Fix. Add special treatment of dimensions attrbute to account for the data_array propery of the "values" attribute. Closes plotly#2385.

* Add tests to check that "values" property has class "AsIs" for "parcoords", "parcats" and "splom" traces.

* Add NEWS entry

Author: trekonom

NEWS.md

@@ -12,6 +12,8 @@
 
 * Closed #2337: Creating a new `event_data()` handler no longer causes a spurious reactive update of existing `event_data()`s. (#2339)
 
+* Closed #2385: `"parcoords"`, `"parcats"` and `"splom"` traces now work with one-dimensional data by accounting for the "data_array" property of the "values" attribute of "dimensions".
+
 # 4.10.4
 
 ## Improvements

R/utils.R

@@ -551,7 +551,15 @@ verify_attr <- function(proposed, schema, layoutAttr = FALSE) {
 
     # do the same for "sub-attributes"
     if (identical(role, "object") && is.recursive(proposed[[attr]])) {
-      proposed[[attr]] <- verify_attr(proposed[[attr]], attrSchema, layoutAttr = layoutAttr)
+      # The "dimensions" attribute requires a special treatment as 
+      # it is an unnamed list and hence will be skipped by `for (attr in names(proposed))
+      if (attr == "dimensions") {
+        proposed[[attr]] <- lapply(proposed[[attr]], \(x) {
+          verify_attr(x, attrSchema$items$dimension, layoutAttr = layoutAttr)
+        })  
+      } else {
+        proposed[[attr]] <- verify_attr(proposed[[attr]], attrSchema, layoutAttr = layoutAttr)  
+      }
     }
   }
 

tests/testthat/test-plotly-parcats.R

@@ -0,0 +1,20 @@
+expect_traces <- function(p, n.traces, name) {
+  stopifnot(is.numeric(n.traces))
+  L <- expect_doppelganger_built(p, paste0("plotly-", name))
+  expect_equivalent(length(L$data), n.traces)
+  L
+}
+
+test_that("values property has a class of AsIs", {
+  p <- plot_ly(
+    dimensions = list(
+      list(values = "A"),
+      list(values = "B")
+    ),
+    type = "parcats"
+  )
+  l <- expect_traces(p, 1, "parcats-data-array")
+  tr <- l$data[[1]]$dimensions
+  expect_true(inherits(tr[[1]]$values, "AsIs"))
+  expect_true(inherits(tr[[2]]$values, "AsIs"))
+})

tests/testthat/test-plotly-parcoords.R

@@ -0,0 +1,20 @@
+expect_traces <- function(p, n.traces, name) {
+  stopifnot(is.numeric(n.traces))
+  L <- expect_doppelganger_built(p, paste0("plotly-", name))
+  expect_equivalent(length(L$data), n.traces)
+  L
+}
+
+test_that("values property has a class of AsIs", {
+  p <- plot_ly(
+    dimensions = list(
+      list(label = "A", values = 3),
+      list(label = "B", values = 8)
+    ),
+    type = "parcoords"
+  )
+  l <- expect_traces(p, 1, "parcoords-data-array")
+  tr <- l$data[[1]]$dimensions
+  expect_true(inherits(tr[[1]]$values, "AsIs"))
+  expect_true(inherits(tr[[2]]$values, "AsIs"))
+})

tests/testthat/test-plotly-splom.R

@@ -1,5 +1,9 @@
-
-
+expect_traces <- function(p, n.traces, name) {
+  stopifnot(is.numeric(n.traces))
+  L <- expect_doppelganger_built(p, paste0("plotly-", name))
+  expect_equivalent(length(L$data), n.traces)
+  L
+}
 
 test_that("No cartesian axes are supplied to a splom chart", {
 
@@ -12,3 +16,17 @@ test_that("No cartesian axes are supplied to a splom chart", {
   )
 
 })
+
+test_that("values property has a class of AsIs", {
+  p <- plot_ly(
+    type = "splom",
+    dimensions = list(
+      list(values = 1, label = "A"),
+      list(values = 2, label = "B")
+    )
+  )
+  l <- expect_traces(p, 1, "parcats-data-array")
+  tr <- l$data[[1]]$dimensions
+  expect_true(inherits(tr[[1]]$values, "AsIs"))
+  expect_true(inherits(tr[[2]]$values, "AsIs"))
+})