From dd09f6fc58d0c5f45a5fd920722e63f7a493e220 Mon Sep 17 00:00:00 2001
From: Rebecca Le <rebecca@alembic.com.au>
Date: Wed, 4 Mar 2026 13:25:04 +0800
Subject: [PATCH] Add test for filtering on doubly-nested embedded resource
 fields

Adds `AshPostgres.Test.BioAddress` as a nested embedded resource within
`AshPostgres.Test.Bio`, and a regression test that filters `Author` records
by `bio[:address][:city]`.

This exercises the `get_path` code path for doubly-nested embedded resources,
which previously raised a `CaseClauseError` in `AshSql.Expr.split_at_paths/4`.
---
 test/embeddable_resource_test.exs     | 22 ++++++++++++++++++++++
 test/support/resources/bio.ex         |  2 ++
 test/support/resources/bio_address.ex | 18 ++++++++++++++++++
 3 files changed, 42 insertions(+)
 create mode 100644 test/support/resources/bio_address.ex

diff --git a/test/embeddable_resource_test.exs b/test/embeddable_resource_test.exs
index b987f90d..ead20aa8 100644
--- a/test/embeddable_resource_test.exs
+++ b/test/embeddable_resource_test.exs
@@ -23,6 +23,28 @@ defmodule AshPostgres.EmbeddableResourceTest do
              Ash.load!(post, :calc_returning_json)
   end
 
+  test "can filter on a doubly-nested embedded resource field" do
+    Author
+    |> Ash.Changeset.for_create(:create, %{
+      bio: %{address: %{city: "Sydney", country: "AU"}}
+    })
+    |> Ash.create!()
+
+    Author
+    |> Ash.Changeset.for_create(:create, %{
+      bio: %{address: %{city: "Melbourne", country: "AU"}}
+    })
+    |> Ash.create!()
+
+    results =
+      Author
+      |> Ash.Query.filter(bio[:address][:city] == "Sydney")
+      |> Ash.read!()
+
+    assert length(results) == 1
+    assert hd(results).bio.address.city == "Sydney"
+  end
+
   test "embeds with list attributes set to nil are loaded as nil" do
     author =
       Author
diff --git a/test/support/resources/bio.ex b/test/support/resources/bio.ex
index 0dce7e04..8d03b31e 100644
--- a/test/support/resources/bio.ex
+++ b/test/support/resources/bio.ex
@@ -22,5 +22,7 @@ defmodule AshPostgres.Test.Bio do
       allow_nil?(true)
       default(nil)
     end
+
+    attribute(:address, AshPostgres.Test.BioAddress, public?: true)
   end
 end
diff --git a/test/support/resources/bio_address.ex b/test/support/resources/bio_address.ex
new file mode 100644
index 00000000..30ce5425
--- /dev/null
+++ b/test/support/resources/bio_address.ex
@@ -0,0 +1,18 @@
+# SPDX-FileCopyrightText: 2019 ash_postgres contributors <https://github.com/ash-project/ash_postgres/graphs/contributors>
+#
+# SPDX-License-Identifier: MIT
+
+defmodule AshPostgres.Test.BioAddress do
+  @moduledoc false
+  use Ash.Resource, data_layer: :embedded
+
+  actions do
+    default_accept(:*)
+    defaults([:create, :read, :update, :destroy])
+  end
+
+  attributes do
+    attribute(:city, :string, public?: true)
+    attribute(:country, :string, public?: true)
+  end
+end