Display count of child release groups

lib/music_library/records.ex

@@ -18,6 +18,7 @@ defmodule MusicLibrary.Records do
       :release,
       :genres,
       :musicbrainz_id,
+      :musicbrainz_data,
       :cover_hash
     ]
   end

lib/music_library/records/record.ex

@@ -15,7 +15,7 @@ defmodule MusicLibrary.Records.Record do
     field :cover_data, :binary
     field :cover_hash, :string
     field :musicbrainz_id, Ecto.UUID
-    field :musicbrainz_data, :map
+    field :musicbrainz_data, :map, default: %{}
     field :genres, {:array, :string}
     field :release, :string
     field :purchased_at, :utc_datetime
@@ -53,6 +53,26 @@ defmodule MusicLibrary.Records.Record do
     |> unique_constraint(:musicbrainz_id, name: "records_musicbrainz_id_format_index")
   end
 
+  def child_release_groups(record) do
+    record.musicbrainz_data
+    |> Map.get("relations", [])
+    |> Enum.filter(fn relation ->
+      relation["target-type"] == "release_group" and
+        relation["type"] == "included in" and
+        relation["direction"] == "backward"
+    end)
+  end
+
+  def child_release_groups_count(record) do
+    record.musicbrainz_data
+    |> Map.get("relations", [])
+    |> Enum.count(fn relation ->
+      relation["target-type"] == "release_group" and
+        relation["type"] == "included in" and
+        relation["direction"] == "backward"
+    end)
+  end
+
   @doc false
   def artist_changeset(artist, attrs) do
     artist

lib/music_library_web/live/record_live/index.html.heex

@@ -65,6 +65,12 @@
             · <%= Records.Record.format_long_label(record.format) %> · <%= Records.Record.type_long_label(
               record.type
             ) %>
+            <span :if={Records.Record.child_release_groups_count(record) > 0}>
+              ·
+              <span class="inline-flex items-center rounded-md bg-gray-50 px-2 py-1 text-xs font-medium text-gray-600 ring-1 ring-inset ring-gray-500/10">
+                <%= Records.Record.child_release_groups_count(record) %>
+              </span>
+            </span>
           </span>
         </p>
       </div>
@@ -75,6 +81,12 @@
           <%= Records.Record.format_long_label(record.format) %> · <%= Records.Record.type_long_label(
             record.type
           ) %>
+          <span :if={Records.Record.child_release_groups_count(record) > 0}>
+            ·
+            <span class="inline-flex items-center rounded-md bg-gray-50 px-2 py-1 text-xs font-medium text-gray-600 ring-1 ring-inset ring-gray-500/10">
+              <%= Records.Record.child_release_groups_count(record) %>
+            </span>
+          </span>
         </p>
       </div>
       <div class="relative flex-none">

lib/music_library_web/live/record_live/show.ex

@@ -26,11 +26,13 @@ defmodule MusicLibraryWeb.RecordLive.Show do
 
   @impl true
   def handle_params(%{"id" => id}, _, socket) do
+    record = Records.get_record!(id)
+
     {:noreply,
      socket
      |> assign(:nav_section, :records)
      |> assign(:page_title, page_title(socket.assigns.live_action))
-     |> assign(:record, Records.get_record!(id))}
+     |> assign(:record, record)}
   end
 
   @impl true