closes #751

... and addresses #527

Author: edzer

NEWS.md

@@ -1,5 +1,7 @@
 # version 0.6-9
 
+* `slice.stars_proxy()` works (again) for single-file proxy objects; #751, #527
+
 * `[.stars()` with a `character` selector selects on names of a dimension if it has names; #747
 
 * handle "intervals" dimension in aggregate.stars() and `st_as_sf.stars()`; #745

R/tidyverse.R

@@ -161,7 +161,8 @@ slice.stars_proxy <- function(.data, along, index, ...) {
   # adrop.stars_proxy
 
   # If there are already operations queued, just add to the queue
-  if (!is.null(attr(.data, "call_list")))
+  if (!is.null(attr(.data, "call_list")) || 
+	  	(length(.data) == 1 && is.character(.data[[1]]))) # #527
     return(collect(.data, match.call(), "slice", ".data",
                    env = parent.frame(), ...))