Refactor Record.child_release_groups/1 to use stored ids

lib/music_library/records/record.ex

@@ -57,9 +57,7 @@ defmodule MusicLibrary.Records.Record do
     record.musicbrainz_data
     |> Map.get("relations", [])
     |> Enum.filter(fn relation ->
-      relation["target-type"] == "release_group" and
+      relation["release_group"]["id"] in record.included_release_group_ids
-        relation["type"] == "included in" and
-        relation["direction"] == "backward"
     end)
     |> Enum.map(fn relation ->
       MusicBrainz.ReleaseGroup.from_api_response(relation["release_group"])

test/music_library/records/record_test.exs

@@ -1,6 +1,9 @@
 defmodule MusicLibrary.Records.RecordTest do
   use ExUnit.Case, async: true
 
+  import MusicLibrary.ReleaseGroupsFixtures
+  alias MusicLibrary.Records.Record
+
   defp get_current_date(_) do
     %{current_date: ~D[2025-01-01]}
   end
@@ -11,27 +14,82 @@ defmodule MusicLibrary.Records.RecordTest do
     test "returns true if the record has a release date in the past", %{
       current_date: current_date
     } do
-      record = %MusicLibrary.Records.Record{release: "2024-01-01"}
+      record = %Record{release: "2024-01-01"}
-      assert MusicLibrary.Records.Record.released?(record, current_date)
+      assert Record.released?(record, current_date)
     end
 
     test "returns false if the record has a release date in the future", %{
       current_date: current_date
     } do
-      record = %MusicLibrary.Records.Record{release: "2025-02-01"}
+      record = %Record{release: "2025-02-01"}
-      refute MusicLibrary.Records.Record.released?(record, current_date)
+      refute Record.released?(record, current_date)
     end
 
     test "returns true if the record is released today", %{current_date: current_date} do
-      record = %MusicLibrary.Records.Record{release: "2025-01-01"}
+      record = %Record{release: "2025-01-01"}
-      assert MusicLibrary.Records.Record.released?(record, current_date)
+      assert Record.released?(record, current_date)
     end
 
     test "it returns true if the release date is not precise enough", %{
       current_date: current_date
     } do
-      record = %MusicLibrary.Records.Record{release: "2019"}
+      record = %Record{release: "2019"}
-      assert MusicLibrary.Records.Record.released?(record, current_date)
+      assert Record.released?(record, current_date)
+    end
+  end
+
+  describe "child_release_groups/1" do
+    test "returns the release groups of children releases" do
+      release_group = release_group(:lockdown_trilogy)
+
+      record =
+        %Record{musicbrainz_data: release_group}
+        |> Record.update_included_release_group_ids()
+        |> Ecto.Changeset.apply_changes()
+
+      assert Record.child_release_groups(record) == [
+               %MusicBrainz.ReleaseGroup{
+                 id: "749c07b5-4900-404b-bea9-bb6b16fa991e",
+                 type: :other,
+                 title: "Claustrophobic Universe",
+                 release: "2021-04-23",
+                 artists: "Mariusz Duda"
+               },
+               %MusicBrainz.ReleaseGroup{
+                 id: "61077431-0057-4119-8f06-0df1098d21e5",
+                 type: :other,
+                 title: "Interior Drawings",
+                 release: "2021-12-10",
+                 artists: "Mariusz Duda"
+               },
+               %MusicBrainz.ReleaseGroup{
+                 id: "c36123e3-8899-48a5-8196-9dbb72421d69",
+                 type: :other,
+                 title: "Let’s Meet Outside",
+                 release: "2022-05-20",
+                 artists: "Mariusz Duda"
+               },
+               %MusicBrainz.ReleaseGroup{
+                 id: "d463f2b1-d254-4baf-a957-fb78c6e5b956",
+                 type: :other,
+                 title: "Lockdown Spaces",
+                 release: "2020-06-26",
+                 artists: "Mariusz Duda"
+               }
+             ]
+    end
+  end
+
+  describe "child_release_groups_count/1" do
+    test "returns the release groups count of children releases" do
+      release_group = release_group(:lockdown_trilogy)
+
+      record =
+        %Record{musicbrainz_data: release_group}
+        |> Record.update_included_release_group_ids()
+        |> Ecto.Changeset.apply_changes()
+
+      assert Record.child_release_groups_count(record) == 4
     end
   end
 end