From f7894e55f3fed4c282df2a2db72c98a4e47bb3e0 Mon Sep 17 00:00:00 2001
From: m7pr <marcin.kosinski.mk1@roche.com>
Date: Tue, 29 Oct 2024 10:21:12 +0100
Subject: [PATCH] add a warning

---
 R/teal_data-extract.R | 1 +
 1 file changed, 1 insertion(+)

diff --git a/R/teal_data-extract.R b/R/teal_data-extract.R
index 64d569bce..0df590254 100644
--- a/R/teal_data-extract.R
+++ b/R/teal_data-extract.R
@@ -27,6 +27,7 @@
   checkmate::assert_class(names, "character")
   names_in_env <- intersect(names, ls(get_env(x)))
   if (!length(names_in_env)) {
+    warning("None of `names` elements exist in `teal_data`. Returning empty `teal_data`.")
     return(teal_data())
   }
   # From ?NextMethod