_level)) {
-    setnames(data, old = quantile_level, new = "quantile_level")
-  }
-
-  data <- as_forecast_generic(data, forecast_unit, observed, predicted)
+  data <- as_forecast_generic(
+    data,
+    forecast_unit,
+    observed = observed,
+    predicted = predicted,
+    quantile_level = quantile_level
+  )
   data <- new_forecast(data, "forecast_quantile")
   assert_forecast(data)
   return(data)

R/class-forecast-sample.R

@@ -29,13 +29,13 @@ as_forecast_sample <- function(data,
                                observed = NULL,
                                predicted = NULL,
                                sample_id = NULL) {
-  assert_character(sample_id, len = 1, null.ok = TRUE)
-  assert_subset(sample_id, names(data), empty.ok = TRUE)
-  if (!is.null(sample_id)) {
-    setnames(data, old = sample_id, new = "sample_id")
-  }
-
-  data <- as_forecast_generic(data, forecast_unit, observed, predicted)
+  data <- as_forecast_generic(
+    data,
+    forecast_unit,
+    observed = observed,
+    predicted = predicted,
+    sample_id = sample_id
+  )
   data <- new_forecast(data, "forecast_sample")
   assert_forecast(data)
   return(data)

R/class-forecast.R

@@ -4,25 +4,29 @@
 #' It renames the required columns, where appropriate, and sets the forecast
 #' unit.
 #' @inheritParams as_forecast_doc_template
+#' @param ... Named arguments that are used to rename columns. The names of the
+#'  arguments are the names of the columns that should be renamed. The values
+#'  are the new names.
 #' @keywords as_forecast
 as_forecast_generic <- function(data,
                                 forecast_unit = NULL,
-                                observed = NULL,
-                                predicted = NULL) {
-  # check inputs - general
+                                ...) {
   data <- ensure_data.table(data)
-  assert_character(observed, len = 1, null.ok = TRUE)
-  assert_subset(observed, names(data), empty.ok = TRUE)
-
-  assert_character(predicted, len = 1, null.ok = TRUE)
-  assert_subset(predicted, names(data), empty.ok = TRUE)
-
-  # rename columns - general
-  if (!is.null(observed)) {
-    setnames(data, old = observed, new = "observed")
-  }
-  if (!is.null(predicted)) {
-    setnames(data, old = predicted, new = "predicted")
+  oldnames <- list(...)
+  newnames <- names(oldnames)
+  provided <- !sapply(oldnames, is.null)
+
+  lapply(seq_along(oldnames), function(i) {
+    var <- oldnames[[i]]
+    varname <- names(oldnames)[i]
+    assert_character(var, len = 1, null.ok = TRUE, .var.name = varname)
+    assert_subset(var, names(data), empty.ok = TRUE, .var.name = varname)
+  })
+
+  oldnames <- unlist(oldnames[provided])
+  newnames <- unlist(newnames[provided])
+  if (!is.null(oldnames) && length(oldnames) > 0) {
+    setnames(data, old = oldnames, new = newnames)
   }
 
   # set forecast unit (error handling is done in `set_forecast_unit()`)

scoringutils.Rproj

@@ -1,4 +1,5 @@
 Version: 1.0
+ProjectId: 008f911e-df6e-4218-825c-db1095ac43c4
 
 RestoreWorkspace: No
 SaveWorkspace: No

tests/testthat/test-class-forecast-quantile.R

@@ -157,6 +157,25 @@ test_that("as_forecast_quantiles issue 557 fix", {
   expect_equal(any(is.na(out$interval_coverage_deviation)), FALSE)
 })
 
+test_that("as_forecast_quantile doesn't modify column names in place", {
+  quantile_data <- data.table(
+    my_quantile = c(0.25, 0.5),
+    forecast_value = c(1, 2),
+    observed_value = c(5, 5)
+  )
+  pre <- names(quantile_data)
+
+  quantile_forecast <- quantile_data %>%
+    as_forecast_quantile(
+      predicted = "forecast_value",
+      observed = "observed_value",
+      quantile_level = "my_quantile"
+    )
+
+  post <- names(quantile_data)
+  expect_equal(pre, post)
+})
+
 
 # ==============================================================================
 # is_forecast_quantile()