From 127d4abd62aa3d0937e06ca031a7d230f1a98662 Mon Sep 17 00:00:00 2001
From: vherr2 <vherr2@illinois.edu>
Date: Sat, 9 May 2020 16:30:21 -0700
Subject: [PATCH] Fixes guard for maps

---
 lib/ash/filter/filter.ex | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/ash/filter/filter.ex b/lib/ash/filter/filter.ex
index 42c70db8..9d2be459 100644
--- a/lib/ash/filter/filter.ex
+++ b/lib/ash/filter/filter.ex
@@ -857,7 +857,8 @@ defimpl Inspect, for: Ash.Filter do
   import Inspect.Algebra
   import Ash.Filter.InspectHelpers
 
-  defguardp is_empty(val) when is_nil(val) or length(val) == 0
+  defguardp is_empty(val)
+            when is_nil(val) or (is_map(val) and map_size(val) == 0) or length(val) == 0
 
   def inspect(%Ash.Filter{not: not_filter} = filter, opts) when not is_nil(not_filter) do
     impossible = if Map.fetch!(filter, :impossible?), do: "X", else: ""